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 |
Field experiments were conducted at three different locations in southern zone of Tamil Nadu to validate the fertiliser prescription developed from Soil test Crop Response correlation under Integrated Plant Nutrition System (STCR-IPNS) for maize on vertisol based on Inductive cum Targeted yield model. The treatments include control, blanket recommendation (100% RDF), blanket recommendation (NPK+FYM @ 12.5t ha-1), soil test crop response (STCR) based fertilizer dose for an yield target of 9.0, 10.0 and 11.0 t ha-1, STCR-IPNS based fertilizer dose for an yield target of 9.0, 10.0 and 11.0 t ha-1and farmer’s practice. The N, P and K fertilizer for different targets was calculated based on the initial soil test values of the respective locations. The cultivation practices were carried out periodically and the grain yield was recorded at harvest. Using the data on grain yield and fertilizer doses applied, parameters viz., per cent achievement, response ratio (RR) and benefit: cost ratio (BCR) were computed. The results revealed that the targeted yield has been achieved within +/-10 per cent variation proving the validity of the equations. The range and mean values of the three validation experiments indicated that the highest mean grain yield of maize was recorded with STCR-IPNS-11t ha-1 (11.08 t ha-1) followed by STCR-IPNS-10 t ha-1 (10.15 t ha-1). Though the highest response ratio of 14.44 kg kg-1 was recorded in STCR-IPNS-9 t ha-1, the highest BCR was recorded in STCR-IPNS-11 t ha-1 (2.26). The mean increase in yield due to STCR-IPNS-11 t ha-1 was 39.7 per cent over blanket (100% RDF), 17.6 per cent over blanket + FYM@ 12.5t ha-1 and 59.6 per cent over farmer’s practice. Farmer’s practice recorded relatively lower yield and response ratio as compared to blanket and STCR treatments while the STCR-IPNS treatments recorded the highest per cent achievement and response ratio over farmer’s practice. Therefore the fertilizer prescription equations developed for hybrid maize on Pilamedu soil series (Typic Haplustert) for achieving 11t ha-1 can be adapted to similar and allied series in other agro-climatic zones of Tamil Nadu.
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