Responses of Seed Yield and Quality to Nitrogen Application Levels in Two Oilseed Rape (Brassica napus L.) Varieties Differing in Nitrogen Efficiency by Zhen-hua Zhang, Hai-xing Song, Qiang Liu, Xiang-min Rong, Jian-wei Peng, Gui-xian Xie, Yu-ping Zhang, Li-ru Chen, Chun-yun Guan, Ji-dong Gu

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