Author(s):

DK Mahto, SK Chaudhary, SK Yadav, Vikash Kumar, RP Sharma

Abstract: An on farm research entitled “On Farm Crop Response to Plant Nutrients in Rice Maize Cropping System” was conducted during 2014-15 at farmers’ field of Purnea in Zone II of Bihar. The seven treatments, <em>viz.,</em> T₁-Control, T_2-Recommended N alone, T_3-Recommended N and P, T_4-Recommended N and K, T₅-Recommended N, P and K, T_6-Recommended NPK with ZnSO₄and T_7-Farmers’ practice were taken for study. ZnSO₄ was not applied in maize crop owing to observe its residual impact, applied in rice. Application of 100 kg ha^-1 N, 40 kg ha^-1 P₂O₅ and 20 kg ha^-1 K₂O along with 25 kg ha^-1 ZnSO₄ in rice recorded significantly higher grain (47.5q ha^-1) yield, and in the same plot in succeeding maize, application of 120 kg ha^-1 N, 75 kg ha^-1 P₂O₅ and 20 kg ha^-1 K₂O recorded significantly higher grain (86.11 q ha^-1) yield. Similarly, the maximum system rice equivalent yield (173.22 q ha^-1) and productivity (47.46 kg ha^-1 day^-1) were also achieved under (T₆) nutrient combination. Highest N, P and K uptake was observed in T₆87.75, 32.05 and 110.0 kg ha^-1 respectively, in both the crop in both season. Significantly highest gross return (1, 87,458 ha^-1), net return (1, 25,788 ha^-1) and B: C ratio (2.49) was also found in NPK+Zn.

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