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Assam Agricultural University, Jorhat
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Assam Agricultural University is the first institution of its kind in the whole of North-Eastern Region of India. The main goal of this institution is to produce globally competitive human resources in farm sectorand to carry out research in both conventional and frontier areas for production optimization as well as to disseminate the generated technologies as public good for benefitting the food growers/produces and traders involved in the sector while emphasizing on sustainability, equity and overall food security at household level.
Genesis of AAU -
The embryo of the agricultural research in the state of Assam was formed as early as 1897 with the establishment of the Upper Shillong Experimental Farm (now in Meghalaya) just after about a decade of creation of the agricultural department in 1882. However, the seeds of agricultural research in today’s Assam were sown in the dawn of the twentieth century with the establishment of two Rice Experimental Stations, one at Karimganj in Barak valley in 1913 and the other at Titabor in Brahmaputra valley in 1923. Subsequent to these research stations, a number of research stations were established to conduct research on important crops, more specifically, jute, pulses, oilseeds etc. The Assam Agricultural University was established on April 1, 1969 under The Assam Agricultural University Act, 1968’ with the mandate of imparting farm education, conduct research in agriculture and allied sciences and to effectively disseminate technologies so generated. Before establishment of the University, there were altogether 17 research schemes/projects in the state under the Department of Agriculture. By July 1973, all the research projects and 10 experimental farms were transferred by the Government of Assam to the AAU which already inherited the College of Agriculture and its farm at Barbheta, Jorhat and College of Veterinary Sciences at Khanapara, Guwahati.
Subsequently, College of Community Science at Jorhat (1969), College of Fisheries at Raha (1988), Biswanath College of Agriculture at Biswanath Chariali (1988) and Lakhimpur College of Veterinary Science at Joyhing, North Lakhimpur (1988) were established. Presently, the University has three more colleges under its jurisdiction, viz., Sarat Chandra Singha College of Agriculture, Chapar, College of Horticulture, Nalbari & College of Sericulture, Titabar. Similarly, few more regional research stations at Shillongani, Diphu, Gossaigaon, Lakhimpur; and commodity research stations at Kahikuchi, Buralikson, Tinsukia, Kharua, Burnihat and Mandira were added to generate location and crop specific agricultural production packages.
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ThesisItem Open Access INTEGRATED NUTRIENT MANAGEMENT IN YELLOW SARSON - GREENGRAM CROPPING SYSTEM UNDER RAINFED CONDITION(2016) Gogoi, Bebi; Ojha, N. J.A field experiment entitled “Integrated nutrient management in yellow sarson - greengram cropping system under rainfed condition” was carried out at the Instructional-cum-Research farm of Assam Agricultural University, Jorhat during two consecutive rabi (Oct-Feb) followed by summer (Feb-May) seasons of the year 2017- 2018 and 2018-2019. The experiment was laid out in randomized block design for first crop and split plot design for second crop with three replications. The eight INM practices viz., 100% RDF (60-30-30 kg/ha N-P2O5-K2O) (Y1), 100% RDF + biofertilizer consortium (Y2), 75% RDF + 25% N through vermicompost (Y3), 75% RDF + 25% N through vermicompost + biofertilizer consortium (Y4), 50% RDF + 50% N through vermicompost (Y5), 50% RDF + 50% N through vermicompost + biofertilizer consortium (Y6), 25% RDF + 75% N through vermicompost (Y7) and 25% RDF + 75% N through vermicompost + biofertilizer consortium (Y8) were applied to yellow sarson crop. In greengram crop the residual effect of the treatments applied to yellow sarson were allotted in main plots and two different integrated nutrient management practices viz., 100% RDF + biofertilizer consortium (G1) and 50% RDF + biofertilizer consortium (G2) in the sub plots. The soil of the experimental site was sandy loam in texture, acidic in reaction (pH 5.40 and 5.56), medium in organic carbon (0.69 and 0.72%), available N (274.86 and 290.75 kg/ha), available K2O (138.16 and 140.89 kg/ha) and low in available P2O5 (17.90 and 20.30 kg/ha) in the year 2017-18 and 2018-19, respectively. Experimental findings revealed that application of 75% RDF + 25% N through vermicompost + biofertilizer consortium (Y4) resulted in significantly higher growth as well as yield attributing characters like plant height, number of branches per plant, dry matter accumulation, crop growth rate, relative growth rate, number of siliquae per plant, length of siliqua, number of seeds per siliqua in both the years. The highest seed yield of 998.34, 1026.22 and 1012.28 kg/ha, stover yield of 2393.97, 2420.65 and 2407.31 kg/ha during 2017-18, 2018-19 and in pooled analysis, respectively, were recorded with treatment having 75% RDF + 25% N through vermicompost + biofertilizer consortium (Y4). The seed oil content of 36.40 and 36.97% and seed protein content of 13.27 and 13.44% were also recorded in Y4 in 1st and 2nd year, respectively. Similar effects of this treatment were also observed in respect of N, P and K content and uptake by both seed and stover. However, soil microbial population, microbial biomass carbon, phosphomonoesterase activity and fluorescein di-acetate hydrolase activity after harvest of yellow sarson were significantly higher in treatment having 25% RDF + 75% N through vermicompost + biofertilizer consortium (Y8). The crop recorded the highest gross return (` 56105 in 2017-18 and ` 57652 in 2018-19), net return (` 35407 during 2017-18 and ` 36954 during 2018-19) and benefit-cost ratio (2.71 during 2017-18 and 2.79 during 2018-19) with the treatment containing 75% RDF + 25% N through vermicompost + biofertilizer consortium (Y4). 