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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
    Effect of irrigation on growth, yield and water requirement of wheat ( Triticum aestivum L. ) under varying water table conditions
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2009-06) Jha, Kanchan; Kushwaha, H.S.
    Lysimeter and field experiments with Wheat crop var. UP-2425 were conducted at Crop Research Centre of G.B. Pant University of Agriculture and Technology, Pantnagar (Latitude 29 oN, Longitude 79o 30` E and Altitude 243.84 m amsl) to know the effect of various irrigation treatments on growth, yield and water use by wheat crop during rabi season of 2007-08. Six irrigation treatments in lysimeters associated with three water tables viz; 30, 60 and 90 cm included I0 (rainfed), I1 (irrigation at 21 DAS), I2 (irrigation at 21 and 65 DAS), I3 (irrigation at 21, 45 and 80 DAS), I4 (irrigation at 40 per cent depletion of available soil moisture (ASM) and I5 (irrigation at 60 per cent depletion of ASM) in lysimeters as well as in field experiments. The analysis of data in lysimeter with six irrigation schedule, three water tables and in field with six irrigation treatment revealed that the optimum water use with irrigation at 40 per cent depletion of ASM in lysimeter with 60 cm water table was 636.06 mm and 329.09 mm, respectively for better growth and development as well as for higher wheat yield. Maximum height of the crop (91.57, 86.96 cm, respectively), maximum number of leaves per plant (8.90, 7.05) and maximum number of tillers per plant (1.10, 1.58 respectively) were observed for irrigations scheduled at 40 per cent depletion of ASM and 60 cm water table and under field experiment at 135 DAS. The results also showed that minimum days required for 50 per cent flowering were 81.00, 79.62 days and for 75 per cent flowering 82.50, 82.75 days, respectively. However, the optimum grain yield was observed to be 53.06, 38.83 q ha-1 with irrigation at 40 per cent depletion of ASM in lysimeters and in field conditions, respectively. The interaction effect studied between irrigation schedules and water table served to be significant for both yield and water use efficiency in lysimeter and field plots.
  • ThesisItemOpen Access
    Soil test crop response studies on integrated nutrient management in direct seeded rice – wheat cropping sequence
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2019-12) Singh, Vijay Kant; Gautam, Poonam
    Field experiments were conducted as per technical programme of AICRP on STCR in B2 block of Norman E. Borlaug Crop Research Centre, G.B. Pant University of Agriculture and Technology, Pantnagar, (290 N latitude, 79029’ E longitude and 243.84 meters above MSL), from rabi 2016-17 to 2018-19 to work out soil test crop response based fertilizer nutrient requirement for targeted yield of direct seeded rice and wheat in sequence. Prior to test crop experiment whole experimental area was divided into three equal strips and soil fertility gradient created artificially by applying graded doses of nutrients in these strips and wheat was grown as an exhaust crop during rabi 2016-17. Test crop of direct seeded rice and wheat in sequence were grown during 2017-18 after dividing each strip in 24 plots (21 treatments and 3 controls). Crop response to selected combinations of four levels of nitrogen (0, 60, 120 and 180 kg N ha-1), four levels of phosphorus (0, 30, 60 and 90 kg P2O5 ha-1), four levels of potassium (0, 20, 40 and 60 kg K2O ha-1) and three levels of FYM (0, 5 and 10 t ha-1) in different fertility strips was studied. After test crop experiment, verification experiment was also conducted during 2018-19 to study the effect of nutrient management practices on yield, nutrient content, uptake, fertilizer economics, nutrient use efficiency and soil fertility in direct seeded rice-wheat cropping sequence. The value of soil organic carbon, alkaline KMnO4-N, Olsen’s-P and NH4OAc-K ranged between 0.314 to 0.971 percent, 125.44 to 200.70 kg ha-1, 14.37 to 21.74 kg ha-1 and 122.08 to 173.60 kg ha-1, respectively before the test crop experiment on direct seeded rice while, before test crop wheat, these values ranged between 0.457 to 0.886 percent, 112.90 to 238.34 kg ha-1, 13.63 to 24.32 kg ha-1 and 133.28 to 212.80 kg ha-1, respectively. Grain yield of direct seeded