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Dr. Rajendra Prasad Central Agricultural University, Pusa
In the imperial Gazetteer of India 1878, Pusa was recorded as a government estate of about 1350 acres in Darbhanba. It was acquired by East India Company for running a stud farm to supply better breed of horses mainly for the army. Frequent incidence of glanders disease (swelling of glands), mostly affecting the valuable imported bloodstock made the civil veterinary department to shift the entire stock out of Pusa. A British tobacco concern Beg Sutherland & co. got the estate on lease but it also left in 1897 abandoning the government estate of Pusa.
Lord Mayo, The Viceroy and Governor General, had been repeatedly trying to get through his proposal for setting up a directorate general of Agriculture that would take care of the soil and its productivity, formulate newer techniques of cultivation, improve the quality of seeds and livestock and also arrange for imparting agricultural education. The government of India had invited a British expert. Dr. J. A. Voelcker who had submitted as report on the development of Indian agriculture. As a follow-up action, three experts in different fields were appointed for the first time during 1885 to 1895 namely, agricultural chemist (Dr. J. W. Leafer), cryptogamic botanist (Dr. R. A. Butler) and entomologist (Dr. H. Maxwell Lefroy) with headquarters at Dehradun (U.P.) in the forest Research Institute complex.
Surprisingly, until now Pusa, which was destined to become the centre of agricultural revolution in the country, was lying as before an abandoned government estate. In 1898. Lord Curzon took over as the viceroy. A widely traveled person and an administrator, he salvaged out the earlier proposal and got London’s approval for the appointment of the inspector General of Agriculture to which the first incumbent Mr. J. Mollison (Dy. Director of Agriculture, Bombay) joined in 1901 with headquarters at Nagpur
The then government of Bengal had mooted in 1902 a proposal to the centre for setting up a model cattle farm for improving the dilapidated condition of the livestock at Pusa estate where plenty of land, water and feed would be available, and with Mr. Mollison’s support this was accepted in principle. Around Pusa, there were many British planters and also an indigo research centre Dalsing Sarai (near Pusa). Mr. Mollison’s visits to this mini British kingdom and his strong recommendations. In favour of Pusa as the most ideal place for the Bengal government project obviously caught the attention for the viceroy.
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ThesisItem Open Access Efficient utilization of organic waste for quality vermicompost production and its impact on soil health and crop productivity(Dr.RPCAU, Pusa, 2022) Kumar, Rajesh; Jha, ShankarThe catastrophic growth in population has led to massive urbanization, industrialization, with noticeable advancement in agriculture; increased the economic growth on one hand but gave the ways for generating more municipal and other solid wastes on other, affected soil-water-plant ecosystem ultimately the whole environment and the population. There is a need for effective waste management, as unscientific disposal of organic waste has not only negative impact on the environment and public health but also a cause of untapped nutrient loss adhered with these wastes. The untapped nutrients of the waste may be utilized for further crop and soil improvement vide adopting suitable techniques of vermicomposting. Among various methods of composting, one of the best options for treating domestic household waste is vermicomposting. Scientific utilization of organic solid wastes can provide nutrients for plant growth as well as improve soil health, for utilizing these wastes, vermicomposting can be an eco-friendly and economically viable technology. However, ordinary vermicompost is low in nutrients (macro and micronutrients) and by introducing some low-grade minerals, such as Rock-phosphate as well as utilizing organic waste (crop residues and household waste); its quality may be enhanced. Maize is grown in Bihar in all the three seasons (Kharif, Rabi, and Zaid). However, Rabi is the most widely grown followed by Kharif while Zaid season is the least grown and land remains fallow for most of the time. Hence, growing maize as Zaid crops not only increase crop productivity but also enhance fallow land utilization. Keeping in view the above facts, an experiment was conducted at vermicompost production unit, RPCAU, Pusa during the year 2021 and 2022 with an objective to efficiently utilize organic waste by vermicomposting and further use of the prepared vermicompost for improving soil health and crop productivity. Under this experimental study in the first approach, a vermicomposting experiment was carried out with enriched (RP) and without enriched household wastes, organicresidue waste and cow dung at 65:35 proportions, followed by a quality, maturity and stability analysis of the vermicompost. On the basis of nutrients contents (macro and micro nutrient), physical parameters (water holding capacity and bulk density) and recovery per cent, the vermicompost prepared from enriched (RP) and without enriched household wastes, organic-residue waste and cow dung proportions (65:35) on