7 In case of greengram, residual effect of 25% RDF + 75% N through vermicompost + biofertilizer consortium (Y8) resulted in significantly higher growth as well as yield attributing characters like plant height, number of branches per plant, dry matter accumulation, crop growth rate, number of pods per plant and number of seeds per pod in both the years. The effect of these was reflected in higher seed yield (849.56, 806.56 and 828.06 kg/ha in the year 2018, 2019 and in pooled analysis, respectively) and stover yield (2012.68, 1935.58 and 1974.13 kg/ha in 2018, 2019 and in pooled analysis, respectively) under the same integrated nutrient management practices. The maximum values of N, P and K uptake by seed and stover, soil microbial population, microbial biomass carbon, phosphomonoesterase activity and fluorescein di-acetate hydrolase activity after harvest of greengram were also observed under this treatment (Y8). However,direct application of 100% RDF + biofertilizer consortium (G1) brought about higher values in growth parameters, yield attributes, yield of seed (804.21, 724.68 and 764.45 kg/ha during 2018, 2019 and in pooled analysis, respectively) and stover yield (1830.89, 1763.80 and 1797.35 kg/ha during 2018, 2019 and in pooled analysis, respectively), protein content in seed (22.39 and 22.26% in 2018 and 2019 respectively), content and uptake of N, P and K by both seed and stover, soil microbial population, microbial biomass carbon, phosphomonoesterase activity and fluorescein diacetate hydrolase activity after harvest of greengram over 50% RDF + biofertilizer consortium (G2). The highest gross return (` 50726 in 2018 and ` 48922 in 2019), net return (` 33611 during 2018 and ` 31807 during 2019) and benefit-cost ratio (2.96 during 2018 and 2.86 during 2019) were observed under treatment Y8G1 containing 100% RDF + biofertilizer consortium (G1) + residue of treatment Y8 (25% RDF + 75% N through vermicompost + biofertilizer consortium). In regards to yellow sarson-greengram cropping system the highest yellow sarson equivalent yield (1678.57 and 1614.02 kg/ha in 2018 and 2019, respectively) were obtained by treatment Y4G1 containing 100% RDF + biofertilizer consortium (G1) + residue of treatment Y4 (75% RDF + 25% N through vermicompost + biofertilizer consortium). The highest gross return (` 93518 in 2017-18 and ` 89981 in 2018-19), net return (` 55705 during 2017-18 and ` 52168 during 2018-19) and benefit-cost ratio (2.47 during 2017-18 and 2.37 during 2018-19) of yellow sarsongreengram cropping system were observed under treatment Y4G1, containing 100% RDF + biofertilizer consortium (G1) + residue of treatment Y4 (75% RDF + 25% N through vermicompost + biofertilizer consortium). The performance of yellow sarsongreengram cropping system was assessed on the basis of yellow sarson equivalent yield, net monetary returns and B-C ratio. The application of 75% RDF + 25% N through vermicompost + biofertilizer consortium to yellow sarson and 100% RDF + biofertilizer consortium to greengram was the most beneficial combination compared to rest of the treatments.ThesisItem Unknown EVALUATION OF PANCHAGAVYA AS ORGANIC INPUT FOR LATE SOWN RAPESEED PRODUCTION(AAU, Jorhat, 2021) DAS, NILAKHI; Goswami, JogeshA field experiment entitled “Evaluation of panchagavya as organic input for late sown rapeseed production” was conducted at the organic block of the Instructional-cum-Research (ICR) Farm, Assam Agricultural University, Jorhat during rabi season of the year 2020- 2021 to evaluate the effects of panchagavya on growth, yield and economics of late sown rapeseed as well as their overall impact on soil health. The experiment was laid out in Randomised Block Design with three replications. The experiment consisted of eight treatments viz.,T1: control (no organic input )), T 2 : RDN through vermicompost , T 3 : Vedic panchagavya soil application (3%), T 4 : 1 tonne VC/ha as basal + Vedic panchagavya foliar application (3%), T 5 : e nriched panchagavya soil application (3%), T 6 : e nriched panchagavya foliar application ( 3%), T 7 : Vedic panchagavya basal application (1.5%) + Vedic panchagavya foliar application (1.5%), T 8 : e nriched panchagavya basal application (1.5%)+ enriched panchagavya folia r application ( 1.5%). The soil of the site where experiment was carried out was sandy loam in texture, acidic in reaction. The soil of experimental site was medium in organic carbon (0.48 %), medium in av ailable N, P 2 O 5 and K 2 O (268.86, 21.87 and 172 .82 kg/ha , respectively The crop was sown on 9 December, 2020 and harvested on 19 March, 2021. The crop took average duration of 101 days during experimentation. Experimental findings revealed that different treatments significantly influenced bo th growth and yield attributing characters of late sown rapeseed. Maximum values of growth parameters were recorded in 1tonne VC/ha as basal + Vedic panchagavya FA (3%) treatment (T 4 ). Maximum values of yield parameters were also observed under 1tonne VC/h a as basal + Vedic panchagavya FA (3%) treatment. The highest seed yield (6.89q/ha) and stover