Two field experiments were conducted at Wetland Farm. Agricultural College and Research Institute. Killikulam. Tamil Nadu, during Kharif and rali seasons of 1993-94 with different organic sources (farmyard manure, composted coirpith. raw coirpith, composted sugarcane trash, raw sugarcane trash, pressmud and green leaf manure Sesham aculeata with graded levels of nitrogen viz., 0. 50. 75 and 100 kg N ha. The other major nutrients P and K were applied at the rate of 50 kg ha in the form of single super phosphate and muriate of potash, respectively, to study the direct and residual effect of various organic wastes on the soil available K. uptake of K and yield of low land rice. Application of composted coirpith improved the soil available k status and increased the uptake of potassium by grain and straw. The results indicated that 50 kg N with green leaf anure recorded the highest grain and straw yield in both seasons.
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