Continuous application of large amount of P fertilizer in Taihu Region in recent years has rapidly increased plant available phosphorus in the topsoil. Accumulation of P in an appropriate amount can lead to beneficial effects, while in an excessive amount could cause water pollution. Aimed at the realistic problem on environment protection, this study was carried out field plot experiments in a leaky paddy soil (in Zhangjiagang, Jiangsu province) with different levels of P application rates (0, 30, 70, 150,...