yield (20.48 q/ha) were recorded in this treatment (T 4 ). The highest oil yield (258.91 kg/ha) of rapeseed and also increased nutrient content and up take were recorded with application of 1tonne VC/ha as basal + Vedic panchagavya FA (3%) 3%). The better chemical properties of the soil after harvesting was recorded in RDN through VC (T 2 ) treatment but better biological properties viz ., microbial population i.e., bacteria ( 26.12 x 10 7 cfu/g of soil ) and fungi ( 29.89 x 10 4 cfu/g of soil) and dehydrogenase activity (9.48 µg TPF/g/24 hrs were recorded under treatment T 4 The economic study revealed that the highest gross return (Rs. 55120/ha) was observed in 1 tonne VC/ha as basal + Vedic panchagavya foliar application (3%) (T 4 ) treatment. But the maximum net return (Rs. 34020/ha) and B:C ratio (1.90) were recorded in enriched panchagavya foliar application ( (T 6 From t his study, it can be concluded that the Vedic panchagavya @ 3% as foliar application along with 1 ton ne of VC/ha as basa l (T 4 ) under late sown condition was found to be the best among all the treatments in terms of growth and yield attributes as well as yield of the rapeseed var. TS 67 But, foliar application of enriched panchagavya @ 3% (T 6 ) was identified as profitable among all the treatments with the highest B:C ratio o f 1.90.ThesisItem Unknown Effect of tillage and weed control methods on growth and yield of kharif sesamum (Sesamum indicum L.) under upland situation(AAU, Jorhat, 2021) Nath, Mrinmoy Jyoti; Bayan, H C.A field experiment entitled “Effect of tillage and weed control methods on growth and yield of kharif sesamum (Sesamum indicum L.) under upland situation” was carried out during kharif, 2020 at P.G. Experimental Field, Department of Agronomy, B.N. College of Agriculture, AAU, Biswanath Chariali with the objectives of (i) Assess the effect of tillage and weed control methods on weed population and growth in kharif sesamum (ii) Evaluate the effect of different treatments on growth and yield of kharif sesamum and (iii) Suggest an effective weed control method(s) for kharif sesamum. The experiment was laid out in a split-plot design with two tillage operations (Zero tillage and Conventional tillage) as main plot treatment and six weed control methods viz., manual weeding twice at 20 DAS and 40 DAS; Quizalofop-p-ethyl 5% EC @ 0.05 kg a.i. ha-1 at 20 DAS; Imazethapyr 10% SL @ 0.075 kg a.i. ha-1 at 20 DAS; Quizalofop-p-ethyl 5% EC @ 0.05 kg a.i. ha-1 at 20 DAS + Rotary weeding at 40 DAS; Imazethapyr 10% SL @ 0.075 kg a.i. ha-1 at 20 DAS + Rotary weeding at 40 DAS and unweeded (control) as sub-plot treatment, replicated thrice. The results of the present investigation revealed that, the conventional tillage significantly suppressed weed dry weight at 20 and 40 DAS and resulted in marked increase of weed control efficiency at 40 DAS. Conventional tillage also recorded comparatively lower weed density (at all crop growth stages); lower weed dry weight (60 DAS and at harvest) and higher weed control efficiency (60 DAS and at harvest) over zero tillage. Significantly higher plant dry weight, initial crop growth rate, and capsules plant-1 were recorded under conventional tillage and resulted in significant increased of seed yield (823.58 kg ha-1), stover yield (3118.29 kg ha-1), harvest index (26.58%) and gross return (Rs 52,408 ha-1). However, comparatively higher B:C was recorded in zero tillage over conventional tillage. Weed control methods had significant effect on reducing the weed densityand weed dry weight at all the crop growth stages except at 20 DAS and resulted in increased weed control efficiency. Among the weed control methods, manual weeding twice recorded significantly lowest weed density, weed dry weight and better weed control efficiency over unweeded (control). Weed control methods also had significant effect on crop growth and yield attributing characters of sesamum. Among the weed control methods, manual weeding twice recorded significantly higher seed yield (1263.61 kg ha-1), stover yield (3647.86 kg ha-1), harvest index (30.40%) and B:C (2.67) and unweeded (control) recorded lowest seed yield (454.72 kg ha-1), stover yield (2717.61 kg ha-1) and B:C (1.39) in kharif sesamum. Cultivation of kharif sesamum under conventional tillage and weed suppression by manual weeding twice at 20 and 40 DAS can be judged as the best methods studied on the basis of better weed suppression, crop yield and economic indices.ThesisItem Unknown EFFECT OF SOWING DATES AND SEED PRIMING ON GROWTH AND YIELD OF RAPESEED UNDER RAINFED CONDITION(AAU, Jorhat, 2021) Shreera, Hidangmayum; Sarma, DigambarA field experiment entitled “Effect of sowing dates and seed priming on growth and yield of rapeseed under rainfed condition” was conducted during rabi, 2020-21 at the PG Experimental Field of the Department of Agronomy, BNCA. The objectives of the experiment were (i) To find out the effect of sowing dates and seed priming on growth parameters of rapeseed and (ii) To study the effect of different treatments on yield and yield attributes of rapeseed. The treatments consisted of 3 levels of dates of sowing viz., 30th October (D1), 15th November (D2) and 1st December (D3) and 5 levels of seed priming methods viz., Farmer’s practice (S0), Water soaked for 10hrs (S1), Potassium chloride (KCl) @ 2% for 10hrs (S2), Sodium chloride (NaCl) @ 1% for 8hrs (S3) and Potassium dihydrogen phosphate (KH2PO4) @ 1% for 10hrs (S4) with three replications. The soil of the experimental site was acidic (pH 4.64), sandy loam in texture, medium in organic carbon content (0.64%), low in available N (232.06 kg ha-1), P2O5 (21.65kg ha-1) and K2O (113.20 kg ha-1) having a bulk density of 1.42 (g cm-3). The results revealed that sowing of the crop at different dates and different seed priming techniques had significant effect on most of the growth and yield attributes viz., emergence percentage, plant height, stem dry weight, leaf dry weight, reproductive dry weight, total dry weight, leaf per plant, leaf area per plant, LAI, CGR, RGR, number of primary branches per plant, total chlorophyll content, plant population, siliqua per plant, seeds per siliqua, seed yield per plant, seed yield, stover yield and HI. There was significant increase in the plant height, dry matter accumulation, no. of leaves, leaf area, LAI, CGR, RGR from 30DAS to harvest. However, dates of sowing did not show any significant effect on RGR at 60DAS. Moreover, both dates of sowing and seed priming did not show any significant effect on test weight. Among the different dates of sowing the crops sown on 15th November recorded the highest seed yield and harvest index (8.93 q ha-1 and 44.03 %respectively) which was statistically superior over the crop sown on 1st December. Similarly, among the seed priming methods the crops primed with KCl 2% for 10hrs showed highest seed yield (9.96 q ha-1) and harvest index (44.49 %). The highest gross return (Rs 40,188 /ha), net return (Rs 20,210 /ha) and B:C ratio (2.01) was recorded from the crop sown on 15th November (D2). Different seed priming methods recorded significantly higher values for KCl @ 2% for 10 hrs priming (S2) with highest gross return (Rs 44,830 /ha), net return (Rs 24,835/ha) and B:C ratio (2.24). Interaction between sowing dates and seed priming showed significant differences in the economic parameters. 15th November sowing with KCl @ 2% for 10 hrs priming (D2S2) resulted in highest gross return (Rs 53,310 /ha), net return (Rs 33,315/ha) and B:C ratio (2.67). From the findings of the present experiment, it can be concluded that sowing of rapeseed on 15th November and seed priming with KCl @ 2% for 10 hrs can be suggested for higher productivity of the crop and better profitability to the farmers.ThesisItem Unknown EFFECT OF SEED PRIMING AND MOISTURE CONSERVATION MEASURES ON PRODUCTIVITY AND PROFITABILITY OF BABY CORN(Zea mays L.) UNDER RAINFED UPLAND SITUATION(AAU, Jorhat, 2021) Goswami, Himashree; kalita, JayantaA field experiment was conducted during rabi, 2020-21 at the PG experimental plot of the department of agronomy, BNCA to assess seed priming and moisture conservation measures on babycorn under rainfed situation for productivity and profitability. The soil of the experimental site was acidic (pH 4.64), sandy loam in texture, medium in organic carbon (0.64%), low in available N (232.06 kg ha-1), P2O5 (13.84 kg ha-1)and K2O (115.27 kg ha-1). The treatments consist of 4 levels of seed priming technologies viz. S0: No priming; S1: Seed priming with 1% urea solution; S2: priming with 1% potash solution (MOP); S3: priming with 3 times diluted cow urine and 3 levels of soil moisture conservation measures viz. M0: No mulching; M1: use of bio mulch; M2: use of black polythene mulch replicated three times in factorial randomized block design. Results revealed that the performance of different seed priming methods in seedling emergence of babycorn crop was significant upto 6 days after sowing but different moisture conservation measures could not bring any significant effect in the field emergence of babycorn seedlings. The highest and quick seedling emergence (11.96 numbers m-2) was recorded under the treatment of seed priming with three times diluted cow urine which was at par with the treatment of seed priming with 1% urea solution and 1% KCl (MOP) solution. Different growth, yield attributing characters and yield of babycorn were also significantly affected due to moisture conservation measures but seed priming methods could not bring any significant effect on growth and yield parameters. The total number of leaves m-2 , total leaf area plant-1 and leaf area index (LAI) of babycorn were also changed significantly due to different moisture conservation measures but those parameters remain static due to different seed priming methods. The CGR (g m-2 day-1), RGR, (g g-1 day-1) and NAR (mg cm-1 day-1) of babycorn were also changed significantly due to different soil moisture conservation measures. The highest and significant babycorn yield without husk(22.59 q ha-1) with 305.61 q ha-1 of green fodder yield were recorded under the treatment where black polythene mulching was used as soil moisture conservation measure. The significantly highest harvest index (6.00), production efficiency (25.67 kg-1 Day-1 ha-1) and nutrient use productivity (9.41 kg-1 ha-1 kg-1) were recorded under the treatment of moisture conservation by using black polythene mulching. Different seed priming methods and soil moisture conservation measures could not bring any significant effect on the post crop soil reaction and organic carbon content in soil but the NPK status of soil after harvest of babycorn were significantly affected by different soil moisture conservation measures. The highest gross return (Rs. 372782 ha-1), net return (Rs. 213372 ha-1), B:C (2.34) ratio and economic efficiency (Rs. 2425ha-1 Day-1) were recorded superior where seeds were primed with 1% potash (MOP) solution and black polythene mulch recorded a gross return(Rs. 399972 ha-1), net return (Rs. 231132 ha-1), B:C (2.37) ratio and economic efficiency (Rs. 2627ha-1 Day-1). From the present investigation, it can be concluded