weight basis was considered the best one. In the second approach, a field experiment was conducted with maize as Zaid crop in calcareous soil in Randomized Block Design with fourteen treatments replicated thrice to evaluate the effect of prepared vermicompost integrated with chemical fertilizers (75% N through chemical fertilizer + 25% N through prepared vermicompost) including a sole treatment with only recommended dose of fertilizer (RDF-120:60:40) on soil health parameters i.e. soil physical, chemical, biological properties and enzymatic activities, productivity, nutrient uptake and nutrient use efficiency. During field experiment, enriched organic residue vermicompost with combination of chemical fertilizers led to significant build-up of organic carbon (OC), available N, P, K and micronutrient Zn, Cu, Fe & Mn as well as improved water holding capacity (36.89%) and bulk density (1.38 Mgm-3) of soil followed by enriched household vermicompost. With application of enriched (RP and Zn) household and organic residue vermicompost in combination with chemical fertilizers, the soil microbial biomass carbon, soil respiration, dehydrogenase and alkaline phosphatase activities increased by 24.78%, 75.86%, 81.57% and 61.50% over control in post-harvest soil, respectively. Application of enriched household vermicompost along with chemical fertilizers gave highest grain, stover, and stone yields which were statistically at par with application of enriched organic residue vermicompost along with chemical fertilizers and their magnitudes were 69.60 and 69.20 q ha-1 for grain, 81.32 and 79.92 q ha-1 for stover, 14.31 and 13.64 q ha-1 for stone, respectively in both the years i.e. 2021 and 2022. In the same fashion N, P, K and Zn uptake in grain, stover and stone of maize was significantly higher in the enriched household and organic residue vermicompost over control. However, the application of household and organic residue vermicompost and 75% N through chemical fertilizers yielded more as full dose of inorganic fertilizer (RDF) alone. Thus, combined application of enriched and without enriched vermicompost and inorganic fertilizer recorded greater nutrient use efficiency than control and RDF. Thus, 25% of chemical fertilizer could be saved with the combination of vermicompost and 75% RDF without reducing yields of grain, stover, and stones. It can be concluded from the present study that application of RP enriched vermicompost along with 75% NPK had pronounced impact on improving soil fertility as well as enzymatic activities and increased crop productivity under maize crop.ThesisItem Open Access INFLUENCE OF TRASH TREATMENTS ON SOIL C AND N INDICES UNDER SUGARCANE PLANT-RATOON SYSTEM(Dr.RPCAU, Pusa, 2022) Bairwa, Rajendra; Jha, C. K.Sugarcane crop generates around 8-12 t ha-1 trash. The trash an asset in sugarcane system which can be used as source of biomanure/mulching. The trash mulching regulates the rhizospheric environment and ultimately improves crop growth and yield. Nevertheless, the management of soil carbon and nitrogen is a major constraint in sugarcane based intensive system for sustaining soil health and sugarcane productivity. Thus, enhancing soil carbon and nitrogen in the sugarcane-based system has become an important concern due to declining factor productivity and nutrient availability. In view of the above facts present study was carried out at Dr. Rajendra Prasad Central Agricultural University Pusa (Bihar) during the year 2020-2022, to investigate the “Influence of Trash Treatments on Soil C and N Indices under Sugarcane Plant-Ratoon System”. The field investigation was conducted in randomised block design with eight treatments and three replications. The treatments comprised of trash mulching @10 t ha-1 either alone or activated with 25 kg N ha-1 (through urea) / farmyard manure (5t ha-1) / vermicompost (@2.5 t ha-1) / trash mulching inoculated with Trichoderma viride / Azotobacter + PSB and trash incorporated in soil with no trash control. The dose of chemical fertilizer for plant (150 N: 85 P2O5: 60 K2O kg ha-1) and ratoon (170 N: 60 P2O5: 60 K2O kg ha-1) has been applied as per recommendation in all the treatments. The results revealed that treatments of trash mulching either treated with urea/FYM/vermicompost or inoculated with Trichoderma/Azotobacter +PSB significantly enhanced CO2 evolution in soil over control. The CO2 evolution decreased continuously with the advancement of crop growth. The fractions of total organic carbon significantly increased due to trash mulching / incorporation as compared to no trash control. The very labile (1.62 – 2.76 g kg-1), labile (1.09 – 2.17 g kg-1), less labile (1.55 – 2.21 g kg-1) and non-labile carbon (2.18-2.95 g kg-1) varied significantly after two crop cycles. The carbon fractions were in order of non-labile-C (Fraction-IV) > very labile-C (Fraction-I) > less labile-C (Fraction-III) > labile-C (Fraction-II). The mean soil organic carbon (4.53-6.93 g kg-1), total organic carbon (6.26 - 9.79 g kg-1), organic carbon stock (14.70 – 20.76 Mg ha-1), microbial biomass carbon (110.73-265.16 mg kg-1) and microbial quotient (1.77 - 2.71%) differed significantly due to trash mulching treatments either activated with organics/inoculated with microbes after harvest of ratoon. carbon pool index (1.00-1.57) and