Loading...
Assam Agricultural University, Jorhat
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.
Browse
21 results
Search Results
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 Open Access PERFORMANCE OF BABY CORN AS INFLUENCED BY SPACING AND NUTRIENT MANAGEMENT(AAU, Jorhat, 2018) Neelam; Dutta, RinjumoniA field experiment entitled “Performance of baby corn as influenced by spacing and nutrient management” was conducted at Instructional-cum-Research (ICR) Farm, Assam Agricultural University, Jorhat during the summer season, 2017 to find out the effect of spacing on production of baby corn and to study the performance of baby corn under different nutrient management practices. The experiment was laid out in split-plot design and replicated thrice. The treatments consisted of four spacing viz., 40 cm x 20 cm (S1), 40 cm x 25 cm (S2), 45 cm x 20 cm (S3) and 45 cm x 25 cm (S4) in main plot and three nutrient management practices viz., 120-60-60 N-P2O5-K2O (kg/ha) (I1), 75% of N of I1 + 25% N replaced by VC (I2) and 50% of N of I1 + 50% N replaced by VC (I3) in sub-plot. The baby corn variety VL-78 was sown on 7th March, 2017. The soil of experimental site was sandy loam in texture, acidic in reaction, medium in organic carbon (0.72%), low in available N (224.12 kg/ha) and medium in available P2O5 (24.48 kg/ha) and K2O (161.32 kg/ha). Experimental findings revealed that spacing 40 cm x 20 cm and 45 cm x 20 cm had significantly higher plant height and leaf area index as compared to 40 cm x 25 cm and 45 cm x 25 cm at 45 DAS and at harvest. Spacing had non-significant effect on days taken to 50 per cent silking and baby corn initiation. Wider spacing of 45 cm x 25 cm had significantly more number of cobs per plant, weight of cob and length of cob with as well as without husk and baby corn girth, while all of them were found to be at their lowest with closer spacing of 40 cm x 20 cm. However, yield of cob with husk, without husk and fodder yield was found to be the higher under spacing 45 cm x 20 cm i.e. 89.93 q/ha, 18.65 q/ha and 289.08 q/ha respectively. Cob yield with husk obtained under 45 cm x 20 cm spacing increased by 4.10 per cent, 5.58 per cent and 8.64 per cent over other spacing viz., 45 cm x 25 cm, 40 cm x 25 cm and 40 cm x 20 cm respectively. Total N, P and K uptake was also found to be higher under 45 cm x 20 cm spacing than rest of the spacing treatments. Spacing had non-significant effect on available N, P2O5 and K2O (kg/ha) status of soil after harvest. The different nutrient management practices showed significant influence on growth parameters and all yield attributing characters of baby corn. Better results were obtained with the integrated nutrient management practices over the application of chemical fertilizers alone. Among various proportions of fertilizer and vermicompost, application of 75% of N of I1 + 25% N replaced by VC recorded the highest values for plant height and leaf area index. Similar trend of results were observed in yield attributing characters viz., number of cobs per plant, weight of cob and length of cob with as well as without husk and girth of baby corn. 75% of N of I1 + 25% N replaced by VC resulted into production of maximum cob yield with husk (90.62 q/ha), cob yield without husk (19.30 q/ha) and green fodder yield (294.15 q/ha). Higher uptake of total N, P and K at harvest was also reported from this treatment. However, nutrient status of soil after harvest of the baby corn was found higher under treatment 50% of N of I1 + 50% N replaced by VC. In terms of economics, higher gross return ( 1,63,803/ha), net return ( 1,32,422/ha) and benefit-cost ratio (4.21) was recorded from 45 cm x 20 cm spacing. Among different nutrient management practices 75% of N of I1 + 25% N replaced by VC recorded the highest gross return ( 1,65,345) and net return ( 1,33,954). However, the highest benefit-cost ratio (4.67) was recorded from treatment 120-60-60 N-P2O5-K2O (kg/ha) followed by 75% of N of I1 + 25% N replaced by VC (4.26).ThesisItem Open Access EFFECT OF INTERCROPPING AND PLANTING METHODS ON PERENNIAL