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Govind Ballabh Pant University of Agriculture and Technology, Pantnagar

After independence, development of the rural sector was considered the primary concern of the Government of India. In 1949, with the appointment of the Radhakrishnan University Education Commission, imparting of agricultural education through the setting up of rural universities became the focal point. Later, in 1954 an Indo-American team led by Dr. K.R. Damle, the Vice-President of ICAR, was constituted that arrived at the idea of establishing a Rural University on the land-grant pattern of USA. As a consequence a contract between the Government of India, the Technical Cooperation Mission and some land-grant universities of USA, was signed to promote agricultural education in the country. The US universities included the universities of Tennessee, the Ohio State University, the Kansas State University, The University of Illinois, the Pennsylvania State University and the University of Missouri. The task of assisting Uttar Pradesh in establishing an agricultural university was assigned to the University of Illinois which signed a contract in 1959 to establish an agricultural University in the State. Dean, H.W. Hannah, of the University of Illinois prepared a blueprint for a Rural University to be set up at the Tarai State Farm in the district Nainital, UP. In the initial stage the University of Illinois also offered the services of its scientists and teachers. Thus, in 1960, the first agricultural university of India, UP Agricultural University, came into being by an Act of legislation, UP Act XI-V of 1958. The Act was later amended under UP Universities Re-enactment and Amendment Act 1972 and the University was rechristened as Govind Ballabh Pant University of Agriculture and Technology keeping in view the contributions of Pt. Govind Ballabh Pant, the then Chief Minister of UP. The University was dedicated to the Nation by the first Prime Minister of India Pt Jawaharlal Nehru on 17 November 1960. The G.B. Pant University is a symbol of successful partnership between India and the United States. The establishment of this university brought about a revolution in agricultural education, research and extension. It paved the way for setting up of 31 other agricultural universities in the country.

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  • ThesisItemOpen Access
    Soil test crop response study in chilli (Capsicum annum L.) for fertilizer recommendation
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2013-06) Deepak; Srivastava, Ajaya
    A field experiment was conducted during spring and summer 2011-12 at Crop Research Centre, G.B.P.U.A. & T., Pantnagar under AICRP on soil test crop response correlation to develop fertilizer adjustment equation for computing nutrient dose for targeted yield of Chilli on the basis of initial soil fertility and nutrient dose. Test crop Chilli was grown using three levels of nitrogen, phosphorus and potassium with control in three different fertility gradient stripes. Twenty four treatments were randomised in each strip and three blocks were made with different organic manure (FYM) level (0 t ha-1, 10 t ha-1 and 20 t ha-1). Chemical analysis was carried out to estimate organic carbon, available nitrogen, phosphorus and potassium in soil. Nutrient requirement to produce one quintal of Chilli was found to be 3.21 kg for nitrogen, 1.57 kg for phosphorus and 3.96 kg for potassium. Percent contribution for nitrogen, phosphorus and potassium was 42.37, 30.65 and 7.7 from soil; 20.57, 36.0 and 56.0 with FYM; 8.0, 35.0 and 51.0 from chemical fertilizer, respectively. Multiple regression type response function were fitted in to the data by selected soil test methods. Response type for nitrogen - + -, while for phosphorus it was + + - type and for potassium it was - - + type. Fruit yield was positively and significantly correlated with plant yield (0.571**), nitrogen uptake (0.611**), nitrogen (.611**) phosphorus (0.620**) and potassium (0.483**). Significant correlation of fruit yield was found with fertilizer nitrogen (0.476**), phosphorus (0.419**) and potassium (0.398**), and FYM (.317**). Suitability of soil test methods were evaluated by R² value of multiple regression equation and concluded that alkaline KMnO4 and Organic Carbon, Olsen’s and AB-DTPA and Normal neutral NH4OAC and AB-DTPA methods are suitable for the determination of available nitrogen, phosphorus and potassium, respectively. These findings may be used as guide for efficient fertilizer management by reducing cost of cultivation and increasing fertilizer use efficiency. Therefore soil test based fertilizer recommendation may be a useful tool for balanced fertilization of nutrients.
  • ThesisItemOpen Access
    Studies on response of cowpea (Vigna unguiculata (L.) Walp) for various irrigation schedules under varying water table conditions
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2013-07) Pandey, Anshul; Kushwaha, H.S.
