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Validating the optimal phosphorous and potassium application rates for rice based on soil testing and fertilizer recommendation by ASI
wei yi-chang1; 2; bai you-lu2; yang li-ping2; yao zheng3; luo guo-an3; xu si-xin3; song wei4; zhu chun-mei4(1.college of resources and environment; north china university of water conservancy and electric power; zhengzhou 450011; 2.institute of agricultural resources and regional planning; chinese academy of agricultural sciences; beijing 100081; 3.institute of environmental science; shanghai academy of agricultural sciences; shanghai 201106; 4.agricultural experiment station; shanghai haifeng rice industrial co.ltd.; dafeng jiangsu 224153)
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