GRASSES(AAU, Jorhat, 2018) deori, Chinmoy; Thakuira, K.A field experimentwas conducted from October, 2016 to December, 2017 at the Instructional – cum Research Farm of Assam Agricultural University, Jorhat to evaluate the performance of three perennial grasses under sole and intercropping systems adopting two planting methods.The treatments consisted of three sole croppings (Hybrid napier, Setaria and Guinea), and combinations of three intercroppings, (Hybrid napier + Setaria,Hybrid napier+Guinea and Setaria + Guinea) with two planting methods (Alternate row and Alternate row and column). Altogether 9 treatments were allotted in randomized block design with four replications. The soil of the experimental site was sandy - loam in texture with acidic in soil reaction (pH 5.11), medium in organic carbon (0.61%), available P2O5 (22.94 kg/ha) and available K2O (143.54 kg/ha) but low in available N (164.30 kg/ha). A uniform dose of 5t FYM/ha along with 40-40-20 kg N, P2O5, K2O/ha was applied as basal one day ahead of planting of perennial grasses. Subsequent application of nitrogen @ 30 kg/ha was done after each cutting of all the perennial grasses. Rooted slips of setaria and guinea except for hybrid napier @ three slips/pit and three budded stem cuttings in case of hybrid napier @ one cutting/pit were planted on 3 October, 2016 as per treatment by making pits of 6-8 cm diameter and 10-12 cm deep in well prepared land. All the sole and intercrops were harvested observing their growth. During the year of establishment (2016), only one cut was taken and four cuts were taken in 2017. The total rainfall received during the growing period of grasses in 2016 and 2017 was 138.5 mm and 2290.8 mm in 10 and 126 rainy days, respectively. The total green fodder yield of grasses was not significant when sole and other treatments were compared. However, the effect of sole cropping of all three grasses was found to be significant at all cuts and total of all cuts in 2017. Sole cropping of setaria recorded the highest green fodder yield over the other sole croppings. The effect of intercropping was significant only at third and fourth cuts of the year 2017. Intercropping, Setaria + Guinea recorded the highest green fodder yield over the other intercroppings. Though the effect of planting methods was not significant, slight increase in green fodder yield was noticed when alternate row and column method was followed in intercropping. The average green fodder yield of two years (5 cuts) showed that sole cropping of setaria and intercropping, Hybrid napier + Setaria in alternate row and column method produced the highest green fodder yield. The total dry matter yield failed to differ significantly when sole and other intercroppings were compared as a whole in both the years.In the year 2016 and at fourth cut in 2017, sole cropping of guinea recorded the highest dry matter yield. However, the total of all cuts during 2017, sole cropping of setaria produced the highest dry matter yield. The average data of two years when compared show that hybrid napier as sole cropping and intercropping,Setaria + Guinea in alternate row and column method recorded the highest dry matter yield. The crude protein content of grasses when compared individually, none of the treatments were found to be significant. However, intercropping, Hybrid napier + Setaria and Hybrid napier+Guineawith alternate row method recorded the highest crude protein content of hybrid napier. Similarly, intercropping, Setaria + Guinea in alternate row and column method recorded the highest crude protein content of setaria and sole planting of guinea recorded the highest crude protein content in both the years. The total crude protein yield had no any significant difference when both sole and other treatments as a whole were compared. Sole cropping of guinea recorded the highest crude protein yield during 2016 and sole cropping of setaria recorded the highest crude protein yield during 2017. The effect of intercroppings was not significant, however, intercropping, Hybrid napier+Guinearecorded the highest crude protein yield during 