Author(s):

Krishna, LK Srivatsava, GK Jatav and Rakesh Banwasi

Abstract: A field experiment was conducted in SRI Rice crop with integrated use of FYM and fertilizer for Validation and refinement of soil test based derived fertilizer equation at the Instructional farm of Indira Gandhi Agricultural University, Raipur (C.G). Based on the experiment the 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. 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. 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.

Pages: 1902-1905  |  623 Views  224 Downloads

Download (563KB)