Studies on the substitution of inorganic fertilizers with organic manure and their effect on soil fertility in rice—wheat rotation |
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Authors: | HS Gill OP Meelu |
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Affiliation: | (1) Department of Soils, Punjab Agricultural University, 141004 Ludhiana, India |
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Abstract: | Field studies on the substitution of N and P fertilizers with farm yard manure (FYM) and their effect on the fertility status of a loamy sand soil in rice—wheat rotation are reported. The treatments consisted of application of 12 t FYM ha–1 in combination with graded levels of N and P. Application of fertilizer N, FYM and their different combinations increased the rice yield significantly. There was no significant response to P application. The magnitude of response to the application of 12 t FYM and its combined use with each of 40 kg and 80 kg N ha–1 was 0.7, 2.2 and 3.9 t ha–1 respectively. Application of 120 kg N ha–1 alone increased the yield by 3.9 t ha–1, and was comparable to rice yield obtained with 80 kg N and 12 t FYM ha–1. This indicated that 12 t FYM ha–1 could be substituted for 40 kg N as inorganic fertilizer in rice. In addition FYM gave residual effects equivalent to 30 kg N and 13.1 kg P ha–1 in the succeeding wheat. The effect of single or combined use of inorganic fertilizers and FYM was significantly reflected in the build up of available N, P, K and organic carbon contents of the soil. The relationship for predicting rice yield and nutrients uptake were also computed and are discussed. |
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Keywords: | direct effect organic manure residual effect rice— wheat rotation soil fertility substitution |
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