    Experiment with Cowpea (Vigna unguiculta (L).Walp) (2n= 22) var. Pant Lobia -1 was conducted at N.E. Borlaug Crop Research Center of G. B. Pant University of Agriculture and Technology, Pantnagar (Latitude 290N, Longitude 790 30’ E and Altitude 243.84 m a above msl) to study the effect of irrigation schedule on growth, development, yield and yield attributes, total water use and water use efficiency of Cowpea. The lysimeters under experiment were filled with silty clay loam soil and were associated with 30±1.5, 60±1.5 and 90±1.5 cm water tables. Six irrigation treatments included T1 ( 3 cm irrigation water at IW : CPE ratio 0.3 by flood method) ; T2 ( 2 cm irrigation water at IW : CPE ratio 0.2 by Sprinkler method) ; T3 ( 3 cm irrigation water at IW : CPE ratio 0.2 by flood method) T4 ( 2 cm irrigation water at IW : CPE ratio 0.15 by Sprinkler method) ; T5 ( 3 cm irrigation water at IW : CPE ratio 0.15 by flood method) and T6 (2 cm irrigation water at IW : CPE ratio 0.10 by Sprinkler method) lysimeters associated with water table conditions. The results have shown that Plant height of cowpea var. Pant Lobia-1 was found to be maximum (55.71 cm) in T1 treatment where 6 irrigations were scheduled based on IW : CPE 0.3 using sprinkler method of irrigation .Number of leaves was significantly affected by various irrigation schedules, water table depths and irrigation methods. Maximum number of leaves (30.20, 29.78 and 29.40) were observed under irrigation at IW: CPE 0.3 , 60±1.5 cm water table depth and sprinkler method of irrigation respectively. Number of branches per plant was found significantly higher (1.12, 1.80 and 2.41 at 25, 50 and 75 DAS, respectively) under 60±1.5 cm water table observed . The plots receiving irrigations at IW : CPE 0.10 recorded significantly more number of branches per plant (1.08, 1.88 and 2.54 at 25,50 and 75 DAS respectively). The number of branches per plant was higher (2.41 at 75 DAS) through sprinkler method of irrigation. Maximum leaf area (18.83 cm2) was observed in 90±1.5 cm water table depth. Plots receiving irrigations at IW : CPE 0.10 recorded significantly higher leaf area of 17.72 cm2, while sprinkler method produced significantly maximum leaf area (18.42 cm-2). Days taken to 50 per cent flowering ranges from 48.83 to 38.83 among different irrigation combination treatments in lysimeters under water table condition. Results have also indicated that grain yield in lysimeters with 60 cm water table receiving 6 irrigations using IW: CPE as 0.3 was highest when irrigated with flood method, while the lowest grain yield was obtained in lysimeters associate with 30 cm water table and receiving one irrigation based on IW: CPE 0.15 using flood method. Highest water use efficiency (WUE) 1.73 kg ha-1cm-1 was obtained in lysimeters with 90 cm water table and receiving six irrigation by flood method as IW: CPE 0.3, while it was lowest (0.80 kg ha-1cm-1 ) in irrigation treatments receiving IW: CPE 0.15 using flood method under 30 cm water table. It is concluded from this study that among different irrigation treatments, irrigation schedule based on IW: CPE as 0.3 (six irrigations) was beneficial to the crop under medium water table (60 cm depth)conditions and flood method of irrigation was superior over sprinkler method for maximizing yield (1896.3 kg ha-1) of cowpea.