carbon management index (138.36-238.30) varied and improved significantly in trash treated plots as compared to no trash control after ratoon. However, the soil carbon lability index was found non-significant. The maximum nitrate-N fraction observed in trash mulching treatment treated with urea, while other forms of nitrogen fractions dominated in trash mulching treatments activated with organics/microbial inoculants. The N-fractions viz. nitrate-N (15.70-18.03 mg kg-1), exchangeable ammonical-N (66.46-100.50 mg kg-1), total hydrolysable-N (242.92-363.95 mg kg-1), non-hydrolysable-N (140.55-200.69 mg kg-1) and total-N (447.76-699.01 mg kg-1) differed and found significant due to treatments of trash mulching. Among the hydrolysable-N, the highest value recorded for amino acid-N followed by ammonium-N, unidentified-N and least value for hexoseamine-N. The N-indices viz. nitrogen lability, nitrogen lability index and nitrogen pool index of soil significantly influenced by trash treatments while nitrogen management index did not differ. The nitrogen fractions were in a dynamic state of equilibrium and various nitrogen fractions behaving interchangeably, as indicated by the correlation coefficient (r value) among the nitrogen fractions. The trash mulching brings significant changes and enhancement in physical, chemical and biological environment of soil. The mean soil penetration resistance of surface (1.26 – 1.40 MPa) and sub-surface (3.68-4.09 MPa) varied significantly after harvest of ratoon crop. The significant improvement in bulk density, aggregate size distribution, pore space and water holding capacity of soil also observed in trash mulching treatments after two crop cycles. The availabilityof macro (N, P & K) and micro nutrients (Fe, Zn, Cu & Mn) enhanced significantly with positive balance of NPK due to trash mulching. The results revealed that plant height, dry matter, tiller, millable cane and cane length enhanced in plant and ratoon crop due to treatments of trash mulching. The mean cane yield of plant (65.96-83.31 t ha-1) and ratoon crop (54.20-71.99 t ha-1) differed significantly among treatments. Juice quality parameters viz., pol, purity coefficient and commercial cane sugar remains unaffected due to trash mulching. However, brix (%) improved significantly in ratoon crop only. The mean sugar yield varied significantly in plant (7.22-9.97 t ha-1) and ratoon crop (5.78-8.58 t ha-1) due to various trash mulching treatments. The higher sugar yield was recorded in plant crop as compared to ratoon crop. The positive relationship was found among cane and sugar yield with carbon and nitrogen indices. The increasing cane yield resulted more uptake of nutrients by plant and ratoon crop. The mean uptake of N (230.07-297.39 Kg ha-1), P (17.22-22.07 Kg ha-1), K (205.00-283.06 Kg ha-1), Fe (3663-5505 g ha-1), Zn (712-939 g ha-1), Cu ( 1417-1835 g ha-1), Mn (723-956 g ha-1) by plant crop and N (213.47-282.40 Kg ha-1), P (15.21-20.57 Kg ha-), K (163.55-246.34 Kg ha-1), Fe (3154-4963 g ha-1), Zn (646-841 g ha-1), Mn (1253-1739 g ha-1) and Cu (621-861 g ha-1) by ratoon crop varied significantly and increased due to mulching of trash. The mean B: C ratio for plant (1.51-1.89) and ratoon (1.71 – 2.20) varied significantly. The trash mulching treatment inoculated with Trichoderma viride recorded highest B: C ratio in plant (1.89) and ratoon (2.20) crop. In general, the higher B:C ratio was obtained in ratoon crop as compared to plant crop. The soil carbon pool parameters, soil carbon stock and nitrogen fractions get better with improvement in carbon and nitrogen indices due to trash mulching treatments. The trash mulching treatments either activated with urea/FYM/vermicompost or inoculated with Trichoderma /Azotobacter + PSB brings significant enhancement in quality of soil and productivity of sugarcane plant-ratoon system in sub-tropics. Based on B: C ratio trash mulching (10 t ha-1) treated with Trichoderma viride (500 g t-1 of trash) along with RDF produced maximum profitable cane and sugar yield in Calcareous soil.ThesisItem Open Access ASSESSING CARBON SEQUESTRATION POTENTIAL AND SOIL QUALITY INDEX (SQI) UNDER HORTICULTURE BASED LAND USE SYSTEMS IN AGRO-CLIMATIC ZONE-I OF BIHAR(Dr.RPCAU, Pusa, 2022) KUMAR, PRABHAT; Prasad, S.S.Soil carbon sequestration research has gained world focus as a cost effective and eco-friendly approach in mitigating elevated CO2 level of atmosphere. The various anthropogenic activities have impacted our fragile ecosystem, leading to an increased level of carbon dioxide in the earth’s atmosphere which has not only affecting our ecosystem but also poses threat to our human race. The research was formulated with the hypothesis that SOC quality, and quantity varies due to variability in input and loss of soil C under different LUS’s of agro-climatic zone –I of Bihar. The main objective of the research undertaken was to assess carbon sequestration and soil quality under dominant LUS’s by evaluating the variation in measurable soils properties with carbon and nitrogen storage patterns. The selected experimental area lies in the middle Gangetic alluvial plain having hot dry to moist sub-humid. Based on preliminary survey, five LUS’s namely litchi solo , mango solo, litchi intercrop, rice wheat, and uncultivated were selected and accordingly composite