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Analysis of the nitrogen uptake and utilization efficiency and N fertilizer residual effect in the wheat-maize-soybean and wheat-maize-sweet potato relay strip intercropping
YONG Tai-wen, XIANG Da-bing, ZHANG Jing, WAN Yan, LIU Wei-guo, YANG Wen-yu
Acta Prataculturae Sinica . 2011, (6): 34 -44 . 

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