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The changes of morphine content in opium poppy under different irrigation
Wang Junqiang, He Qingxiang, Lei Yaohu, Li Yanrong, Xie Zhongqing, Yang Zhenhua,
Chinese Agricultural Science Bulletin . 2010, (9): 156 -161 .  DOI: 10.11924/j.issn.1000-6850.2009-2639