[EJ-12-20]Impacts of Training on Farmers’ Nitrogen Use in Maize Production in Shandong, China

作者：　　期刊： 　　来源：

作者：Huang, Jikun, Cheng Xiang, Xiangping Jia and Ruifa Hu　　期刊：Journal of Soil and Water Conservation, Vol. 67, No 4 (2012): 321-327.　　来源： ccap