soil sample collected i.e. total 100 samples from different soil depth 0-15, 15- 30, 30-45 and 45-60 cm. The various soil measurable physico-chemical and biological parameters were analysed and the data revealed that soil carbon is the main driver influencing various soil characteristics. Among the different LUS selected, the superior LUS followed sequence mango solo >litchi solo > litchi intercrop > uncultivated > rice wheat. The analysed soil data revealed that soil pH in different LU was moderately alkaline and ranged from 7.91 to 8.26 while electrical conductivity ranged from 0.34 to 0.48 dS m-1 which is within the safer limit. The observed soil bulk density varied significantly and was found highest in uncultivated LU 1.46 Mg m-3 while lowest in 1.41 Mg m-3 in mango solo LU. The soil surface hardness was observed highest 1368.2 KPa in uncultivated LU having highest BD value compared to other LUS’s. Soil texture in selected LU was mainly sandy loam, silty loam and clay loam but the effect of LU was non-significant. Among different LU system, the available macro-nutrient N, P, K and micro-nutrient Fe, Zn, Cu, Mn were found to be more in horticulture based LUS’s compared to rice-wheat and uncultivated LU. Significant decreases in available nutrients were observed with increase in depth of soil. The biological soil properties assessed by DHA activity, SMBC, SMBN and soil protein and found significantly better microbial properties in all three horticulture-based LUS’s when compared to rice-wheat LUS. A marked difference in SOC fraction constituents were found among different LUS’s and observed sequence NLc>VLc> Lc>LLc carbon. Among the different LUS’s soil carbon stock 0-60 cm soil depth was found to be highest in mango LU at 71.34 Mg C ha-1 followed by litchi solo 61.34 Mg C ha-1, uncultivated LU 52.33 Mg C ha-1and least it was observed in rice-wheat LU 44.69 Mg C ha-1, while similar trend also was observed in soil nitrogen stock highest in mango LU 5408.01 kg N ha-1 and least 3771.51 kg N ha-1 observed in rice-wheat LU system. In the horticultural LUS’s the total tree biomass carbon (both above and below ground) was observed highest in mango solo 51.59 q tree-1 followed by litchi solo 16.32 q tree-1 and least 15.82 q tree-1 in litchi intercrop. Soil quality index was assessed among different LU and observed best in mango solo LU 1.15 then litchi solo 1.09, litchi intercrop 1.04, uncultivated 1.02 and least observed in rice-wheat LU 0.94. The soil quality data depicts sensitive indicators selected were soil carbon stock, metabolic quotient; soil respiration, clay% and sand% in assessing SQI which may be used in future research in related studies for assessing SQI. Finally, it may be concluded that over all soil quality and carbon sequestration followed sequence mango solo > litchi solo > litchi intercrop > uncultivated > rice wheat LUS. The problem of increased current fallow area under in ACZ-I may be addressed with incorporation of horticulture tree component and adoption of suitable agronomic management practices for maintaining sustainability in the region.ThesisItem Open Access SOIL HEALTH STUDY OF DIFFERENT SOIL TYPES UNDER PROMINENT CROPPING SYSTEMS OF BIHAR(Dr.RPCAU, Pusa, 2022) Nath, Debabrata; Laik, RanjanThere are many factors that contribute to soil health, including physical, chemical, and biological factors. Some of them are dynamic in nature and behave differently based on the agro-ecological zone in which they occur and therefore are quantified using a soil health index (SHI), which measures the soil health in various agroecological zones (ACZs). A study entitled “SOIL HEALTH STUDY OF DIFFERENT SOIL TYPES UNDER PROMINENT CROPPING SYSTEMS OF BIHAR” was conducted at the Department of Soil Science, Dr. Rajendra Prasad Central Agricultural University Pusa (Bihar) with the objective to evaluate the variability in soil health parameters, minimum data sets (MDSs) to construct a soil health index (SHI) and correlation and regression to find out the direct determinants yield which will be useful in evaluating the sustainability of crops in different agroecological zones of Bihar, under rice-wheat and rice-maize cropping systems including four different ACZs, namely Sitamarhi (ACZ-I), Saharsa (ACZ-II), Banka (ACZ-IIIA) and Rohtas (ACZ-IIIB). Based on the properties of the surface soil layer (0-15 cm) that were measured by Comprehensive Assessment of Soil Health (CASH), 20 parameters were utilized to develop the soil heath index (SHI). Under R-W and RM cropping system a wide range of variations were observed in soil properties in surface soil samples that was found by descriptive analysis. Pearson’s correlation studies revealed that strong significant correlation among SOC, available N, available P2O5, WAS, AWC, sand content, soil respiration and system yield (R-W and R-M). Stepwise regression analyses showed that under the R-M cropping systems, the key soil properties like SOC and available N were the main determinants for R-M system yield in all the four ACZs, available K2O in ACZ-I and II, WAS in ACZ-I and IIIA and AWC in ACZ-IIIB. However, stepwise regression analyses showed that under the R-W cropping system also SOC and available N were the main soil determinants for R-W system yield in all the four ACZs, along with available P2O5 in ACZ-I and II, Clay