Saturday, 15 July 2006

Soil Test Based Fertilizer Recommendation for Carrot on Ultic Hapludalf of Tamil Nadu,India.

Palanimuthu Murugesaboopathi, Ramar Uma Devi, Ramasamy Natesan, and Subramanium Thiyageshwari. Tamilnadu Agricultural Univ, Dept of Soil Science and Agricultural Chemistry, Lawley Road, Coimbatore, 641 003, India

Food security, nutritional security, sustainability and profitability are the main focus of the present and future agricultural development. With the possibility of horizontal expansion or putting more land under cultivation being remote, future augmentation in yield would have to be harnessed vertically through judicious management of all the input resources. Balanced nutrition to crops, play a major role in increasing efficiency and economy of fertilizer use and this can be achieved through Soil Test based Crop Response (STCR) under Integrated Plant Nutrient Supply System (IPNS). Indiscriminate application of fertilizers will cause either nutrient deficiency or toxicity in both soils and crops. The Nilgiris district is one of the largest vegetable producer of Tamil Nadu and 67 per cent of carrot (Daucus carota) is produced from this area. The farmers of this region follow blanket recommendation without considering the fertility status of the native soil. With a view to provide balanced and judicious fertilizer recommendation, soil test correlation studies were conducted with carrot as test crop in Ultic Hapludalf of Nilgiris district, Tamil Nadu. The fertilizer prescription equations under IPNS were developed from a complex experiment and the ready reckoner for fertilizer doses was worked out for varying soil test values to obtain a target yield of 40 t ha-1 of root carrot . Test verification trials were conducted in the farmers' holdings of the same district. The treatments imposed were: control, application of vermicompost alone, STCR inorganics and with IPNS for 40,50 and 60 t ha-1 target yields. In all the locations, more than 90 per cent of the target yields were achieved thereby validating the equations developed. The percentage achievement of 113 and Response Ratio of 127 kg/kg was obtained with 40 t ha-1 of target yield under STCR- IPNS over 50 and 60 t ha-1 besides maintenance of soil fertility.

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