2016 and intercropping, Setaria + Guinea recorded the highest crude protein yield during 2017. The average data of two years showed that sole cropping of guinea and intercropping,Setaria+Guineain alternate row and column method recorded the highest crude protein yield. The average land equivalent ratio (LER) value of two years recorded highest in intercropping, Setaria + Guinea with alternate row and column method. The competition ratio (CR) values in the year of establishment when compared showed that guinea was more competitive, however during 2017, setaria was more competitive when intercropped with either hybrid napier or guinea in both the planting methods. The different sole and intercroppings of grasses as well as planting methods could not bring about any significant change in pH, organic carbon and available N, P2O5 and K2O contents in soil. The net profit and net profit per rupee invested were recorded highest with sole cropping of hybrid napier during 2016 and with setaria during 2017. Among intercropping, Hybrid napier + Setariarecorded the highest net profit and net profit per rupee invested during both the years and average over two years.Alternate row and column method (AR&C) also recorded higher net profit as well as net profit per rupee invested over the alternate row method (AR).ThesisItem Open Access PHOSPHORUS MANAGEMENT IN AEROBIC RICE(AAU, Jorhat, 2017-07) Ghasal, Kajod Mal; Pathak, KalyanA field experiment entitled „Phosphorus management in aerobic rice‟ was carried out in the Instructional-cum-Research (ICR) Farm, Assam Agricultural University, and Jorhat during autumn season of 2016. The treatment of the experiment consisted of three phosphorus sources viz., S1: single super phosphate, S2: diammonium phosphate and S3: rock phosphate, three doses of phosphorus viz., D1:10kg P2O5 ha-1, D2:20kg P2O5 ha-1 and D3:30kg P2O5 ha-1 and two biofertilizer treatments i.e. B1: without biofertilizer and B2: Azospirillum + PSB. One absolute control was included for comparison. The experiment was laid out in factorial randomized block design (RBD) replicated thrice with the objectives to study the performance of aerobic rice under different sources and levels of phosphorus and to evaluate the phosphorus use efficiency of aerobic rice. The soil of the experimental site was sandy loam in texture, medium in available N (285.36kg ha-1), P2O5 (22.85kg ha-1) and K2O (138.04kg ha-1) and organic carbon (0.62%) with pH value of 5.2. The rice variety “Inglongkiri” was sown on 11th March, 2016 and harvested on 08th July. 2016. The rainfall received during the crop season was only 1350 mm. The weekly average maximum temperature ranged from 24.9 to 33.5°C and minimum temperature 15.9 to 26.1°C, respectively. Out of the three phosphorus sources, rock phosphate recorded the highest grain (26.19q ha-1) and straw (47.05q ha-1) yield followed by single super phosphate. Among the doses, highest grain (27.43q ha-1) and straw (49.39q ha-1) yield were recorded in 30kg P2O5ha-1 and the lowest grain (22.37q ha-1) and straw (37.70q ha-1) yield were found in 10 kg P2O5ha-1. In case of bio-fertilizer, Azospirillum + PSB recorded higher grain yield (26.17q ha-1) than that of without bio-fertilizer (22.87q ha-1). Significantly higher N, P and K uptake were recorded with phosphorus application through rock phosphate which was statically at par with single super phosphate. Rock phosphate recorded higher values of agronomic (39.76kg kg-1) and physiological use efficiency (207.02kg kg-1) of phosphorus which was followed by the source single super phosphate. Application of 30kg P2O5 ha-1 recorded higher values N, P and K uptake by grain, straw and total and significantly higher available P2O5 (31.2 kg ha-1)in soil after harvest. Out of the three doses of phosphorus, application of 10kg P2O5 ha-1 registered highest agronomic use efficiency (36.16kg kg-1) and the highest physiological use efficiency of phosphorus (234.18kg kg -1) was recorded with 30kg P2O5 ha-1. Azospirillum + PSB exhibited significantly higher N, P, K uptake, agronomic use efficiency (39.43kg kg-1) and