in ACZ-I, IIIA and IIIB and soil respiration in ACZ-IIIB. A scoring function (non-linear) was used to convert each indicator of the MDS into a dimensionless score which in turn was integrated into four separate SHIs based on scoring functions (nonlinear). Soil health index (SHI) of R-M system showed that the overall SHI varied from 0.41-0.49. The highest SHI was found in Rohtas (0.49) followed by Saharsa (0.48). Among all the soil health parameters SOC, available N, available P2O5, available K2O, available S, soil respiration and AWC were the main contributor for the SHI. Maximum contribution was found for SOC is 13.50% in Sitamarhi (ACZ-I) followed by 12.50% in Saharsa (ACZ-II). Soil health index (SHI) of R-W system revealed that the overall SHI varied from 0.43-0.51. The highest SHI was found in Rohtas (0.51) followed by Sitamarhi (0.50). Maximum contribution was found for SOC is 15 % in Rohtas (ACZ-IIIB) followed by 14 % in Sitamarhi (ACZ-I). Quantitative predictive relationship between R-W and R-M system yield and SHI showed a positive correlation. The results demonstrated that R2 values are 0.79, 0.54, 0.65 and 0.76 in R-W system and 0.70, 0.62, 0.65 and 0.64 in R-M system for Rohtas, Banka, Saharsa and Sitamarhi respectively. On the basis of this index, it was determined that prominent cropping systems were able to be used to quantify soil health under four different ACZs. Based on this result, it was determined what would be the most suitable cropping system. Thus, it can be concluded that SHI can be used as a tool for quantifying soil health to a satisfactory level. Based on the variability observed across 20 soil health indicators across two prominent cropping systems under four different agro-climatic zones (ACZs) of Bihar, this study provides a framework for the quantitative assessment of soil health throughout four ACZs. It also helps to identify which cropping system for a given ACZ is the most suitable among existing cropping systems carried out in a particular ACZ.ThesisItem Open Access Development of Targeted Yield Equations for Aerobic Rice (Var. Rajendra neelam) under Integrated Nutrient Management(Dr.RPCAU, Pusa, 2022) KUMAR, NARESH; SUMAN, S. N.Field experiment was conducted at Pusa farm, RPCAU during the year 2021 to generate Targeted Yield based Fertilizer prescription equations for aerobic rice Var. Rajendra neelam under integrated nutrient management system. In order to develop fertilizer prescription equations, complex experiment of rice was conducted at nursery jhilly field with aerobic rice (cv. Rajendra neelam) by superimposing 24 treatments consisting of four levels of N (0, 60,120 and180 kg/ha), four levels of P2O5 (0, 30, 60 and 90 kg/ha), four levels K2O (0, 20, 40 and 60 kg/ha) and three level of vermicompost (0, 1 and 2 t/ha). The integrated nutrient management approach had a positive impact on organic carbon, soil available nutrient status, crop yield, and nutrient uptake by aerobic rice. When compared to other treatments, a combined application of 120 kg nitrogen, 60 kg phosphorus, and 40 kg potassium per hectare, along with 2 t/ha vermicompost resulted in the highest available NPK in soils with the highest crop yield and nitrogen, phosphorus and potassium uptake by aerobic rice. Fertilizer prescription equations were formulated for aerobic rice by following Ramamurthy’s Inductive-cum-targeted yield approach. Based on the experiment in the nutrient requirement (NR) for producing one quintal of aerobic rice was found to be 4.09, 0.90, 2.16 kg/q with respect to N,P and K respectively. The NPK contributions to aerobic rice from fertilizers were 48.11, 38.74, and 58.46 % respectively. Conversely, the percentage contribution of NPK from organic component that is organic efficiency was 7.34%, 4.25 %, 5.3%. Based on NR, CS, CF and CO the fertilizer prescription equations were developed for aerobic rice variety (Rajendra neelam) and an estimate of fertilizer dose were formulated in the form of ready reckoner for a range of soil test values and desired yield targets.ThesisItem Open Access EFFECT OF INTEGRATED NUTRIENT MANAGEMENT ON PRODUCTIVITY AND QUALITY OF SUGARCANE IN CALCAREOUS SOIL(Dr.RPCAU, Pusa, 2022) KUMAR, BRAJESH; Sinha, S.K.At Dr. Rajendra Prasad Central Agricultural University in Bihar, a field experiment was carried out to investigate the “Effect of integrated nutrient management on productivity and quality of sugarcane in calcareous soil” during 2021–2022.Vermicompost, green manuring (green gram), fertilizer-NPK (150:85:60) and biofertilizer (Azotobacter and PSB) were used as part of the treatments. The vermicompost was applied at planting and green gram was applied 60 days after planting (DAP). During the spring, sugarcane crop (cv. CoP 112 early) was planted. The germination percent was found non-significant and it varied from 36.5-43.4% and 46.5-55.5% at 45 and 60 days after planting respectively. Compared to strict control and 100% RDF, the combined application of organic, inorganic and biofertilizer produced a much higher number of tillers. The dry matter accumulation at 90,120 and 150 days after planting was found significant while at harvest stage it was found nonsignificant. The number of millable canes varied significantly and ranged from 70.5 × 103 to 125.4 × 103 ha-1. The maximum NMC (Number of millable cane) was