rice and wheat varied from 22.73 to 67.05 and 6.82 to 64.77 q ha-1, respectively. Average uptake of N, P and K by direct seeded rice was 87.64, 19.25 and 131.55 kg ha-1 while, in wheat it was 84.76, 17.24 and 84.15 kg ha-1, respectively. Nutrient requirement to produce one quintal grain yield of direct seeded rice was 2.01 kg N, 0.440 kg P and 3.06 kg K while for wheat 2.16 kg N, 0.447 kg P and 2.29 kg K. Percent contribution of N, P and K from soil was 22.05, 37.34 and 41.48 in direct seeded rice and 12.02, 14.82 and 11.00 in wheat, respectively. Whereas, from FYM it was 23.25, 28.34 and 16.80 percent in direct seeded rice, 12.83, 19.48 and 35.07 percent in wheat for N, P and K, respectively. Percent contribution of N, P and K from fertilizer was 38.08, 49.93, 252.98 in direct seeded rice and 53.54, 60.24 and 231.84 in wheat, respectively. Percent contribution from combined use of fertilizer and FYM was 44.83, 60.57 and 278.70 in direct seeded rice and 60.26, 70.66 and 275.41 in wheat for N, P and K, respectively. Fertilizer nutrient prescription equations for targeted yield of direct seeded rice and wheat were developed with and without FYM and it was found that for a particular yield target fertilizer nutrient requirement decreased with increasing soil test values, however for a particular soil test value nutrient requirement increased with increasing yield targets. Application of FYM reduced the fertilizer nutrient requirement for both the crops. Coefficient of determination was found highly significant (0.341** in direct seeded rice and 0.880** in wheat) by taking grain yield as dependent variable, while soil test values, added fertilizer nutrients and their interactions as independent variables. Post harvest prediction equations were also developed for predicting soil test value for available N, P and K after direct seeded rice, after wheat and after whole sequence. Less deviation was found between observed and predicted soil test value indicated the validity of post harvest soil test equations. Results of verification experiment clearly indicated the superiority of STCR target yield approach over other nutrient management practices to improve yield, economics and soil fertility in direct seeded rice-wheat cropping sequence. Therefore, findings of present study may be used for fertilizer nutrient prescription in similar type of soils and climate after its verification at farmer’s fields.
  • ThesisItemOpen Access
    Effect of foliar and soil application of nutrients on yield, nutrient uptake and soil nutrient status in rice crop
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2019-08) Martolia, Ankita; Pant, A.K.
    The experiment entitled “EFFECT OF FOLIAR AND SOIL APPLICATION OF NUTRIENTS ON YIELD,NUTRIENT UPTAKE AND SOIL NUTRIENT STATUS IN RICE CROP ” was undertaken during kharif season of 2018 at Norman E. Borlogue Crop Research Centre of G.B. Pant University of Agriculture and Technology, Pantnagar (290 N latitude and 790 29’ E longitude). Ten different treatments viz. T1-Control(No fertilizer), T2-50% Recommended Dose of Fertilizer (60:30:20)kg N,P2O5,K2O/ha, T3-75% Recommended Dose of Fertilizer(90:45:30)kg N,P2O5, K2O/ha, T4-100% Recommended Dose of Fertilizer(120:60:40)kg N,P2O5,K2O/ha, T5-50% Recommended Dose of Fertilizer+foliar spray @ 0.5% urea at tillering, panicle initiation and heading stage, T6-75% Recommended Dose of Fertilizer+foliar spray @0.5% urea at tillering, panicle initiation and heading stage, T7-100% Recommended Dose of Fertilizer+foliar spray @ 0.5%urea at tillering, panicle initiation and heading stage, T8-50% Recommended Dose of Fertilizer +foliar spray @ 1% urea at tillering, panicle initiation and heading stage, T9-75% Recommended Dose of Fertilizer+foliar spray @ 1% urea at tillering, panicle initiation and heading stage, T10- 100% Recommended Dose of Fertilizer+foliar spray @ 1% urea at tillering, panicle initiation and heading stage with three replications were laid out in randomized block design. Soil and crop parameters of rice were taken studied and analyzed to achieve the objectives of the experiment. In this experiment urea was used for foliar spray. The rate of urea applied was 2.3 kg/ha for 1% urea and 1.15 kg/ha for 0.5% urea at tillering, panicle initiation and heading stage. The result showed that soil and foliar application of nitrogen