  • ThesisItemOpen Access
    Effect of P and Zn interaction on growth, yield, nutrient uptake and quality of maize (Zea mays L.) cv. HQPM-1 grown in mollisols
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2013-06) Abhishek Kumar; Singh, Veer
    A field experiment was conducted during kharif 2012 to find out the effect of P and Zn interaction on growth, yield, nutrient uptake and quality of maize (Zea mays L.) cv. HQPM-1 grown in mollisols at Crop Research Centre of G.B. Pant University of Agriculture and Technology, Pantnagar, Uttarakhand. The treatments replicated thrice in a factorial randomized block design (F-RBD) and the experiment consisted of 10 treatments. Growth and yield attributing characters of maize significantly affected by application of various P and Zn levels which in turn increased grain and stover yields of maize. The plant growth parameters viz., plant height and number of leaves was observed highest with the application of 60 kg P2O5/ha along with 15 kg Zn/ha. Days to 50 per cent tasseling and silking were found minimum with the combined application of 15 kg Zn/ha and 60 kg P2O5/ha but anthesis silking interval (ASI) was found minimum under 10 kg Zn/ha and 90 kg P2O5/ha combination which consequently improved grain yield. Interaction effect of 10 kg Zn/ha along with 60 kg P2O5/ha significantly increased cob and grain yield by 59.3 and 48.1 q/ha, respectively, over control (36.3 and 25.0 q/ha). Combined application of 10 kg Zn/ha and 60 kg P2O5/ha in general increased the availability of soil nitrogen, phosphorus, and zinc. Total phosphorus and zinc uptake was found highest under treatment T10 and T5 respectively. Protein, tryptophan and lysine content in maize grain significantly affected with the Zn and P levels and highest values of 20.7, 0.29 and 1.15 %, respectively, were observed with 60 kg P2O5/ha and 10 kg Zn/ha combination. All the yield attributes attained the positive but no-significant correlation with soil pH, EC and available Zn but soil available P showed significant and positively correlation with grain yield (0.680*). Tryptophan and lysine contents of grain were significantly correlated with available P (0.799**, 0.792**), grain P (0.787**, 0.790**) and grain Zn (0.755*, 0.789**), respectively. Among all the treatments, combined application of 10 kg Zn/ha and 60 kg P2O5/ha (T6) was found superior over other treatments for most of the growth, yield and quality parameters.
  • ThesisItemOpen Access
    Effect of integrated nutrient management in pigeon-pea based intercropping system on soil properties, growth and yield of pigeon-pea, black-gram, maize on mollisols of the tarai region
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2010-01) Singh, Ashutosh; Mishra, H.S.
    A field experiment were conducted during kharif season of 2007 and 2008 at N. E. Borlaug Crop Research Centre, G. B. Pant University of Agriculture and Technology, Pantnagar, Uttarakhand to study the effect of integrated nutrient management in pigeon-pea based intercropping system on soil properties, growth and yield of pigeon-pea, black-gram, maize on Mollisols of the Tarai region. Treatments comprised 3 cropping system (sole pigeon-pea, pigeon-pea + black-gram and pigeon-pea + maize), 2 inoculation (PSB-inoculation and uninoculation) and 3 levels of FYM (0, 2.5 and 5.0 t ha-1). Eighteen treatment combinations were replicated three times in a factorial randomized block design. The soil was sandy loam in texture, medium in organic carbon (0.81%), low in available N (199.8 kg ha-1), and medium in available P (17.2 kg ha-1) and available K (219.7 kg ha-1) contents with pH 7.2. The crop pigeon-pea ‘UPAS-120’, black-gram ‘PantUrd-40’ and maize ‘Surya’ was sown on 2nd and 16th July during 2007 and 2008, respectively. A basal dose of 20 kg N, 40 kg P2O5 and 30 kg K2O ha-1 for pigeon-pea and black-gram and for maize 60 kg N, 60 kg P2O5 and 40 kg K2O ha-1 was furrow placed at the time of sowing and half dose (60 kg N) for maize was applied 30 and 50 days after sowing. Seed of pigeon-pea and blackgram were inoculated with PSB (Bacillus polymyxa) @ 20 g culture kg-1 seed before sowing. Intercrop was harvested 110 and 105 DAS (black-gram) and 94 and 83 DAS (maize) during 2007 and 2008, respectively. The pigeon-pea crop was harvested on 29th December in 2007 and 30th December in 2008. Most of the growth parameters viz. plant height, branches, dry matter production, nodules number and their weight, yield attributes and yield of pigeon-pea were significantly higher under pigeon-pea + black-gram cropping system. Similar results were also obtained with PSB-inoculation and FYM @ 5.0 t ha-1 for all crops. Pigeon-pea grain equivalent yield was reported significantly higher under pigeon-pea + black-gram cropping system followed by pigeon-pea + maize and sole pigeon-pea. Protein content and yield in pigeon-pea increased under pigeon-pea + black-gram cropping system. PSB-inoculation and 5.0 t FYM ha-1 were also increased the protein content and yield in pigeon-pea and black-gram. Nutrient concentration (N, P and K) in plant parts and its uptake by crop of pigeon-pea were maximum under pigeon-pea + black-gram cropping system followed by sole pigeon-pea and pigeon-pea + maize cropping system. PSB-inoculation and FYM application @ 5.0 t ha-1 increased the nutrient content (N, P and K) and its uptake by all the crops at all the growth stages. Pigeon-pea + black-gram cropping system, PSB-inoculation and FYM @ 5.0 t ha-1 significantly increased microbial population and dehydrogenase activity in soil after the harvest of pigeon-pea. There was no significant effect of the treatments on soil pH and EC. PSB-inoculation non-significant increased the organic carbon, available N and K in soil but significantly increased the available P in soil. However, available N, P and K content significantly increased by intercropping system, PSB-inoculation and FYM application while available K in soil did not significant increased by FYM application. Application of different treatments did not affect physical properties of soil significantly after harvest of pigeon-pea over control in both the years. Finally, pigeon-pea + black-gram cropping system supplied with PSB-inoculation and FYM @ 5.0 t ha-1 was found to be suitable in terms of both soil health and crops performance which Needs further investigation to be recommended to field level.