obtained in the treatment receiving RDF together with vermicompost and biofertilizer (Azotobacter and PSB). Due to different treatments, the mean cane yield varied significantly and ranged from 41.8 to 94.0 t ha-1. The treatment group receiving RDF coupled with vermicompost and biofertilizer had the highest cane yield, whereas the group receiving absolute control (no fertilizer) had the lowest. Sugar yield is a function of cane yield and followed a similar trend to cane yield. The mean sugar yield varied significantly from 4.5 - 10.5 t ha-1. Brix, pol, purity coefficient and commercial cane sugar was found non-significant. The soil available N (224.33 - 278.92 kg ha-1), available P (22.28 - 36.33 kg ha-1), available K (124.67 - 165.20 kg ha-1) and available S (12.64 - 19.21 mg kg-1) varied significantly due to application of integrated nutrient management in soil. The use of organic and inorganic fertiliser sources over absolute control was also noted as a considerable increase in the Fe, Zn, Cu and Mn content of post-harvest soil. The soil organic carbon stock was found to be non-significant due to the application of nutrients from organic and inorganic fertiliser while the mean soil organic carbon (0.48 - 0.56%), soil microbial biomass carbon (129.10 - 255.90 mg kg-1), and CO2 evolution (36.83 - 60.70 mg 100g-1 soil 24 hr-1) varied significantly. The microflora population in post-harvest soil was significantly higher in treatment receiving RDF along with vermicompost and biofertilizer (Azotobacter and PSB). Due to the impact of various nutrient combinations, the absorption of N (126.97 - 292.58kg ha-1), P (12.54 - 29.96 kg ha-1), and K (114.43 - 271.43kg ha-1) varied significantly. The trend of cane output was similar to the intake of minerals. The effect of various treatment on agronomic use efficiency and physiological use efficiency was varied significantly.ThesisItem Open Access Impact of intensive fertilizer use on soil health under maize based cropping system(Dr.RPCAU, Pusa, 2022) KANDARI, ABHISHEK SINGH; Tiwari, SanjayA study was conducted in the block Khodawandpur (Begusarai) among farmers taking different cropping system (rice-maize, pigeon pea-maize, soybean-maize, maize-wheat and rice-wheat) to study the influence of fertilizer application on soil health. Several soil quality parameters were assessed during the experiment to assess the influence of five cropping systems on soil quality and then it was correlated with the yield of crops in different cropping system. The soil pH variations ranged from 8.01 to 8.26 at the surface layer (0-15cm) and from 8.18 to 8.32 at the sub surface layer (15-30cm). The rice-wheat cropping system had the lowest soil pH (8.01), followed by the rice-maize and pigeon pea-maize cropping system, which might be ascribed to soil submergence during rice cultivation and a higher amount of leaf litter falling over the field throughout crop life of the latter cycle. The range of electrical conductivity variations was determined to be 0.30 to 0.40 dS m-1. The low salt content observed in the pigeon pea cropping system at both soil layers exhibited greater variability than other cropping system. The pigeon pea cropping system has the highest organic carbon content (0.46%), followed by soybean-maize (0.41%) cropping system. The addition of organic carbon and the application of varied doses of inorganic fertilizers caused significant differences in soil available nitrogen in this study under different cropping systems. Nitrogen availability ranged from 137.98 to 178.12 kg ha-1. The maximum quantity of available nitrogen was reported in the pigeon pea cropping system might be attributed to plant biomass deposition and biological nitrogen fixing. Available phosphorus status in soil varied from 31.71 to 44.50 kg ha-1 and it followed the order: pigeon pea-maize>soybean-maize> maize-wheat> rice-wheat> rice-maize. At the surface soil layer, pigeon pea-maize cropping system had the highest soil available potassium (188.84 kg ha-1) and rice-maize cropping system had the lowest (148.24 kg ha-1). Micronutrients varied less in the cropping system. DTPA extractable Fe levels were found to be high in all the cropping systems. DTPA extractable Cu and DTPA extractable Mn were found to be higher in rice-wheat cropping systems, with mean values of 1.93 mg kg-1 and 4.87 mg kg-1, respectively. The large range in Zn concentration in surface soil (0-15cm) was observed under various farming systems. The highest levels of DTPA extractable Zn were found in pigeon pea-maize cropping systems (0.83 mg kg-1). Farmer’s fertilizer and other management techniques may be the reason behind Zn deficiency in soil. The bulk density of the pigeon pea-maize cropping system was found to be lowest (1.37 Mg m-3), whereas rice-wheat had the highest bulk density with a mean value of 1.41 Mg m-3.There was less variation in bulk density among all the cropping system. Relatively high density values were detected in the subsurface layer. Data from several cropping systems revealed that almost all the cropping systems had lower mean values of maximum water holding capacity attributed to intensive tillage and other cultural practices used by farmers. The top layer of a pigeon pea-maize cropping system had the maximum water holding capacity (32.04%), whereas the sub-surface layer