significantly influenced the growth and yield attributing characters viz. dry matter accumulation, no. of effective tillers per plant, no. of grains per panicle, 1000 grain weight, grain yield, straw yield. Plant height was found highest in T7. The treatment T10 produced the highest grain yield (5.4 t /ha).The treatment T7 produced the highest straw yield (6.9 t /ha) of the crop. The lowest grain yield of (2.95 t/ha) and lowest straw yield of (4.54 t /ha) were recorded in treatment T1 (control).The N, P, K concentrations of rice grain and straw influenced significantly by soil and foliar application of urea. Soil properties i.e. pH, EC and organic carbon status after harvest were found non-significant with different treatments. Available N, P and K status were 274 kg /ha, 24.1 kg /ha and 114 kg /ha before sowing and the maximum soil available nitrogen (294.2 kg /ha), phosphorus (31.1 kg /ha) and potassium (134.9 kg /ha) status after harvest was recorded with treatment T10.The agronomic efficiency and partial factor productivity was maximum in treatment T5. The overall results demonstrated that T10 treatment was better for obtaining higher grain yield, straw yield, higher NPK content of rice, soil nutrient status. Hence, soil application of recommended dose of urea can be replaced by soil application of urea coupled with three times foliar spray of urea solution for sustainable rice yield.
  • ThesisItemOpen Access
    Effects of long term fertilization on rice and wheat productivity, nutrients uptake, physico-chemical and biological properties of soil in relation to weather conditions
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2019-08) Vineet Kumar; Shri Ram
    A Study was conducted during 2016-17 to assess the soil quality and relationship between soil quality indices with crop productivity in an ongoing long term fertilizer experiment at Norman. E. Borlaug Crop Research Centre, G. B. Pant University of Agriculture and Technology, Pantnagar. To achieve the objectives of the study soil samples were collected from each plot from 0-15, 15-30, 30-45 and 45-60 cm depth after harvesting of rice and wheat crops and were analyzed for soil physico-chemical and biological properties. Results showed that continuous application of 100% NPK in combination with FYM@ 15 t ha-1 gave highest grain yield of rice (51.87 q ha-1) and wheat (48.60 q ha-1) which was significantly higher than all other fertilizer treatments. The soil organic carbon declined in control up to one third (0.62 per cent) from initial organic carbon (1.48%), whereas combined use of NPK fertilizers and FYM restored its initial status. Availability of all macro and micro nutrients was decreased with the increase in soil depths. Avoiding P, K and Zn application with continuous cropping, drastically reduced their availability in soil in both surface and subsurface soil. Physical properties of soil viz. BD, WHC, SHC and MWD were also improved with integrated nutrient management system. Soil biological properties were better under 100% NPK+FYM @ 15 t ha-1 compared to alone mineral fertilizer application and control. Highest soil dehydrogenase enzyme activity (353.61 and 365.22 μg TPF 24 h-1 g-1 soil) was observed in FYM amended treatment followed by balanced application of fertilizers (312.64 and 327.02 22 μg TPF 24 h-1 g-1 soil) after rice and wheat harvest, respectively. Physical, Chemical and Biological indices and soil quality after rice and wheat harvest with balanced and imbalanced alone mineral fertilizer or with FYM was significantly correlated with each other as well as productivity of rice and wheat crops. Available Zn content showed significant regression coefficient for contribution in improving the yields of both rice and wheat. A good soil quality index values were observed under 100% NPK+FYM and balanced application of fertilizer treatments (100% NPK+Zn). Continuous increase in minimum temperature and decrease in bright sunshine hours believed to decrease rice and wheat grain yield. Similarly SOC, available NPK decreased and bacterial population in soil increased by all fertilizer treatments as compared to control. The results indicated that integrated use of chemical fertilizer along with FYM and balanced use of fertilizer nutrients for rice-wheat cropping on a Mollisols is a sustainable nutrients management practice to the farmers.