that the babycorn crop can be grown for higher productivity and profitably by following seed priming with 1% urea, 1% potash (MOP) solution or 3 times diluted cow urine for eight hours alongwith black polythene mulching as soil moisture conservation measure.ThesisItem Unknown DRIP FERTIGATION IN BROCCOLI (Brassica oleracia var. italica)(AAU, Jorhat, 2021) Kalita, Pujashree; Thakuria, R KA field experiment was conducted at Instructional-cum-Research Farm, Assam Agricultural University, Jorhat in rabi season of 2019–20 and 2020–21 to study the “Drip fertigation in broccoli (Brassica oleracia var. italica)”. The experiment consisted of 4 drip irrigation levels viz., I1: 1.20 ETc (120% ETc), I2: 1.00 ETc (100% ETc), I3: 0.80 ETc (80% ETc) and I4: 0.60 ETc (60% ETc) and 4 fertilizer levels applied as drip fertigation viz., F1: 100% RD of N, P and K, F2: 75% RD of N, P and K, F3: 50% RD of N, P and K and F4: No fertilizer (control). The experiment was laid out in Factorial Randomized Block Design (FRBD) with 3 replications. The soil of the experimental site was sandy loam in texture, moderately acidic in reaction, medium in organic carbon, nitrogen, phosphorus and potassium content. The broccoli hybrid ‘Green Magic’ was transplanted on 18 and 21 December in 2019 and 2020, respectively. The crop was harvested from 09–21 March 2020 and 15–24 March 2021, respectively. The results revealed that irrigation level I1: 1.20 ETc recorded significantly higher growth and yield parameters like plant height, number of leaves per plant, plant spread, head yield, biological yield, total head yield and harvest index, however, it was at par with treatment I2: 1.0 ETc in both the years of study and in pooled. However, the days to head initiation and maturity and IWUE were highest with I4: 0.6 ETc and stalk diameter and head diameter was recorded highest with I2: 1.0 ETc which was at par with treatment I1:1.20 ETc. Drip irrigation at 120% ETc (I1) recorded the highest plant water content and relative leaf water content at all the growth stages during both the years of experimentation. The highest values of N, P, K content and uptake in head, stem and leaves along with total uptake by plant, available N, P2O5 and K2O content in soil after harvest were recorded with I1: 1.20 ETc which was also at par with the treatment I2: 1.0 ETc. In pooled analysis, similar trend was observed. Fertility level F1: 100% RD of NPK and F2: 75% RD of NPK through drip was found at par with each other during both the years of study. The pooled data of Fertility level F1 also recorded the highest growth and yield attributes along with the highest N, P, K content and uptake in head, stem and leaves and total uptake by the plant accompanied by the highest available N, P2O5 and K2O content in soil after harvest of the crop. The two years study on different levels of drip irrigation and fertilizer was capable to show significant response on growth and yield of broccoli. Drip irrigation at 120% ETc with 100% RD of NPK showed the maximum net return (Rs. 392606) and B:C (4.95) followed by drip irrigation at 100 % ETc + 75% RD of NPK with respective values of Rs. 295286 and 4.01. Thus, resource conservation (water and fertilizer) point of view, drip irrigation at 100 % ETc in combination with 75% RD of NPK may be considered optimum for broccoli crop in Assam.ThesisItem Unknown MANAGEMENT OF POTASSIUM IN ORGANIC BLACK RICE UNDER SYSTEM OF RICE INTENSIFICATION(2021) Dambale, Ashok Sambhaji; Goswami, J.A field experiment entitled “Management of potassium in organic black rice under system of rice intensification” was conducted at the organic block, Instructionalcum- Research Farm of Assam Agricultural University, Jorhat during kharif seasons, 2019 and 2020 to evaluate the effect of different organic inputs on growth, yield, quality and economics of organic black rice along with cumulative effects on soil health under the system of rice intensification (SRI).The experiment consisted of twelve different treatments viz.,Control (T1), Potash solubilizing bacteria (KSB) @ 3.5 kg ha-1 as root dip treatment (T2), RDK through azolla incorporation (T3), RDK through water hyacinth incorporation (T4), RDK through banana pseudo stem vermicompost (T5), RDK through azolla incorporation + mustard oil cake @ 20 kg ha-1 (T6), RDK through water hyacinth incorporation + mustard oil cake @ 20 kg ha-1 (T7), RDK through banana pseudo stem vermicompost + mustard oil cake @ 20 kg ha-1 (T8), RDK through azolla incorporation + Potash solubilizing bacteria (KSB) @ 3.5 kg ha-1 as rood dip treatment (T9), RDK through water hyacinth incorporation + Potash solubilizing bacteria (KSB) @ 3.5 kg ha-1 (T10), RDK through banana pseudo stem vermicompost + Potash solubilizing bacteria (KSB) @ 3.5 kg ha-1(T11), Indigenous traditional knowledge (T12). The experiment was laid out in a Randomized Block Design (RBD) with three replications. The soil of the experimental site was sandy loam in texture with pH 5.28, organic carbon (0.72 %), CEC {6.58c mole (p+)/ kg}, low in available nitrogen (246.45 kg ha-1) and available P2O 5 (21.02 kg ha-1) but medium in available K2O (144.80 kg ha-1). The total rainfall received during the crop season was 928.2 mm with 43 rainy days in 2019 and 1272.10 mm with 69 rainy days in 2020. The mean maximum and minimum temperature during the whole crop growing period ranged from 30.6 to 21.3°C during 2019 and 32.09 to 24.28 °C during 2020, respectively. The growth, yield attributes and yield of organic black rice was significantly influenced by different K management practices. Among the