Evaluation of Soil Test and Yield Target Based Fertilizer Prescription Model for Radish on an Alfisol

摘要

Field experiments were conducted in Southern and Western Zones of Tamil Nadu to evaluate the Soil Test Crop Response based fertilizer prescription model under Integrated Plant Nutrition System (STCR-IPNS) for desired yield targets of radish on red calcareous soils (Palathurai series-Typic Rhodustalf). The treatments include control, blanket recommendation, soil test crop response (STCR) based fertilizer dose for an yield target of 401 ha~(-1) and 501 ha~(-1), STCR-IPNS based fertilizer dose for an yield target of 401 ha~(-1) and 501 ha~(-1) and farmer's practice. The results of the experiments indicated that, in all the six trials, the per cent achievement of the targeted yield was within +- 10 per cent variation proving the validity of the equations for prescribing integrated fertilizer doses for radish. The highest mean per cent achievement was recorded with STCR - IPNS - 501 ha~(-1) (101.3) followed by STCR-NPK alone 501 ha~(-1) The highest mean yield was recorded in STCR-IPNS - 50 t ha~(-1) (50.6 t ha~(-1)) recording an increase of 56.7 per cent over blanket recommendation and 69.0 per cent over farmer's practice. Among the treatments, STCR-IPNS-50 t ha~(-1) recorded relatively higher RR (81.3 kg kg~(-1)) and BCR (2.24) than other treatments.Post-harvest soil available NPK indicated the build up and maintenance of soil fertility due to soil test based fertilizer recommendation under IPNS.