  • ThesisItemOpen Access
    Effect of tillage and irrigation on growth and yield of wheat (Triticum aestivum l.) and their simulation studies using Ceres-Wheat Model
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2013-08) Mishra, Gaurav; Kushwaha, H.S.
    Field experiments were conducted in sandy loam soil at Norman E. Borlaug Crop Research Centre of G. B. Pant University of Agriculture and Technology, Pantnagar (Latitude 290 N, Longitude 79030´ E and Altitude 243.84 m above msl) during rabi seasons of 2011-12 and 2012-13 to study effect of tillage and irrigation on growth and yield of wheat cv. UP-2565 and its simulation studies using CERES-wheat model. The experiment was laid out in 2 factorial RBD design with first factor i.e. three tillage practices viz. zero tillage (ZT), conventional tillage (CT) and deep tillage (DT) and second factor i.e. five irrigation treatments viz. irrigations at crown root initiation (CRI) stage , I1; CRI + late jointing (LJ) stage, I2; CRI + LJ + milking (M) stage, I3; CRI + late tillering (LT) + flowering (F) stage + M, I4 and CRI + LT + LJ + F + M, I5 of the wheat crop with three replications. The observations were recorded on soil properties viz. infiltration rate, B.D, hydraulic conductivity, pH, EC, O.C, Available N, P and K, growth and development parameters viz. Plant height, LAI, root length density, no. of tillers, days to anthesis and days to physiological maturity, wheat (grain & biological) yield and yield attributes viz. spike length, no. of spike, grains per spike and 1000-grain weight under various tillage practices and irrigation schedules and simulation of some of these was also done using CERES-wheat model. Results indicated that tillage and irrigation significantly affect the infiltration rate, B. D., hydraulic conductivity, O.C. and available N in soil, while soil pH, EC, available P and K did not differ significantly with these treatments. Highest plant height 115.5 and 115.6 cm was recorded with DT and I5 in 2012-13, LAI 3.39 and 3.68 with DT and I4 in 2011-12, root length density 1.41 and 1.49 in DT and I5 in 2011-12 at 0-15 cm. Maximum no. of tillers and days to anthesis of wheat were recorded with CT and I5 while days to physiological maturity with DT and I5 during both crop seasons. Maximum spike length obtained in CT (7.85 and 7.79) and I4 (7.97 and 7.90), number of grain spike-1 in CT (34.2 and 29.0) and I5 (35.2 and 30.0) and 1000-grain weight in CT (38.0 and 40.0 gm) and I4 (39.4 and 40.6 gm) during both the crop seasons. The highest grain yields of 3438.3 and 3933.3 kg ha-1 respectively were recorded with CT in 2011-12 and 2012-13, while I5 (3602.7 kg ha-1) in 2011-12 and I4 (4173.6 kg ha-1) in 2012-13. Biological yield was maximum under DT (11700.0 kg ha-1) and I4 (11972.2 kg ha-1) during 2012-13. Significantly higher harvest index was obtained under DT (44.5%) and I1 (42.9%) in 2011-12. The analyzed data of experiments have shown that maximum observed LAI (3.80) was obtained during 2011-12 against simulated (3.24) in CTI4. Number of tillers m-2, days taken to anthesis and days to physiological maturity were underestimated during both the wheat crop seasons. Model simulated the grain and biological yield and higher efficiency (R2=0.72 for grain yield and R2=0.92 for biological yield) was obtained in 2011-12 in comparison to 2012-13. The harvest index of wheat was overestimated under some treatments during both the crop season. It is concluded from this study that in sandy loam soil the use of CT along with four irrigations (CRI + LT + F + M) gave maximum wheat yield. The CERES model simulated growth and yield of wheat with reliable precision during both years. In simulating most of wheat crop characters the model was observed to be more efficient in 2011-12 than 2012-13. The CERES wheat model has tremendous potential in predicting the yield of wheat crop under diverse agro climatic conditions especially in the locations where capital is the main constraint in conducting the field experiments and providing of the necessary lab facilities and lack of water for irrigation.
