National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
The fertilizer adjustment equations evolved during previous season for the Swarna variety of rice was tested and fertilizer application with organic source (FYM). It was also noticed that fertilizer dose applied based on STCR prescription derived previously to achieve a definite yield target could not be obtained. This may be due to differences in various input use efficiency, nutritional requirement. However, further refinement of the equations was tried using nutrients omission plot technique and basic parameters required for the formulation of the fertilizer equations were confirmed. The amount of nutrient required to produce one quintal of rice grain yield was found to be 1.57 kg N, 0.30 kg P and 1.71 kg K. The contribution of fertilizer N, P and K were estimated as 41.83, 28.37 and 116.21 per cent. Similarly, the contribution of soil test N, P and K were recorded as 33.55, 81.28 and 19.10 percent. The contribution of organic source (FYM) was observed as 13.8 % N, 6.67 % P and 11.64 % K. After refinement of the fertilizer prescription equations, it was observed that by calculation with new equation, N and P fertilizer requirement at various soil test levels increased over existing equations developed previously. However, the dose of K fertilizer was lower than existing one. Hence, a new set of N P K doses at different soil test levels were evolved and need to be tested for its suitability under similar soil and crop situation.
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