physiological use efficiency of phosphorus (223.48kg kg-1) than without biofertilizer treatment. So far the economics is concerned, the treatment combination that included application of rock phosphate at the rate of 30kg P2O5 ha-1 inoculated with Azospirillum + PSB recorded the highest net return of .56,717.00 ha-1 and with highest benefit-cost ratio (B:C) of 2.63.ThesisItem Open Access NUTRIENT AND WEED MANAGEMENT IN BUCKWHEAT (Fagopyrum esculentum) AFTER SALI RICE(2019-12) Timung, Bamon; Choudhary, J.K.An experiment entitled “Nutrient and weed management in buckwheat (Fagopyrum esculentum) after sali rice” was conducted at Instructional-cum-Research farm, Assam Agricultural University, Jorhat during the rabi season of 2018-19 to study the effect of nutrient and weed management practices on buckwheat after sali rice harvest. The experiment was laid out in factorial randomized block design with three replications. The treatment consisted of four nutrient management practices viz., control, application of 20-10-10 kg/ha N-P2O5-K2O, respectively, application of 20-10-10 kg/ha N-P2O5-K2O, respectively + 1.25t/ha vermicompostand application of 20-10-10 kg/ha N-P2O5-K2O, respectively + 2.5t/ha vermicompostand three weed management treatments viz.,control,pre-emergence application of pendimethalin@ 0.75 kg/haand pre-emergenceapplication of pendimethalin @ 0.75 kg/ha + dryland weeder at 40 DAS. The soil of the experiment site was sandy loam in texture, acidic in reaction (pH: 5.6) medium in organic C (0.58 %), available N (259.56 kg/ha),P2O5 (20.40 kg/ha) and available K2O (161.23 kg/ha). The weeds of the experimental field wereEleusine indica, Panicum repens, Paspalum compressus, Digitaria setigera, Cynodon dactylon among the grasses; Cyperus rotundusamong the sedge; and Ageratum houstonianum, Commelina benghalensis, Polygonum plebeium, Mimosa pudica and Acmella ciliata among the broad leaved. The density and dry weight of weeds in rainfed buckwheat were found to be significantlylesserwith application of 20-10-10 kg/ha N-P2O5-K2O, respectively + 2.5t/ha vermicompostcompared to other treatments. As a result, the uptake of N, P and K by weeds was found to be significantly lesser with N3. The growth parameters like plant height, number of primary branches/plant and yield attributing characters viz., number of cyme/plant,number of seeds/cyme were found to be significantly higher in N3. The highest seed yield (1249.99 kg/ha), stover yield (2046.76 kg/ha) wasthus recorded with this treatment. In respect of weed management,pre-emergence application of pendimethalin@ 0.75 kg/ha + dryland weeder operation at 40 DAS was found to significantly lower the density and dry weight, N,P and K content and uptake of weeds in rainfed buckwheat.Thus, the growth and yield attributing characters of rainfed buckwheatimproved with this treatment which recorded the highest seed(1080.55 kg/ha) and stover(1824.02 kg/ha) yields. The nutrient as well as weed management interacted significantly and the combination of the two above-mentioned treatments was the best treatment combination withthe seed yield of 1333.32 kg/ha and stover yield of 2079.16 kg/ha.This treatment combination was also found to be the best with a gross return of Rs. 47,705.72, net return of Rs. 26,032.58 and B: C ratio of 1.20.ThesisItem Open Access EFFECT OF INTEGRATED NUTRIENT MANAGEMENT (INM) IN RICE-SESAME-PEA CROPPING SYSTEM(2019-07) Bokado, Kangujam; Bora, P. C.A field experiment was conducted in Instructional cum Research Farm, Assam Agricultural University, Jorhat for two years i.e, 2016-17 and 2017-18 to study the effect of integrated nutrient management (INM) on growth, yield and quality of rice-sesame-pea cropping system and also to find out the requirement of sulphur in sesame and pea. The treatment consisted of four levels of INM viz., F1: 100% N from inorganic, F2: 25% N from FYM + 75 % N from inorganic, F3: 50% N from FYM + 50 % N from inorganic and F4: 75% N from FYM + 25 % N from inorganic for rice. For sesame and pea, the treatment consisted of four levels of INM (F1, F2, F3 and F4) and four sulphur