  • ThesisItemOpen Access
    Evaluation of some multinutrient extractants for assessing availability of micronutrient cations in acidic soils of Uttarakhand
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2012-12) Joshi, Dibya; Srivastava, P.C.
  • ThesisItemOpen Access
    Simulation of growth and yield of wheat (Triticum aestivum L.) and soil moisture using Ceres Wheat Model in Bhabhar and Tarai agro-climatic zone of Uttarakhand
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2011-08) Khanday, Ab Shakoor; Kushwaha, H.S.
    Field experiments were conducted at Norman E. Borlaug Crop Research Center of G.B. Pant University of Agriculture and Technology, Pantnagar (Latitude 290 N, Longitude 79030´ E and Altitude 243.84 m above msl) during rabi seasons of 2009-10 and 2010-11 to simulate the effect of various irrigation treatments on growth and yield of wheat (Triticum aestivum L.) and soil moisture using CERES-wheat model in Bhabar and Tarai agroclimatic zone of Uttarakhand. Experiment was laid out in RBD under five irrigation treatments viz. irrigations at crown root initiation (CRI) stage , I1; CRI + late jointing (LJ) stage, I2; CRI + LJ + milking (M) stage, I3; CRI + late tillering (LT) + flowering (F) stage + M, I4 and CRI + LT + LJ + F + M, I5 of the wheat crop with three replications. The analyzed data of experiments have shown that maximum simulated (3.98) and observed (5.01) LAI was obtained at 90 DAS during 2010-11 compared with 2009-10. Days taken to anthesis were underestimated during the 2009-10 and were overestimated during 2010-11. Model simulated the days to physiological maturity better (R2=0.948) in all the treatments during 2010-11. The days to harvesting maturity under all the irrigation treatments were underestimated by the model during both the years. A slightly higher efficiency of model (R2=0.674) was obtained in 2010-11. The harvest index was also overestimated under all the treatments except I2 during 2009-10 and I4 in 2010-11 crop season. The decrease in observed soil moisture content with increase in the soil depth was simulated well by the model under all the irrigation treatments. The perfect match between simulated and observed soil moisture content was observed at 130 DAS under I2 at 45-60 cm and at 104 DAS under I5 treatment at 15-30 cm soil depth during 2009-10. The extractable soil moisture (ESM) was simulated best at 62 DAS under I3 during 2009-10 and at 20 DAS under same treatment during 2010-11. The model was found to perform most efficiently in predicting the TPSM at 130 DAS under I2 treatment during 2009-10 and at 44 DAS under I4 treatment during 2010-11. Results have shown that maximum root length density (1.31 cm cm-3) was obtained under I5 treatment at 0-30 cm soil depth at 90 DAS during 2009-10. Higher value of shoot count (365.62 m-2) was obtained under I5. Significantly more number of days to anthesis (80.00 and 88.33) ,physiological maturity (117.67 and 127.33 ), harvesting maturity (137.00 and 151.00), grain yield (49.21 and 48.90 q ha-1), straw yield (104.23 and 104.90 q ha-1), biological yield (153.44 and 153.80 q ha-1) and water use (41.89 and 46.97 cm) were obtained under I5 during 2009-10 and 2010-11 crop seasons. Significantly more spike length (10.05 and 11.03 cm ) and 1000 grain weight (38.02 and 38.70 g) was recorded under I5 and I4 during 2009-10 and 2010-11, respectively. The effect of different irrigation treatments on the grain weight per spike was found to be non-significant during both of the crop seasons. It is concluded from this study that CERES model simulated growth, development and yield of wheat with reliable precision during both years. In simulating most of wheat crop characters the model was observed to be more efficient in 2010-11 than 2009-10, which may be attributed to the increased crop duration, well distributed rainfall and relatively lower atmospheric temperature during 2010-11. The CERES wheat model has tremendous potential in predicting the yield of wheat crop and soil moisture under diverse agro climatic conditions especially in the locations where capital is the main constraint in conducting of the field experiments and providing of the necessary lab facilities.
