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Nitrogen and Phosphorus Runoff Losses from Orchard Soils in South China as Affected by Fertilization Depths and Rates[J]. ZENG Shu-Cai~1 SU Zhi-Yao~1 CHEN Bei-Guang~1 WU Qi-Tang~(2,*2) OUYANG Ying~3 1 College of Forestry,South China Agricultural University,Guangzhou 510642 (China). 2 College of Natural Resources and Environment,South China Agricultural University,Guangzhou 510642 (China) 3 Department of Water Resources,St.Johns River Water Management District,P.O.Box 1429,Palatka,FL 32178-1429 (