Effect of irrigation regimes and planting geometry on nutrient a vailability, uptake of nutrients and grain yield in rice

摘要

Investigations carried out at Agricultural Research Station. Aliyarnagar, Tamil Nadu, India during 1993-94 and 1994-95 revealed that irrigation scheduled one day after disapperance of ponded water, closer plating of 50 hills m~(-2) and planting of four seeldings hill~(-1) recorded higher uptake of N. P and K. Planting method, either rectangular or equidistance did not influence the uptake of nutrients. The varieties CO 45 and ADT 38 absorbed more N.P and K than IR 20. Soil available nutrients of N and K were not influenced by irrigation regimes. However, soil available P was higher at tile irrigation regime of three days ,after disappearance of ponded water. Soil available Phosphorus and Potassium were higher under wider planting of 33 hill m~(-2). Available P was higher when planted with two or six seedling hill~(-1). Soil available N,P and K were higher when IR 20 was raised than CO 45 and ADT 38. Irrigation one day after disappearance of ponded water recorded higher gain yield compared to irrigation three days after disappearance of ponded water. Planting geometry did not influence the rice yield. Planting 4 seedling hill~(-1) recorded higher grain yield compared to planting 2 or 6 seedlings hill~(-1). CO 45 and ADT 38 recorded higher grain yield compared to IR 20.