  • ThesisItemOpen Access
    Zinc bio-fortification and yield enhancement of urdbean (Vigna mungo L.) through nutrient mobilizing microorganisms
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2019-08) Tewari, Girja Shanker; Pareek, Navneet
    A field experiment comprising eleven treatments was conducted during kharif season of 2017 and 2018 at N. E. Borlaug Crop Research Centre of Govind Ballabh Pant University of Agriculture & Technology, Pantnagar (Uttarakhand) to study on zinc bio-fortification and enhancement of urdbean (Vigna mungo L.) productivity through nutrient mobilizing microorganisms. The experiment was laid out in Randomized Block Design with three replications. Two Zn solubilizing fungal strains from Zn deficient soils (Aspergillus sp. and Penicillium sp.) and two bacterial strains (B. megaterium and B. subtilis) were procured and tested for their P and Zn solubilizing abilities both qualitatively and quantitatively. Changes in pH of medium were observed over a period of 15 days incubation due to secretion of organic acid by the strains. Maximum drop in pH (4.4) was observed with Aspergillus sp. Qualitative and quantitative assays revealed that Penicillium sp. was found most powerful and significant mobilizer among the four cultures in case of both P and Zn solubilization. Results revealed that root nodulation viz. number and dry weight of nodule was maximum with T11 (Rhizobium + Zn Nm + PGPR + ZnO @ 28.0 kg/ha + RDF) at all the stages of plant growth. The maximum plant height at 30, 45, 60 DAS and plant dry weight at 30 DAS was recorded in T11 (Rhizobium + Zn Nm + PGPR + ZnO @ 28.0 kg/ha + RDF) while, maximum plant dry weight at 45 and 60 DAS was noted in T10- Rhizobium + Zn Nm + PGPR + ZnO @ 14.0 kg/ha + RDF. Maximum average and significant yield attributes viz., number of seed per pod (6.00 seed/pod) and 1000-seed weight (33.60 g) was noted from T11 (Rhizobium + Zn Nm + PGPR + ZnO @ 28.0 kg/ha + RDF) whereas, T7- Rhizobium + Zn Nm + PGPR + RDF resulted in longest pods (4.98 cm) and T10 Rhizobium + Zn Nm + PGPR + ZnO @ 14.0 kg/ha + RDF recorded maximum number of pod per plant (51.67 pods per plant). The maximum average grain yield, straw yield and harvest index i.e. 1219.4, 1337.5 kg ha-1 and 47.7 % were found under T11 (Rhizobium + Zn Nm + PGPR + ZnO @ 28.0 kg/ha + RDF) treatment. A significant increase in N, P and Zn content and uptake by grain and straw was also recorded under T11 (Rhizobium + Zn Nm + PGPR + ZnO @ 28.0 kg/ha + RDF). Significant effect of zinc bio-fortification and combined application of nutrient mobilizers has been observed on available N, P, K, S, Zn and organic carbon in soil and maximum numerical value was recorded with the treatment T11 (Rhizobium + Zn Nm + PGPR + ZnO @ 28.0 kg/ha + RDF). The microbial analysis of soil suggested that maximum Actinomycetes (5.49 x 105 CFU g-1 soil) and fungal (12.78 x 104 CFU g-1 soil) population was observed in T7- Rhizobium + Zn Nm + PGPR + RDF, bacterial population (17.29 x 107 CFU g-1 soil) in T8 (Zn Nm + PGPR + T3), while, highest soil dehydrogenase activity (87.84 μg TPF/ 24 hr/ g soil) was noted from T10- Rhizobium + Zn Nm + PGPR + ZnO @ 14.0 kg/ha + RDF.