of the same cropping system had 28.55%.. Water stable aggregates ranged between 23.23% to 31.03%. The pigeon pea-maize cropping system resulted in the highest mean values (31.03%), whereas the rice-maize cropping system was found to have lowest values (23.23%). Subsurface layer values were found to be lower than surface layer. Soil respiration was highest in the pigeon pea-maize cropping system (1.10 mg CO2 g-1) and lowest in the rice-maize cropping system (0.69 mg CO2 g-1). Organic material was not included during cultural activities in the majority of the farmer’s field resulting in lower soil biological parameters. Cropping systems had active C levels ranging from 169.20 mg kg-1 to 207.93 mg kg-1. In 0-15cm soil depth, the pigeon pea cropping system had the highest mean value, whereas the rice maize cropping system had the least. The dehydrogenase and fluorescein diacetate in the top surface layer ranged from 70.92 to 84.30 (μg TPF g-1 24 h-1) and 2.64 to 4.17 (μg Fluorescein g-1 soil hr-1). Legume based cropping system had the highest dehydrogenase and fluorescein diacetate in the soils of the cropping systems, while rice-maize had the least. The low quantities of dehydrogenase and fluorescein diacetate enzymes found in rice-maize might be linked to low organic carbon content and poor agricultural techniques. Yield of the crops under different cropping system was found to be significantly and positively correlated with most of the soil health parameters but in case of bulk density it was found to be negatively correlated.ThesisItem Open Access Impact of sugarcane cultivation on soil carbon pools and soil health in Samastipur district of Bihar(DRPCAU, PUSA, 2022) KUDI, BABITA; MEENA, SUNITA KUMARIA Study entitled “Impact of sugarcane cultivation on soil carbon pools and soil health in Samastipur district of Bihar’’ was carried out at Department of Soil Science, Dr. Rajendra Prasad Central Agricultural University, Pusa, Samastipur, Bihar with the objective to establish the relationship between soil carbon pools and soil health parameters. Soil samples were analyzed in the laboratory for different physical, chemical and biological properties by Cornell Soil Health Laboratory Comprehensive Assessment of Soil Health (CASH) standard operating procedures. Sugarcane is a long duration, heavy feeder and nutrient exhaustive crop. The excessive and imbalanced use of chemical fertilizer has deterioration of soil health. The soil organic carbon content is continuously declining due to the non-addition of organic matter and to continuous cultivation of sugarcane crop which is extensive in nature. Restoration of organic matter is thus, needed for maintaining soil health and improving productivity through breakdown of continuous cultivation of sugarcane and the addition of organic amendments. A wide variation was observed for soil quality parameters which included pH mean value was 8.35±0.14 in 0-15 cm soil depth and 8.20±0.15 in 15-30 cm; electrical conductivity (EC) mean 0.59±0.18 dS m-1 in 0-15 cm and 0.48 ± 0.18 dS m-1 in 15 - 30 cm; bulk density (BD) mean 1.49 ± 0.10 g cm-3 in 0-15 cm and 1.58±0.08 g cm-3 in 15-30 cm; Wet Aggregate Stability (WAS) mean 26.9±6.6 % in 0-15 cm and 24.67±9.93 % in 15-30 cm. Among the major soil nutrients, the mean value of available N was 192±14 kg ha-1 in 0-15 cm and 187±14 kg ha-1 in 15-30 cm; mean value of available P2O5 was 29.2±5.4 kg ha-1 in 0-15 cm and 25.8±5.2 kg ha-1 in 15-30 cm soil depth; mean value of available K2O was 161±24 kg ha-1 in 0-15 cm and 154±24 kg ha-1 in 15-30 cm soil depth and available S was 8.52±1.40 mg kg-1 at 0-15 cm and 7.30±1.38 mg kg-1 in 15-30 cm soil depth. The variation in available soil micronutrients were as follows: Zn mean value was 0.57 ± 0.21 mg kg-1 in 0- 15 cm and 0.44 ± 0.22 mg kg-1 in 15-30 cm soil depth; Cu mean value was 1.24±0.58 mg kg-1 in 0-15 cm and 1.11±0.59 mg kg-1 in 15-30 cm soil depth; Fe mean value was 9.83±2.58 mg kg-1 in 0-15 cm soil and 8.44±2.52 mg kg-1 in 15-30 cm soil depth; Mn average value was 4.50±0.93 mg kg-1 in 0-15 cm soil and 3.36±0.89 mg kg-1 in 15-30 cm soil depth. Among the soil biological properties, soil protein (autoclaved citrate extractable protein), soil respiration, dehydrogenase activity and MBC mean values were 1.59±0.55 g kg-1, 0.72 ± 0.22 mg CO2 g-1 96 hrs-1, 4.86 ± 0.78 μg TPF hr-1 g-1, 113±15 mg kg-1in 0-15 cm soil and 1.19 ± 0.55 g kg-1 ,0.58 ± 0.23 mg CO2 g-1 96 hrs-1 , 3.59 ± 0.80 μg TPF hr-1 g-1 , 96.63 ± 16.90 mg kg-1in 15-30 cm soil respectively. The mean value of different soil carbon pools were as follows: Walkley-Black carbon was 5.23±1.06 g kg -1 in 0-15 cm soil and 4.56±0.96 g kg -1 in 15-30 cm soil; total organic carbon was 7.64 ± 1.20 g kg-1 in 0-15 cm soil and 7.10±1.49 g kg-1 in 15-30 cm soil; KMNO4 –C was 263±55 mg kg-1 in 0-15 cm soil and 235±54 mg kg-1 in 15-30 cm soil. Percent contribution of different SOC pools to the total SOC followed as: Non labile (32%) > Less labile (28%) > Very Labile (20%) > labile (19.7%) in 0-15 cm of soil and Non labile (35.6%) > Less labile (28.6 %) >Very Labile (18.6%) > labile (17.1%) in 15-30 cm depth of soil. Correlation coefficient of oxidisable organic carbon (0-15 cm soil) with various fractions of carbon and soil biological parameters ranged from 0.846 to 0.974. For 15-30 cm soil depth, correlation