Asian Journal of Agricultural Research 1819-1894 xxxx-xxxx Knowledgia Review 10.3923/ajar.2007.105.111 Curcuma longa L.)]]> Jagadeeswaran R. Murugappan V. Govindaswamy M. Kumar P.S. Senthil 3 2007 1 3 The present investigation was carried out to study the influence of multi-nutrients (NPK) slow release fertilizers on the soil fertility status of turmeric at different growth status. Slow release NPK fertilizers are newly formulated and in the form of tablets, mixtures and coated which contains all the three major nutrients in them. These five slow release NPK fertilizer sources were tested in comparison with straight fertilizers at three NPK levels (75, 100 and 125% of recommended dose) in a randomized block design. The results of the present study clearly establish that the wet rhizome yield increased significantly up to 125% of NPK level applied and when applied in the form of tablets. Soil available major nutrients tested at 90 Days After Sowing (DAS), 180 DAS and at harvest stage of crop significantly increased with increasing levels of NPK and when applied in the form of tablets. The nutrient availability in soil, which is estimated as various availability indices are useful in comparing the efficacy of different fertilizer sources in maintaining an available pool of nutrients in soil during various stages of crop growth.

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