Computation of fertiliser requirement based on INM and yield target for potato (Solanum tuberosum L.) and It’s residual effect on green gram (Vigna radiata L.)
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Date
2008-06
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
A field experiment was conducted at Crop Research Centre, Pantnagar under AICRP on Soil Test Crop Response Correlation to develop fertilizer adjustment equations for computing nutrient dose for target yield of potato (Solanum tuberosum L.) on the basis of initial soil fertility and nutrient dose. The test crop potato was sown using 3 levels of N, P, and K with controls in 3 different fertility gradient strips. 24 treatments were randomly distributed in each strip and 3 blocks were made differing in organic manure level (0 t ha-1, 10 t ha-1, 20 t ha-1). Chemical analysis was carried out to estimate organic carbon, available nitrogen, phosphorus and potassium in soil. Multiple regression equation, maximum yield and economic yield were enumerated. The nutrient requirement for producing one quintal of potato tuber was found to be 0.33 kg of nitrogen, 0.05 kg of phosphorus and 0.40 kg of potassium. The per cent contribution from soil was 20.01, 8.02 and 19.84 per cent; from applied FYM 12.82, 1.32 and 14.49; from fertilizer 15.41, 5.43 and 26.21 for nitrogen, phosphorus and potassium, respectively. Co-efficient of determination (R2) was found significant (0.614**) between yield and soil test values. In residual study with green gram (Vigna radiata L.), residual fertility of N3P3K3 treatment shows highest yield followed by N1P3K2 and N2P1K1. Grain yield was significantly and negatively correlated (-0.392**) with shoot yield of green gram. Verification trial of potato was also carried out. These findings can successfully be used in the larger parts of Tarai region of Uttarakhand as effective guide for efficient fertilizer management by reducing cost of cultivation, increasing fertilizer use efficiency and keeping environment pollution free. Therefore, soil test based fertilizer recommendation may be a useful tool for balanced fertilization of nutrients.