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Subject: Soil Sciences × Author: Bhatt, Pallavi × End date: 2020 × Start date: 2020 ×
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    ThesisItemOpen Access
    Soil test crop response studies for efficient nutrient management on brinjal (Solanum melongena L.) grown in a mollisol of Uttarakhand
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2020-09) Bhatt, Pallavi; Singh, Sobaran
    Field experiments were conducted during the year 2017-18 and 2018-19 in a Aquic Hapludoll at D7 block of Norman E. Borlaug Crop Research Centre of G.B. Pant University of Agriculture and Technology, Pantnagar (290 N latitude and 79029’ E longitude), as per the technical programme of the All India Coordinated Research Project on Soil Test Crop Response Correlation. The experiments were conducted in three phases. In the first phase soil fertility gradient was created by dividing experimental field into three strips and applying graded doses of fertilizers (Strip I (no fertilizer), Strip II (100,100 and 100 kg N, P2O5 and K2O/ha) and Strip III (200, 200 and 200 kg N, P2O5 and K2O ha-1) and growing of exhaust crop fodder Oats (Pant 612). In the second phase i.e. next season test crop Brinjal (Solanum melongena L.) was grown in spring and kharif season by dividing each strip in 24 plots having 21 treatments and 3 controlled plots. Response of brinjal var Pant samrat was studied to selected combinations of three levels of FYM (0, 10 and 20 t/ha), four levels of nitrogen (0, 60, 120 and 180 kg ha-1), four levels of phosphorus (0, 30, 60 and 90 kg P2O5 ha-1) and four levels of potassium (0, 30, 60 and 90 kg K2O ha-1) at different fertility levels. In third phase, a verification trial was conducted during 2019 to validate the fertilizer adjustment equations generated by ten treatments and three replications, with combinations of inorganic, organic and growth regulator. The values of the organic carbon, Alkaline KMnO4 extractable N, Olsen’s P and neutral normal Ammonium Acetate extractable K in the experimental field ranged between 0.34 to 1.57 per cent, 100.35 to 200.70 kg ha-1 and 15.06 to 19.85 kg ha-1, 110.88 to 208.32 kg ha-1, respectively. The fruit yield of brinjal ranged from 70.83 to 300.82 q ha-1for spring brinjal and 110.25 to 302.01 q ha-1, for kharif brinjal. The total uptake of N, P and K ranged from 17.57 to 127.26, 2.02 to 37.77 and 9.55 to 63.00 kg ha-1, respectively by spring brinjal. However, for kharif brinjal the total uptake of N, P and K ranged from 15.06 to 159.76, 6.66 to 55.91 and 16.25 to 89.69 kg ha-1, respectively. Suitability of soil test methods was also evaluated by R2 value of multiple regression equation and concluded that Alkaline KMnO4-N, Olsen’s-P and NH4OAc-K methods are suitable for the determination of available nitrogen, phosphorus and potassium, respectively in Tarai region of Uttarakhand for brinjal crop. However, other methods were also found at par and may be recommended for use in soil testing laboratories. Basic data were generated with the help of soil test values, fertilizer doses, yield and nutrient values separately for both the seasons and then taking average for pooled basic data. The nutrient requirement for production of one quintal of brinjal was found to be 0.50 kg Nitrogen, 0.14 kg Phosphorus and 0.25 kg Potassium. Percent contribution of nitrogen, phosphorus and potassium was 31.63, 29.61 and 13.82, respectively from soil, whereas it was 59.58, 94.60 and 81.10 percent respectively from FYM. Percent contribution of nitrogen, phosphorus and potassium without FYM was 39.86, 35.52 and 44.98 and with conjoint use of chemical fertilizer with FYM 50.41, 47.43 and 65.12 percent, respectively. Fertilizer adjustment equations developed for conjoint use of fertilizers with the help of pooled basic data are: FN= 1.00T- 0.63 SN-0.59 ON, F P2O5= 0.68T- 1.43SP- 3.17OP, F K2O = 0.47T- 0.26SK- 0.75OK. Maximum response to spring brinjal was obtained at 120 kg N, 60 kg P2O5 and 60 kg K2O ha-1. While for kharif brinjal, maximum response was obtained at 180 kg N, 30 kg P2O5 and 90 kg K2O ha-1. The fruit yield of spring brinjal was significantly correlated with total uptake of nitrogen (0.636**), total uptake of phosphorus (0.696**) and total uptake of potassium (0.720**). However, for kharif brinjal fruit yield of brinjal significantly correlated total uptake of nitrogen (0.598**), total uptake of phosphorus (0.674**) and total uptake of potassium (0.659**). For the post harvest soil test values prediction equations were developed for available Nitrogen, Phosphorus and potassium. Verification trial was conducted to test the validity of fertilizer adjustment equations. Fertilizer application based on targeted yield approach was found to be significantly superior over general recommended dose (GRD). Findings from present investigation can be successfully utilized for Tarai region of Uttarakhand aseffective guide for efficient and balanced fertilizer recommendation for brinjal.