The Uptake of Phosphorous and Potassium of Rice as Affected by Different Water and Organic Manure Management

The effects of two water regimes viz. continuous ponding (CP) and intermittent ponding (IP) along with three organic amendments such as cow manure (CM), poultry manure (PM) and rice husk (RH) on growth and yield of rice (Oryza sativa L.) was studied in this work. Rice was grown in pots having sandy loam soils in the Department of Soil Science, University of Chittagong, Bangladesh. Organic amendments generally improved yield and concentration as well as accumulation of phosphorus and potassium under both CP and IP conditions. The dry weight of grain and straw did not differ significantly among the organic amendments. The concentration and accumulation of phosphorus in different parts of rice plants was found higher in CP condition in comparison to IP under all organic amendments. However, the uptake of potassium was higher under IP condition in general, and the maximum concentration and accumulation was found when poultry manure was incorporated with soil under IP condition. Total accumulation of phosphorus followed the order of grain>shoot>root, and the sequence of potassium accumulation was found as shoot>grain>root. The results of the present experiment indicated that intermittent irrigation with organic amendments especially poultry manure could be one of the best approaches for maintaining better yield of rice and uptake of potassium with application of minimum irrigation water