levels which include S0: 0 kg ha-1, S1: 10 kg ha-1, S2: 20 kg ha-1 and S3: 30 kg ha-1. The experiment consisted of 16 treatment combinations replicated thrice in a split-plot design. The initial soil status of the experimental site was sandy clay loam in texture, acidic in reaction, medium in organic carbon, low in available nitrogen, low in available phosphorus, medium in available potassium and low in available sulphur. Growth and yield components of rice were influenced by INM. Plant height, number of tillers per running metre, plant dry weight (g plant-1), crop growth rate (g m-2 day-1), number of effective tillers m-2 , panicle length (cm), number of grains panicle-1, test weight (g), grain yield (t ha-1), straw yield (t ha-1), harvest index (%) and benefit-cost ratio, protein content (%), carbohydrate content (%) in grain, total nitrogen, phosphorus and potassium uptake was observed to be maximum at 100% N from inorganic. INM and sulphur levels influenced growth and yield components of sesame significantly. Plant height, number of branches plant-1, plant dry weight (g plant-1), crop growth rate (g m-2 day-1), number of capsules plant-1, number of seeds capsule-1, grain yield (t ha-1), stover yield (t ha-1), harvest index (%), protein content (%), oil content (%) in grain, total nitrogen, phosphorus, potassium and sulphur uptake was observed to be maximum at 75% N from FYM + 25% N from inorganic + 30 kg S ha-1. The effect of INM and sulphur on growth and yield components of succeeding pea was significantly influenced by nitrogen levels and sulphur levels. Plant height, number of branches plant-1, plant dry weight (g plant-1), crop growth rate (g m-2 day-1), number of pods plant-1, number of seeds pod-1, pod yield (t ha-1), stover yield (t ha-1), harvest index (%), protein content (%), oil content (%) in seed, total nitrogen, phosphorus, potassium and sulphur uptake was observed to be maximum at 75% N from FYM + 25% N from inorganic+ 30 kg S ha-1.ThesisItem Open Access Effect of nitrogen levels and seed rate on fodder productivity of rye grass (Lolium multiflorum)(AAU, Jorhat, 2018-07) Bora, Sarat Sekhar; Sharma, K. K.A field experiment was carried out at the Instructional-cum-Research (ICR) farm, Assam Agricultural University, Jorhat during 2016-2017. The experiment was laid out in split-plot design replicated thrice to assess the “Effect of nitrogen levels and seed rate on fodder productivity of rye grass (Loliummultiflorum)”. The treatments consisted of three different seed rates in main plot viz., 10 kg/ha, 15 kg/ha and 20 kg/ha along with four nitrogen levelsviz.0 kg/ha, 30 kg/ha, 60 kg/haand 90 kg/ha in sub-plots. It was revealed that effect of seed rates of rye grass was found to be significant on various growth and yield parameters. A seed rate of 20 kg/ha was found to be statistically superior in regards to growth parameters in all the three cuts viz. 1st, 2nd and 3rd cut as compared to15 kg and10 kg seed rate/ha. The highest green forage yield(330.30 q/ha) andcrude protein yield (6.21 q/ha)were obtained withseed rate of 20 kg/haand was significantly superior to 15 kg/ha and 10 kg/ha. The dry matter yield were also found to be significantly higher in seed rate of 20 kg/ha (71.88 q/ha). Effect of graded dose of nitrogen revealed that increasing levels of nitrogen from 0 kg to 90 kg/ha has sown positive trend in almost all the growth and yield parameters. Application of 90 kg N/ha resulted in higher values in almost all the growth and yield parameters. The highest green forage yield (381.43 q/ha) dry matter yield (83.179 q/ha) and crude protein yield (7.43 q/ha) were obtained in 90 kg N /ha and was found to be significantly superior to all other lower doses of nitrogen (60kg and 30 kgN/ha). Interaction effect of seed rate and nitrogen levels were found to be significant in respect of important parameters like plant height,tillers/m2, green forage yield,drymatter yield and crude protein yield. Economic indices indicated that the highest net return ofRs. 51253.00and B:C ratio of 1.58 were recorded in 20 kg/ha seed rate as compared to other