Effect of Phosphorus on Nutrient Uptake of Japonica and Indica Rice

Abstract

An experiment was conducted at the screen house of Tsukuba International Centre (TBIC), Japan to clarify the effect of phosphorus on nutrient absorption characteristics of a japonica (Nipponbare) and an indica (IR-28) rice variety. The experiment was conducted under submerged condition in subsoil of an Andisol, which had a high capacity of phosphate fixation. Levels of phosphorus were 100, 200, 500 and 800 kg P2O5 ha-1. The P content in rice plant at different growth stages increased progressively with an increase of P levels for both the varieties. With respect to P content, varietal differences were minimal. But in the case of N and K content, IR-28 showed higher ability than Nipponbare. At maximum tillering stage, both the varieties showed negative co-relation between P and N uptake but at harvest stage, strong positive co-relation between P and N uptake was found for both the varieties. Both the varieties showed positive co-relation between N and K uptake at all the stages. Key words: Andisol, IR-28, nipponbare, phosphorus, uptake. doi:10.3329/jard.v6i1.1651 J Agric Rural Dev 6(1&2), 7-12, June 2008