different growth parameters viz., leaf area index, no. of leaves, root dry weight, shoot dry weight, root: shoot ratio, root length, root volume, no. of tillers and dry matter accumulation except plant height at different stages were observed to be significantly higher with the application of RDK through banana pseudo stem vermicompost + mustard oil cake @ 20 kg ha-1 i.e. treatment T8, while the lowest values were recorded under the control treatment T1.In case of yield and yield attributing characters like, no. of panicles m-2 , panicle length, panicle weight, no. of filled and unfilled grains and test weight were found to be superior in respect of almost all the studied parameters under the treatment T8. The highest no. of panicles (m-2) 294.10, 305.20, panicle length 27.49 (cm), 28.87 (cm), panicle weight 4.87 (g), 4.89 (g), no. of filled grains panicle-1 pooled 214.53, no. of unfilled grains panicle-1 pooled 26.73 and test weight 24.48 (g) 24.56 (g), respectively during 2019 and 2020 were also found highest with treatment T8. The highest pooled grain (24.52 q ha-1), straw (46.07 q ha-1) and biological yield (70.59 q ha-1) were registered with the treatment T8 i.e. RDK through banana pseudo stem vermicompost + mustard oil cake @ 20 kg ha-1. The quality parameters of black rice were also significantly influenced by different K management practices. The quality parameter includes length and breadth of kernel, L/B ratio, protein content and milling qualities. The maximum quality parameters were found highest under treatment T8 (RDK through banana pseudo stem vermicompost along with 20 kg of mustard oil cake) followed by T6 (RDK through azolla incorporation along with mustard oil cake @ 20 kg ha-1) except protein content where as highest protein content (7.96 during 2019 and 7.98 % during 2020) was found under treatment T6 (RDK through azolla incorporation + mustard oil cake @ 20 kg ha-1) followed by T9 (RDK through azolla incorporation along with Potash solubilizing bacteria @ 3.5 kg ha-1). The N, P and K contents and total uptake by grain and straw were significantly influenced by different K management practices. The highest uptake of N (65.74 kg ha1) was found in T6, P (11.4 kg ha-1) and K (39.56 kg ha-1) were found in T8 respectively. The influence of different organic inputs on available N, P2O5 and K2O in soil after harvesting was found significant. The highest pooled value of available N was recorded with T6 treatment i.e. RDK through azolla incorporation + mustard oil cake @ 20 kg ha-1and in case of P2O5 and K2O the highest pooled values recorded under T8 treatment i.e. 43.07 kg ha-1, 159.86 kg ha-1 respectively. The soil biological properties and enzymatic activities of black rice cultivated soil were significantly influenced by different organic inputs. The higher values of soil microbial biomass carbon (642.77 μg/g dry soil during 2019 and 687.44 μg/g dry soil during 2020, Bacteria population (7.12 log cfu/g soil during 2019 and 7.18log cfu/g soil during 2020, fungal population (4.86 log cfu/g soil during 2019 and 4.89 log cfu/g soil during 2020 , dehydrogenase activity (67.19 μg TPF/g/day during 2019 and 69.52 μg TPF/g/day during 2020) and Phosphomonoesterase activity (78.61(μg PNP/g/hr 2019 and 79.48 μg PNP/g/hr during 2020 were reported with application of RDK through banana pseudo stem vermicompost along with mustard oil cake @ 20 kg ha-1 (T8) followed by application of RDK through azolla incorporation along with mustard oil cake @ 20 kg ha-1 (T6). In the present investigation, the gross monetary return (`.127136), net monetary return (`.79136) and B:C ratio (2.65) were found to be highest under T8 treatment i.e. RDK through banana pseudo stem vermicompost + mustard oil cake @ 20 kg ha-1 and the lowest were recorded under T1 treatment. Based on the findings of two years study on management of potassium in organic black rice under system of rice intensification, it may be concluded that among all treatments T8 (RDK through banana pseudo stem vermicompost + mustard oil cake @ 20 kg ha-1) was found best closely followed by treatment T6 (RDK through azolla incorporation along with mustard oil cake @ 20 kg ha-1) with respect to reap good economic yield with better quality, sustain the soil health and high net return and were found beneficial as potash source to substitute recommended dose of potassium in organic cultivation of black rice under agro-ecological situation of Assam.ThesisItem Unknown MANAGEMENT OF POTASSIUM IN ORGANIC BLACK RICE UNDER SYSTEM OF RICE INTENSIFICATION(AAU, Jorhat, 2021) Dambale, Ashok Sambhaji; Goswami, JA field experiment entitled “Management of potassium in organic black rice under system of rice intensification” was conducted at the organic block, Instructionalcum- Research Farm of Assam Agricultural University, Jorhat during kharif seasons, 2019 and 2020 to evaluate the effect of different organic inputs on growth, yield, quality and economics of organic black rice along with cumulative effects on soil health under the system of rice intensification (SRI).The experiment consisted of twelve different treatments viz.,Control (T1), Potash solubilizing bacteria (KSB) @ 3.5 kg ha-1 as root dip treatment (T2), RDK through azolla incorporation (T3), RDK through water hyacinth incorporation (T4), RDK through banana pseudo stem vermicompost (T5), RDK through azolla incorporation + mustard oil cake @ 20 kg ha-1 (T6), RDK through water hyacinth incorporation + mustard oil cake @ 20 kg ha-1 (T7), RDK through banana pseudo stem vermicompost + mustard oil cake @ 20 kg ha-1 (T8), RDK through azolla