lower seed rate (15 kg and 10 kg/ha).In case of nitrogen levels, higher net return was founddue to application of 90 kg N/ha (Rs. 48777.00/ha) with B:C ratio of 1.59. The present investigation revealed that rye grass as rabiforage crop responded positively to increase levels of seed rate and nitrogen in respect of forage productivity and quality. Application of 20kg /ha seed rate in combination with 90kg N/ha has been found to be more productive and profitable in rye grass.ThesisItem Open Access INTEGRATED MANAGEMENT OF NUTRIENT AND WEED IN YELLOW SARSON [Brassica rapa L. var. trilocularis (Roxb.) Kitam] UNDER RAINFED CONDITION(AAU, Jorhat, 2018-07) Gogoi, Kalpana; Choudhary, J.K.An experiment entitled “Integrated management of nutrient and weed in yellow sarson (Brassica rapa L. var. trilocularis (Roxb.) Kitam) under rainfed condition” was conducted at Instructional-cum-Research Farm, Assam Agricultural University, Jorhat during rabi seasons of 2016-17 and 2017-18 to find out the effect of integrated weed management (IWM) on growth and yield of yellow sarson and a suitable integrated nutrient management (INM) practice for yellow sarson. The experiment was laid out in factorial randomized block design with three replications. The treatments consisted of five INM practices viz., control (N0), RDF (60-30-30 kg/ha N, P2O5, K2O, N1), 25% RDF + 75% of N through vermicompost (N2), 50% RDF + 50% of N through vermicompost (N3) and 75% RDF + 25% of N through vermicompost (N4), and, three IWM practices viz., weedy check (W0), pendimethalin 0.75 kg/ha pre-em+MW 20DAS (W1) and pendimethalin 1.0 kg/ha pre-em+MW 20DAS (W2). The soil of the experimental site was sandy loam in texture, acidic in reaction (pH: 5.6 and 5.5), medium in organic carbon (0.58% and 0.54%), available N (259.86kg/ha and 255.75kg/ha) and available K2O (160.82kg/ha and 156.49kg/ha) and low in available P2O5 (20.87kg/ha and 20.00kg/ha) in the years 2016-17 and 2017-18, respectively. The weed flora of the experimental field were Paspalum conjugatum L., Axonopus compressus (Sw.)P. Beauv., Cynodon dactylon (L)Pers., Panicum repens L., and Eleusine indica (L) Gaertn., among the grasses; Cyperus esculentus L. among the sedge; and Alternanthera philoxeroides Griseb., Soliva anthemifolia, Ageratum houstonianum Mill., Oxalis corniculata L., Melochia corchorifolia L., Chenopodium album L., Commelina benghalensis L., Mimosa pudica L. and Polygonum plebeium R.Br. The data revealed that the density and dry weight of weeds during both the years were found to be significantly lesser with N4 compared to rest of the treatments. As a result, the content and uptake of N, P and K by weeds were found to be significantly lesser with N4. Moreover, the growth parameters (barring N3 which was at par with N4) and yield attributing characters were significantly improved due to N4. The highest seed yield (969.00 and 949.00kg/ha during 2016-17 and 2017-18, respectively) and stover yield (2921.11 and 2846.67kg/ha during 2016-17 and 2017-18, respectively) of yellow sarson were recorded with N4. The oil content, oil yield, N, P and K content and uptake also increased with N4. In respect of IWM, W2 i.e., pendimethalin 1.0 kg/ha pre-em + MW 20 DAS was found to result in significantly lesser density and dry weight of weeds with lower NPK content and uptake in weeds. The growth and yield attributing characters of yellow sarson were improved with W2 which also recorded the highest seed yield (964.00 and 943.33 kg/ha during 2016-17 and 2017-18, respectively) and stover yield (2900.67 and 2830.00 kg/ha during 2016-17 and 2017-18, respectively). With regard to oil content, oil yield, N, P and K content and uptake, the values were significantly higher with W2. The INM interacted significantly with IWM in respect of seed and stover yields of yellow sarson. The combination of N4W2 was found to be superior with 1210.00 and 1190.00 kg/ha seed yield and 3673.33 and 3570.00 kg/ha stover yield during 2016-17 and 2017-18, respectively. The comparative economics highlighted that N4W2 combination resulted in the highest gross return (Rs. 62336.5/ha