  • ThesisItemOpen Access
    Response of irrigation on water requirement of european dill (Anethum graveolens Linn.) under varting water table conditions
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2006-06) Pradhan, Yudhishthira; Gupta, O.P.
    A lysimeter experiment with European dill crop at Crop Research Centre of G.B. Pant University of Agriculture and Technology, Pantnagar during Rabi season of 2004-05 with six irrigation schedule viz., I0 (rain-fed), I1 (irrigation at 21 DAS), I2 (irrigation at 21 and 42 DAS), I3 (irrigation at 40 per cent depletion of ASM), I4 (irrigation at 60 per cent depletion of ASM) and I5 (irrigation at 80 per cent depletion of ASM), three water table viz., W1(30 cm), W2(60 cm) and W3(90 cm) was conducted. Analysis of results showed that of six irrigation schedules, three water tables the optimum water requirement (785.67 mm) was at irrigation at 40% depletion of ASM and 60 cm water table for better growth and development and higher yield and yield attributes. Maximum height of the crop (154.65), number of leaves per plant (719.20), leaf area (0.965 cm2) was observed for irrigation schedule at 40% depletion of ASM and 60 cm water table at 150 DAS. Maximum number of umbels per plant (15.97), umbellates per umbel (39.17) and branches per plant (2.75) was observed at 60 cm deep water table. The results also showed that minimum days required for 50 % flowering is 97 days and for 75% flowering was as 107.50. Grain yield was observed to be optimum at 60 cm water table (28.56 q/ha) with irrigation at 40% depletion of ASM. The optimum dry matter yield (32.34 q/ha) was observed at 60 cm water table. The crop coefficient for European dill was maximum (1.87) for 30 cm water table, followed by 60 cm water table (1.80) and minimum for 90 cm water table (1.65). The interaction effect studied between irrigation schedules and water table served to be significant for yield and water use efficiency being maximum (3.635) for 60 cm water table with irrigation at 40 % depletion of ASM.
  • ThesisItemOpen Access
    Effect of puddling on soil properties and performance of rice crop
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2005-03) Girdhari Lal; Tripathi, R.P.
    A field experiment was conducted at the Crop Research Centre of G. B. Pant University of Agriculture and Technology, Pantnagar, District U. S. Nagar (Uttaranchal) to evaluate the effect of puddling on soil properties and performance of rice crop. The experiment was laidout in Split plot design with five puddling levels viz., 1 pass (PR1), 2 passes (PR2), 3 passes (PR3), 4 passes (PR4) and 5 passes (PR5) of rotavator as main plot treatments and residue incorporation (RI) and residue removal (RR) as subplot treatments in four replications. Results showed that puddling raised rice yield upto 4 -passes of rotavator but greatly altered soil physical properties which may not be advantageous to the following non-rice crop. Puddling significantly increased puddling index (58 to 81 per cent),and bulk density (1.43 to 1.57Mg/m3) and decreased porosity (45.94 to 40.46 percent), infiltration rate (20.86 to 9.25mm/d) and saturated hydraulic conductivity (21.16 to 13.39mm/d). The grain yield of rice (6237 kg/ha) was maximum under 4-passes of rotavator but was statistically equal to that obtained under 3-passes of rotavator. The lowest grain yield (5540 kg/ha) was observed under 1-pass of rotavator
  • ThesisItemOpen Access
    Evaluation of Azotobacter strains for nitrogen fixation, survival, soil fertility, plant growth and nutrient uptake by maize (Zea mays L.)
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2005-01) Gupta, Shilpi; Singh, H.P.