  • ThesisItemOpen Access
    Isolation, characterization, N2 fixing efficiency of Azotobacter strains and their effect on finger millet [Eleusine coracana GAERTN.] and soil quality
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2010-06) Upadhyay, Sandeep; Narendra Kumar
  • ThesisItemOpen Access
    Effect of nutrient management and postemergence herbicides on Glycine max-Rhizobium symbiosis and soil properties
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2011-09) Das, Shrila; Narendra Kumar
    Two field experiments were conducted during kharif season of 2008-09 on soybean variety PS1347 at the Norman E. Borloug Crop Research Center of G.B. Pant University of Agriculture and Techonology, Pantnager (Uttarakhand) and one laboratory experiment to evaluate the “Effect of nutrient management and post-emergence herbicides on Glycine max - Rhizobium symbiosis and soil properties” In first experiment, 50% organic + 50% inorganic nutrient sources showed highest nodule number, nodule dry weight, significantly more plant dry weight and grain yield of 1797.91 kg ha-1 and straw yield of 3106.94 kg ha-1 over 100 % organic treatment. This treatment also recorded highest N and P content in grain and straw as well as uptake of N (121.61 kg ha-1) by grain and straw (58.12 kg ha-1) and uptake of P (11.85 kg ha-1) by grain and by straw (13.83 kg ha-1). Maximum number of soil bacteria (23.20 X 107 CFU g-1 soil) and actinomycetes (46.84 x 106 CFU g-1 soil) was found in 50 % organic + 50 % inorganic treatment at 60 DAS. However, maximum fungal population (13.75 x 105 CFU g-1 soil) was recorded after harvest. This treatment also gave higher number of soil rhizobia and PSB than 100 % inorganic treatment at both the intervals. The highest soil available N (286.94 kg ha-1), P (23.46 kg ha-1) and K (139.03 kg ha-1) were recorded in 50 % organic + 50 % inorganic treatment. 100% inorganic and INM+IPM treatments were better than 100% organic for nodule number, nodule dry weight, plant dry weight, yield and N and P content and uptake, but soil microbial population, microbial biomass and dehydrogenase activity were higher in 100% organic treatment than 100% inorganic and INM + IPM treatments. The cropping systems did not significantly affect nodule number, nodule dry weight, grain and straw yields, and N and P content and uptake. However, significantly more plant dry weight was recorded in soybean-chickpea cropping system than soybean-wheat. The population of soil rhizobia and phosphate solubilizing bacteria (PSB), microbial biomass carbon were significantly higher in soybean-chickpea cropping system in comparison to soybean-wheat system after harvest. The cropping systems did not show significant effect on soil organic carbon, pH, electrical conductivity, bulk density and available N, P and K. Interactions between nutrient management and cropping systems were significant for nodule number at 60 and 90 DAS, nodule and plant dry weight at 30 and 90 DAS, grain and straw yields, N content and uptake by grain and straw, P content and uptake by grain. Significant interactions between nutrient management and cropping systems was also recorded for total soil bacteria, actinomycetes and PSB population after harvest, total fungal, rhizobial population and microbial biomass carbon and dehydrogenase activity in soil at 60 DAS and after harvest. In second experiment, maximum nodule number per plant, nodule and plant dry weight, grain yield of 2185.17 kg ha-1 and straw yield of 3018.50 kg ha-1 were found in two hand weeding treatment, while weedy check control showed minimum. The uptake of N and P by grain and straw was significantly more in two hand weeding treatment than all other treatments. This treatment also showed maximum number of soil microorganisms including rhizobia, PSB, microbial biomass carbon and dehydrogenase activity at 60 DAS as well as after harvest. By increasing concentration of haloxyfop ethyl 10 EC from 75 to 100 g a.i. ha-1, decline in soil microbial population, microbial biomass carbon and dehydrogenase activity were recorded at 60 DAS as well as after harvest. Among herbicides, fenoxyprop ethyl 9 EC @ 100 g a.i. ha-1 was found most effective in controlling weeds in soybean and showed better nodulation, plant growth, yield, nutrients uptake and soil health parameters. In third experiment, the increase in concentration of herbicides significantly reduced the population of Bradyrhizobium japonicum and PSB (except 0.3 and 0.4 per cent concentration). Maximum number of Bradyrhizobium japonicum (110.66 X 104 CFU mL-1) and PSB (84.73 X 104 CFU mL-1) was recorded in the control and minimum of 19.57 X 104 CFU g-1 soil and 14.69 X 104 CFU mL-1 soil at 0.5 per cent concentration, respectively.