and Rs. 61285/ha during 2016-17 and 2017-18, respectively), net return (Rs.39378.5/ha and Rs.38327/ha during 2016-17 and 2017-18, respectively) and benefit:cost ratio (2.71 and 2.66 during 2016-17 and 2017-18, respectively).ThesisItem Open Access COPING UP WITH CLIMATE CHANGE VARIABILITY THROUGH THE PRACTICE OF DIRECT SEEDING OF EARLY AHU RICE UNDER MEDIUM LAND SITUATION(AAU, Jorhat, 2018-07) BHATTACHARJYA, DIBYARISHI; Sarma, A.A field experiment entitled “Coping up with climate change variability through the practice of direct seeding of early ahu rice under medium land situation” was carried out at the Instructional-cum-Research (ICR) Farm, Assam Agricultural University, Jorhat during 2017 to developthe irrigation schedule of direct seeded early ahu rice under medium land situation and to develop package of practices for direct seeded early ahu rice to suit the variability in rainfall pattern covering the angle of nutrient management practices. The experiment was laid out in a split plot design with 3 replications. The treatments consisted of four irrigation regimes viz. irrigation at 80% available water till onset of pre-monsoon rain (I1), irrigation at 70% available water till onset of pre-monsoon rain (I2), irrigation at 60% available water till onset of pre-monsoon rain (I3) and rainfed (I4) as main plot and three nutrient management treatmentsviz. full P as basal + ½ N and ½ K at 20 DAS + ½ N and ½ K at 40 DAS (N1), full P as basal, 1/3 N and 1/3 K as basal + 1/3 N and 1/3 K at 20 DAS + 1/3 N and 1/3 K at 40 DAS (N2) and full P as basal, ½ N and ½ K as basal + ¼ N and ¼ K at 20 DAS + ¼ N and ¼ K at 40 DAS (N3) as sub plotand control (transplanted early ahu rice with recommended water and fertilizer management practices). The soil of the experimental plot was silt loam in texture having pH 5.2, organic carbon 7.2 g/kg, alkaline KMnO4 extractable N 181.0 kg/ha, Brays-I P 10.7 kg/ha and 1 N ammonium acetate extractable K 227.9 kg/ha. It contained soil moisture 27.6% at -0.03 MPa and 9.6 % at -1.5 MPa with bulk density of 1.34 g/cc. The rice variety “Inglongkiri” was sown on 18th February, 2017. The control treatment with recommended water and nutrient management practice was transplanted on 17th March, 2017. The direct seeded crop was harvested on 15thJune, 2017 and the transplanted crop (control) was harvested on 22nd June, 2017. Experimental findings revealed thatirrigation at 80% available water till onset of pre monsoon rain (I1) recorded the highest values for all the morphological and physiological parameters along with the yield, yield attributing characters, nutrient (N,P and K) uptake and water use efficiency (WUE) of the crop. The highest grain yield (39.83 q/ha) and straw yield (90.96 q/ha) wererecorded atirrigation at 80% available water (I1). However, nutrient content in soil after harvest of the crop was found to be non-significant. The highest uptake of nitrogen (105.5 kg/ha), phosphorus (24.3 kg/ha) and potassium (124.2 kg/ha) were obtained from irrigation at 80% available water (I1). However, nutrient content in soil after harvest of the crop was found to be non-significant. The highest values of all the morphological and physiological parameters along with the yield, yield attributing characters, nutrient (N, P and K) uptake and water use efficiency (WUE) of the crop were recorded under the nutrient management practice of full P as basal + ½ N and ½ K at 20 DAS + ½ N and ½ K at 40 DAS (N1). This treatment also recorded the highest grain yield (34.16 q/ha) and straw yield (83.45 q/ha) and uptake of nitrogen (98.2 kg/ha), phosphorus (22.3 kg/ha) and potassium (115.6 kg/ha). However, nutrient content in soil after harvest of the crop was found to be non-significant. The experiment did not show any significant difference between direct seeded crop and transplanted crop with respect to growth parameters, yield attributes and yield. However, direct seeded rice recorded lower water use and higher WUE than transplanted crop. Direct seeded crop also recorded the higher net return and benefit-cost ratio.
- «
- 1 (current)
- 2
- 3
- »