Optimization of integrated nutrient recommendations through soil test crop response approach for forage oats (Avena sativa L.) grown in a mollisol
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Date
2019-07
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
Field experiment was conducted at Crop Research Centre during 2018-19 of G.B. Pant University of Agriculture and Technology Pantnagar, U.S. Nagar (Uttarakhand) to optimize Integrated Nutrient Recommendations through Soil Test Crop Response approach for forage oats grown in Mollisols. The experiment was conducted as per the technical programme and methodology of AICRP on Soil Test Crop Response. In first phase soil fertility gradient was created by dividing experimental field into three equal strips and applying graded doses of fertilizers in these strips and growing of exhaust crop of wheat. In the second phase, first crop of crop rotation i.e. maize was grown. In the third phase, second crop of crop rotation which was test crop i.e. Forage oats (var. Pant Forage Oat-3) was grown by dividing each strip into 24 plots having 21 treated and 3 control. Response of forage oats to selected combinations of three levels of FYM (0, 5 and 10 t ha-1), four levels of nitrogen (0, 40, 80 and 120 kg N ha-1), four levels of phosphorus (0, 30, 60 and 90 kg P2O5 ha-1) and four levels of potassium (0, 20, 40 and 60 kg K2O ha-1) at different soil fertility levels was studied. The value of organic carbon, Alkaline-KMnO4 extractable nitrogen, Olsen’s phosphorus and neutral normal NH4OAc extractable potassium in the experimental field ranged between 0.47 to 1.01 per cent, 75.26 to 150.53 kg N ha-1, 10.77 to 31.68 kg P ha-1 and 117.60 to 176.96 kg K ha-1 respectively. The average value of forage yield was 525.99 q ha-1. Total average uptake of N, P and K was 146.31, 17.45 and 169.56 kg ha-1, respectively. Nutrient requirement to produce one quintal forage yield, forage oats required 0.27 kg of
nitrogen, 0.03 kg of phosphorus (P) and 0.32 kg of potassium (K). Per cent contribution of N, P and K was 71.37, 33.72 and 59.93 from soil and 73, 7.51 and 90.37 from FYM, 89.57, 50.84 and 302.72 from chemical fertilizer and 102.43, 52.93 and 351.54 from conjoint use of chemical fertilizer with FYM. With the help of basic data, fertilizer adjustment equations were developed for conjoint use of fertilizers and FYM.
Coefficient of determination (R2) was found highly significant (0.7954*) between forage yield, soil test values, applied fertilizer doses, their interaction and also FYM. Maximum response of forage oats to fertilizers was obtained at 80 kg N, 30 kg P2O5 and 20 kg K2O ha-1. Forage yield was also significantly correlated with growth parameter of forage oats. Findings could be used as guide for efficient fertilizer management of forage oats grown in Mollisols of Uttarakhand, which provides not only balanced nutrition to crop but may also fetch good profitability.