    Laboratory and greenhouse studies were undertaken to isolate, characterize and identify different strains of Azotobacter (AZO) isolated from soil. Relative performance of isolated strains and responses to inoculation with efficient Azotobacter strain and graded doses of fertilizer nitrogen with or without FYM addition were assessed in terms of plant height, fresh and dry weight of root and shoot of maize, N uptake, microbial population in soil and available N, P and K in soil at 60 and 70 days after sowing (DAS). Based on cultural, morphological and biochemical characteristics, 19 strains of Azotobacter were isolated which differed in nitrogen fixing capacity to a great extent under bacteriologically controlled condition ranging from 1.79 to 9.84 mg N fixed per 25 mL broth culture, the maximum being with AZO-NMS4 strain which was about 8 times more than the lowest nitrogen-fixing AZO-NMS7 strain. The different strains of Azotobacter significantly increased plant height, fresh and dry weight of root and shoot, uptake of N, P and K by maize shoot, available NPK in soil and population of Azotobacter, actinomycetes and fungi in soil over the uninoculated control at 60 DAS. The numbers of low, medium and high responsive strains in terms of increased shoot dry weight were 2, 11 and 6 strains, respectively. Inoculation with an efficient strain Azotobacter, FYM and graded doses of nitrogen in different combinations significantly increased plant height, fresh and dry weight of root and shoot of maize, uptake of nutrients, microbial population in soil and availability of N, P and K in soil at 70 DAS. Inoculation with Azotobacter alone, FYM alone and AZO+FYM significantly increased dry weight of maize shoot in successive significant manner which was 58.30 %, 138.47 % and 174.61 % more than the control, respectively. The maximum (328.53 % more than control) shoot dry weight was recorded with N-210 treatment which was statistically similar to AZO+FYM+N-80 treatment followed by AZO+FYM+N-60 treatment combination. Further, it has been recorded that AZO+FYM+N-60 treatment combination was statistically at par with application of N @ 120 kg ha-1 in increasing the majority of the parameters studied indicating a saving of 60 kg N ha-1 through the integrated use of biofertilizer, FYM and inorganic nitrogenous fertilizer for obtaining maximum and sustainable crop yield.
  • ThesisItemOpen Access
    Effects of soil and climatic factors and plucking intervals on the growth and yield of tea (Camellia sinensis (L.) O. Kuntze)
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2005-07) Singh, Sunil Kumar; Saini, B.C.
    This investigation was conducted to study the impact of soil and climatic factors on the growth and yield of 8 years old tea bushes grown in the research block of Tea Research Centre, Kausani of G.B. Pant University of Agriculture and Technology, Pantnagar. Tea bushes were pruned in January 2003 and 130 kg nitrogen, 65 kg phosphorus and 130 kg potash /ha were applied in two equal doses in March and July every year. The present experiment was conducted during the years 2004 and 2005 under rainfed conditions. There were three treatments of plucking intervals and nine replications. Each plot consisted of 24 experimental bushes planted in double hedge system (105Х60Х60cm). Available water of experimental soil was 23.3 cm per meter of soil depth However, about 50% of available water is depleted at soil moisture potential higher than - 0.2Mpa. During 2004, total soil moisture in 90 cm soil profile was highest in July (32.7 cm) and lowest in the month of May (7.1 cm) and during March to May percent annual crop was 9.6 only. Total net radiation (Rn) above tea bushes was greatest in the month of May (14.6 MJ m-2 day-1) followed by June, April and March with Rn greater than 12 MJ m-2 day-1. In both years highest green leaf yield was obtained in 9 days plucking interval. In general, nitrogen, phosphorus and potassium uptake was highest in 9 days plucking interval followed by 7 and 5 days plucking intervals. Green leaf yields were 5276, 5002 and 5532 kg/ha in 5, 7 and 9 days plucking intervals in 2004. Similarly, during the summer months of 2005, these values were 2450, 2301 and 3020 kg/ha in the same order. Highest green leaf yield was obtained in June (1354 kg/ha) and in April (1073 kg/ha) in 2004 and 2005, respectively. In the present study, average annual green leaf yield of 5274 kg/ha was obtained which may be further increased by exploiting the solar energy by providing irrigations during summer months and by providing mulch for water conservation. Suitable shade tree has the capacity of lowering the day temperature in summer and increasing the night temperature during winter and may also tried at tea plantations in Uttaranchal.