Srivastava, AjayaChoudhury, Priyanka2021-11-202021-11-202021-10https://krishikosh.egranth.ac.in/handle/1/5810178185A field experiment was conducted during 2019-2020 at the D7 Block of Norman E. Borlaug Crop Research Centre of G. B. Pant University of Agriculture and Technology, Pantnagar. The aim of this conducted experiment under AICRP-STCR was to develop fertilizer adjustment equation for computing required nutrient doses to achieve targeted yield of Urd. Response of urd to the selected combination of three levels of FYM (0, 5 and 10t ha-1), four levels of each of Nitrogen (0, 10, 20 and 30kg ha-1), Phosphorus (0, 25, 50 and 75kg ha-1) and Potassium (0, 15, 30 and 45kg ha-1) were studied. Organic carbon, available nitrogen, phosphorus and potassium status of the experimental plot was studied. It was found that to produce one quintal of urd grain 3.24 kg of nitrogen, 0.79 kg of phosphorus and 2.73 kg of potassium were needed. Percent contribution of N, P and K was 26.77, 17.44 and 21.27 from soil, 66.94, 41.21 and 51.64 from chemical fertilizer solely, 10.25, 7.23 and 5.86 from FYM and 92.37, 65.72 and 52.77 from combined use of fertilizer along with FYM. Using the basic parameters like NR, Cs, Cf, Cfym per cent, fertilizer adjustment equations were developed. Using the soil test value, fertilizer nutrient value, interaction between soil and fertilizer as independent variable and yield as dependent one, multiple regression equation was developed and coefficient of determination (R2) was calculated. The R2 value (0.8517**) found highly significant. Post harvest soil test values of nitrogen, phosphorus and potassium were predicted based on the values of soil testing, fertilizer nutrients, yield and nutrient uptake. Based on the findings of above mentioned experiment, efficient fertilizer management can be done for urd to obtain targeted yield under a range of soil test value in Mollisol of Uttarakhand. Resource poor farmers could also fetch good profitability by applying fertilizers based on this site specific target yield concept.EnglishThesis