STCR approach for optimizing integrated plant nutrients supply to obtain better growth and yield of hybrid maize (Zea mays L.)
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Date
2019-06
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
A field experiment was conducted during the year 2017-18 in an Aquic Hapludoll at D7 block of Norman E. Borlaug Crop Research Centre of G.B. Pant University of Agriculture and Technology, Pantnagar under AICRP on soil test crop response (STCR) correlation to develop fertilizer adjustment equation for computing nutrient doses for target yield of hybrid maize on the basis of initial soil fertility. Response of hybrid maize to selected combination of three levels of FYM (0, 5 and 10 t ha-1), 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, 20, 40 and 60 kg K2O
ha-1) of hybrid maize at different fertility levels was studied. Chemical analysis was performed to estimate organic carbon, available nitrogen, phosphorus and potassium status in the soil. Nutrient requirement to produce one quintal of hybrid maize grain was found to be 2.17 kg, 0.46 kg, and 2.74 kg of N, P and K, respectively. Per cent contribution of N, P and K was 33.14, 26.80 and 22.71 from soil and 45.21, 14.44 and 39.40 from FYM, 58.18, 62.68 and 420.4 from chemical fertilizer and 62.36, 63.52 and 427.61 from combined use of chemical fertilizer with FYM. Fertilizer adjustment equations were developed with and without FYM with the help of basic data. Coefficient of determination (R2) was found highly significant (0.7312**) between grain yield, soil test values, added fertilizers and interaction between soil and fertilizer. Suitability of soil test methods was also evaluated by R2 value of multiple regression equation and concluded that Olsen’s and Normal neutral NH4OAC methods are suitable for the determination of phosphorus and potassium, respectively, for Hybrid maize crop grown on Mollisol of Uttarakhand. Findings could be used as guide for efficient fertilizer management for hybrid maize grown in Mollisol of Uttarakhand, which provides not only balanced nutrition to crop but also may fetch good profitability.