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 |
Soil Test Crop Response correlation studies under Integrated Plant Nutrition System (STCR-IPNS) were conducted for maize on Vertisol based on Inductive cum Targeted yield model at Southern Zone of Tamil Nadu during 2016-17. After the establishment of three different soil fertility gradients in the same experimental field, 24 treatments comprising different combinations of N, P2O5, K2O and FYM (four levels each of fertiliser N, P2O5 and K2O and three levels of FYM) were superimposed over the three fertility strips in a Fractional Factorial Design with the test crop maize (TNAU maize hybrid CO 6). The results of the present investigation clearly revealed that there was a progressive increase in response with increase in fertilizer N (300 kg ha-1), P2O5 (120 kg ha-1) and K2O (120 kg ha-1) levels. Therefore, using the experimental data, the basic parameters viz., (i) the requirement of N, P2O5 and K2O for maize was found to be 2.08, 0.73 and 1.38 kg q-1, respectively (ii) the per cent contribution of nutrients from soil (Cs) was 43.01, 44.03 and 9.17; from fertilizers (Cf) was 55.00, 49.83 and 76.99 and from farm yard manure (Co) was 49.01, 19.71 and 39.83 for N, P2O5 and K2O, respectively. Making use of the basic parameters, fertiliser prescription equations (FPEs) have been developed and ready reckoner of fertiliser doses was formulated for desired yield targets of maize for a range of soil test values on Vertisol. The findings brought forth the fact that when farm yard manure (FYM) was applied @12.5 t ha-1 (with 25% moisture and 0.54, 0.26 and 0.53% NPK, respectively), 45, 22 and 32kgha-1 of fertilizer N, P2O5 and K2O could be reduced from the recommended fertiliser doses for maize.
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