incorporation + Potash solubilizing bacteria (KSB) @ 3.5 kg ha-1 as rood dip treatment (T9), RDK through water hyacinth incorporation + Potash solubilizing bacteria (KSB) @ 3.5 kg ha-1 (T10), RDK through banana pseudo stem vermicompost + Potash solubilizing bacteria (KSB) @ 3.5 kg ha-1(T11), Indigenous traditional knowledge (T12). The experiment was laid out in a Randomized Block Design (RBD) with three replications. The soil of the experimental site was sandy loam in texture with pH 5.28, organic carbon (0.72 %), CEC {6.58c mole (p+)/ kg}, low in available nitrogen (246.45 kg ha-1) and available P2O 5 (21.02 kg ha-1) but medium in available K2O (144.80 kg ha-1). The total rainfall received during the crop season was 928.2 mm with 43 rainy days in 2019 and 1272.10 mm with 69 rainy days in 2020. The mean maximum and minimum temperature during the whole crop growing period ranged from 30.6 to 21.3°C during 2019 and 32.09 to 24.28 °C during 2020, respectively. The growth, yield attributes and yield of organic black rice was significantly influenced by different K management practices. Among the different growth parameters viz., leaf area index, no. of leaves, root dry weight, shoot dry weight, root: shoot ratio, root length, root volume, no. of tillers and dry matter accumulation except plant height at different stages were observed to be significantly higher with the application of RDK through banana pseudo stem vermicompost + mustard oil cake @ 20 kg ha-1 i.e. treatment T8, while the lowest values were recorded under the control treatment T1.In case of yield and yield attributing characters like, no. of panicles m-2 , panicle length, panicle weight, no. of filled and unfilled grains and test weight were found to be superior in respect of almost all the studied parameters under the treatment T8. The highest no. of panicles (m-2) 294.10, 305.20, panicle length 27.49 (cm), 28.87 (cm), panicle weight 4.87 (g), 4.89 (g), no. of filled grains panicle-1 pooled 214.53, no. of unfilled grains panicle-1 pooled 26.73 and test weight 24.48 (g) 24.56 (g), respectively during 2019 and 2020 were also found highest with treatment T8. The highest pooled grain (24.52 q ha-1), straw (46.07 q ha-1) and biological yield (70.59 q ha-1) were registered with the treatment T8 i.e. RDK through banana pseudo stem vermicompost + mustard oil cake @ 20 kg ha-1. The quality parameters of black rice were also significantly influenced by different K management practices. The quality parameter includes length and breadth of kernel, L/B ratio, protein content and milling qualities. The maximum quality parameters were found highest under treatment T8 (RDK through banana pseudo stem vermicompost along with 20 kg of mustard oil cake) followed by T6 (RDK through azolla incorporation along with mustard oil cake @ 20 kg ha-1) except protein content where as highest protein content (7.96 during 2019 and 7.98 % during 2020) was found under treatment T6 (RDK through azolla incorporation + mustard oil cake @ 20 kg ha-1) followed by T9 (RDK through azolla incorporation along with Potash solubilizing bacteria @ 3.5 kg ha-1). The N, P and K contents and total uptake by grain and straw were significantly influenced by different K management practices. The highest uptake of N (65.74 kg ha1) was found in T6, P (11.4 kg ha-1) and K (39.56 kg ha-1) were found in T8 respectively. The influence of different organic inputs on available N, P2O5 and K2O in soil after harvesting was found significant. The highest pooled value of available N was recorded with T6 treatment i.e. RDK through azolla incorporation + mustard oil cake @ 20 kg ha-1and in case of P2O5 and K2O the highest pooled values recorded under T8 treatment i.e. 43.07 kg ha-1, 159.86 kg ha-1 respectively. The soil biological properties and enzymatic activities of black rice cultivated soil were significantly influenced by different organic inputs. The higher values of soil microbial biomass carbon (642.77 μg/g dry soil during 2019 and 687.44 μg/g dry soil during 2020, Bacteria population (7.12 log cfu/g soil during 2019 and 7.18log cfu/g soil during 2020, fungal population (4.86 log cfu/g soil during 2019 and 4.89 log cfu/g soil during 2020 , dehydrogenase activity (67.19 μg TPF/g/day during 2019 and 69.52 μg TPF/g/day during 2020) and Phosphomonoesterase activity (78.61(μg PNP/g/hr 2019 and 79.48 μg PNP/g/hr during 2020 were reported with application of RDK through banana pseudo stem vermicompost along with mustard oil cake @ 20 kg ha-1 (T8) followed by application of RDK through azolla incorporation along with mustard oil cake @ 20 kg ha-1 (T6). In the present investigation, the gross monetary return (`.127136), net monetary return (`.79136) and B:C ratio (2.65) were found to be highest under T8 treatment i.e. RDK through banana pseudo stem vermicompost + mustard oil cake @ 20 kg ha-1 and the lowest were recorded under T1 treatment. Based on the findings of two years study on management of potassium in organic black rice under system of rice intensification, it may be concluded that among all treatments T8 (RDK through banana pseudo stem vermicompost + mustard oil cake @ 20 kg ha-1) was found best closely followed by treatment T6 (RDK through azolla incorporation along with mustard oil cake @ 20 kg ha-1) with respect to reap good economic yield with better quality, sustain the soil health and high net return and were found beneficial as potash source to substitute recommended dose of potassium in organic cultivation of black rice under agro-ecological situation of Assam.ThesisItem Open Access INTERCROPPING OF QUALITY