coefficient of OC was found significantly positive with TOC (0.925) and VL-C, L-C, LL-C (0.875, 0.899, 0.924, respectively). Therefore, it was recommended that the inclusion of other crops in a crop rotation leads to a build-up of active fractions of carbon, thus the biological activity that will support soil sustainability.ThesisItem Open Access RESPONSE OF INTEGRATED NUTRIENT MANAGEMENT ON ACTIVE POOLS OF SOIL ORGANIC CARBON AND BIOLOGICAL ACTIVITIES UNDER RICE BASED CROPPING SYSTEM(DRPCAU, PUSA, 2022) SHAI, SOURAV; SINGH, PANKAJBeing the backbone of India's food security, the Rice-wheat cropping system is the most profitable and prevailing cropping system in the Indo-Gangetic region, but recently it experienced significant decline in productivity because of depletion in soil organic matter due to low inputs of bio-resources and intensive crop rotation, depletion of soil fertility due to imbalanced use of chemicals and poor residue management leading to its burning. Residue management is a rising concern for better sustainability of Indian agriculture and environmental protection. Intensive cropping systems, lack of traditional use of agricultural crop residues, and lack of buyers of rice is pushing the farmers to opt for residue burning, which causes huge air pollution and global warming. To mitigate such problems IARI introduced a bio-decomposer method known as "Pusa Decomposer" to accelerate the decomposition of paddy straw in the field. Thus, with such background the present study entitled “Response of integrated nutrient management on active pools of soil organic carbon and biological activities under rice based cropping system” was conducted in kharif 2021 and Rice was the test crop at research farm of RPCAU, Pusa, Bihar. The present experiment is third cropping cycle that is kharif 2021 and it was carried out in randomized block design with nine different treatments and each of the treatments were replicated thrice in 3m x 4m plots. The treatments were T1 (100% RDF); T2 (50% N from Residue + 50% RDF); T3 (50% N from Residue + 50% RDF + Pusa Decomposer); T4 (50% N from Residue + 50% N from Green Manure); T5 (50% N from Residue + 50% N from Green Manure + Pusa Decomposer); T6 (Residue @ 2.5 tonnes ac-1 + Pusa Decomposer); T7 (Residue @ 2.5 tonnes ac-1) and T8 (Absolute Control). Bulk density and water holding capacity showed non-significant difference among different treatments under study and similarly, soil pH and EC had no significant impact due to integration of different nutrient sources. However available nutrients in soil had significant effect. Application of fertilizer solely or its integration with CR and/or PD showed a significant increase in available N, P and K, but crop residue incorporation failed to increase available N and P significantly as compared to control treatment whereas, integrated application of GM and CR significantly increased N & P as compared to control. On the other hand available K was significantly increased under residue incorporation i.e., in T6 and T7 compared to absolute control. Active carbon fractions like very labile and labile pools of carbon, Water-soluble organic carbon (WSC), microbial biomass carbon (MBC), acid hydrolysable carbohydrate (AHC) and soil respiration decreased with increase in the depth and all of them recorded higher value in the integrated treatments T3 and T5 and lowest value in absolute control (T8). It was observed that application of Pusa decomposer (PD) both in treatment T3 and T5 recorded increase in active carbon pools as compared to the corresponding treatments viz. T2 and T4 respectively only in surface soil (0-5cm). Grain and straw yield and yield attributing characters like number of panicles per hill, number of filled grains per panicle recorded higher values in treatment T1. The treatment T2 and T3 were found to be statistically at par with T1 whereas, absolute control (T8) showed the lowest values which did not differ statistically with treatments T7 and T6 while, GM addition with CR in treatments T4 and T5 recorded significant increase in grain yield and yield attributes as compared to absolute control. The INM treatments did not significantly affect test weight and harvest index of rice. Plant height of rice during flowering stage and harvesting stage was maximum under treatment T1 (100% RDF) followed by T3 and T2. These treatments show significantly higher plant height as compared to organically treated plots and rest of the treatments i.e., T4 to T8 were statistically at par. Days to 50% flowering recorded non-significant difference among different treatments. The enzymatic activities indicated that the microbial activity in soil, recorded higher values on integration of 50% N from Residue with 50% RDF and Pusa Decomposer (T3) and in treatment T5 with 50% N from Residue + 50% N from Green Manure + Pusa Decomposer (T5) which were found to be significantly higher than T2 and T4 respectively. The research findings indicate that the maximum benefits in terms soil quality or productivity was obtained under integration of 50% fertilizer, crop residue with pusa decomposer i.e. T3 which suggest the replacement of 50% fertilizer with crop residue incorporation and pusa decomposer not only increase yield but also improve soil health which is needed for the development of sustainable systems.
