Abstract:As the continuous input of P fertilizer, phosphorus is gradually accumulated in the soils. The lost P from the soils through runoff and leaching becomes more and more the important source of P in water. In this study, 23 soils were collected from the croplands over the 13 China provinces or cities such as Lingchuan Guangxi, Jianshui Yunnan, Liuzhi Guizhou, Zhangpu Fujian, Xiangshan Zhejiang, Rugao Jiangsu, Taian Shandong, Nanyang He‘nan, Ya‘nan Shaanxi, Haikou Hainan, Qianjiang Hubei, Changsha Hunan and Hai...