PROTEIN MAIZE AND TORIA UNDER DIFFERENT NUTRIENT LEVELS AND PLANTING DENSITY(AAU, Jorhat, 2021) SARMA, MEGHNA; Kurmi, K.A field experiment “Intercropping of quality protein maize and toria under different nutrient levels and planting density” was conducted at the Instructionalcum- Research Farm of AAU, Jorhat during the rabi season of 2017-18 and 2018- 19.The soil of the experimental site was sandy loam in texture with acidic in reaction (pH 5.34), medium in organic carbon (0.61%), medium in available nitrogen (308.65kg ha-1), high in available phosphorus (35.59 kg ha-1) and medium in available potassium (198.54 kg ha-1). The experiment was laid out in factorial RBD with 3 replications. The treatment consisted of three fertility levels (F1:60-40-40 kg ha-1 N-P2O5-K2O, F2:90-60- 60 kg ha-1 N-P2O5-K2O and F3:120-80-80 kg ha-1 N-P2O5-K2O), three paired row spacing (S1:55cm x 25cm, S2:65cm x 25cm, S3:75cm x 25 cm) with two methods of sowing (P0: Normal sowing, P1: Paired row sowing). Maize variety Vivek QPM-9 and toria variety Jeuti (JT-90-1) were selected for maize + toria intercropping. Experimental findings revealed that among different fertilizer levels, 120-80-80 kg ha-1 N, P2O5 and K2O (F3) differed significantly with respect to growth parameters of quality protein maize like plant height, number of leaves per plant, dry matter accumulation, crop growth rate, leaf area index during both the years of experimentation. In case of yield attributes significantly higher yield attributes like higher number of cobs per plant, cob length, cob girth, 1000-grain weight were recorded for 2017-18 and 2018-19. Fertilizer dose of 120-80-80 kg ha-1 N, P2O5 and K2O (F3) had resulted the highest grain yield of 51.42 q ha-1 and stover yield of 89.14 q ha-1 when pooled over two years followed by the next higher dose of fertilizer viz., N, P2O5 and K2O @ 90-60-60 kg ha-1 (F2) in both the years. Pooled analysis of maize equivalent yield was found to be significantly affected by the highest dose of fertilizer i.e. N, P2O5 and K2O@ 120-80-80 kg ha-1 with an yield of 55.83 q ha-1. In case of N, P2O5 and K2O content and uptake by grain and stover in quality protein maize, highest values were recorded under N, P2O5 and K2O @ 120-80-80 kg ha-1 for both the seasons. Available N, P2O5 and K2O after harvest of maize + toria intercropping was significantly higher in plots treated with N, P2O5 and K2O@ 120-80-80 kg ha-1 for both the years followed by N, P2O5 and K2O @ 90-60-60 kg ha-1. Soil moisture content at 90 days after sowing was significantly influenced by 120-80-80 kg ha-1 of N, P2O5 and K2O application. Soil depth of 15-30 recorded higher values of moisture content as compared to 0-15 cm depth in two consecutive years. Light transmission ratio (LTR) was maximum in plots with the highest dose of fertilizer viz., N, P2O5 and K2O @ 120-80-80 kg ha-1 in all the stages i.e. vegetative, reproductive and at harvest during both the years. In intercrop 7 toria, growth parameters, yield attributes, pooled seed (4.67 q ha-1) and stover yield (13.06 q ha-1) were found to be significant and the highest was recorded due to F3 treatment (N, P2O5 and K2O @ 120-80-80 kg ha-1) applied to the main crop maize for both the years. Among the paired row intercropping, row spacing of 75cm (60/90) x 25cm resulted in significantly higher growth parameters of maize whereas row spacing 65cm (40/90) x 25 cm recorded the highest yield attributing characters and highest pooled grain of 50.31 q ha-1 and stover yield of 89.98 q ha-1 of quality protein maize. The highest maize equivalent yield of 53.79 q ha-1 was obtained at a row spacing of 65cm (40/90) x 25 cm when pooled for two years. Similarly, NPK uptake by grain and stover and available N, P2O5 and K2O were significantly higher due to paired row spacing of 65 cm (40/90) x 25 cm for both the years. Highest values of LTR recorded at vegetative stage of crop in row spacing of 65 cm (40/90) x 25 cm for two years consecutively. In intercrop toria, growth parameters, yield attributes, seed yield (pooled-4.57 q ha-1) and stover yield (pooled-13.05 q ha-1) were found to be significant and recorded highest due to row spacing of 65 cm (40/90) x 25 cm for both the years. For results in method of sowing, normal row sowing was found to be the highest with pooled grain yield of 49.22 q ha-1 and stover yield of 89.98 q ha-1 with higher N, P and K uptake. However, paired row sown crop recorded the highest maize equivalent yield (pooled-52.84 q ha-1) as well as soil moisture contents were found to be superior in normal row sown crop at 30 and 90 days of sowing. In terms of economics, maximum gross return Rs.97707.22 ha-1, net return of Rs.64194.22 ha-1 and B-C ratio of 2.91 were recorded in the treatment level of N, P2O5 and K2O @ 120-80-80 kg ha-1. Paired row spacing of 65cm (40/90) x 25 cm recorded maximum gross return of Rs.94127.53 ha-1, net return of Rs.63246.53 ha-1 and B-C ratio of 3.05 in maize + toria intercropping. In method of sowing under paired row intercropping, the highest mean gross return of Rs.92478.46 ha-1, net return of Rs.60922.46 ha-1 and highest B- C ratio of 2.93 was recorded. The performance of maize + toria intercropping was assessed on the basis of maize equivalent yield, monetary returns and B-C ratio as well as soil nutrient status. In respect of all the above assessment, application of nutrient level N, P2O5 and K2O @120-80-80 kg ha-1 was found to be the best dose of quality protein maize for obtaining higher productivity along with toria as intercrop with optimum paired row spacing of 65cm (40/90) x 25cm.