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Effects of Various Nitrogen Levels on Petiole Spot in Chinese Cabbage
Liu Dong1, Yang Xiaoyun2, Wang Yuan2, Si Chaoguang2, Zhang Shuxia2, Zhang Qingxi
Chinese Agricultural Science Bulletin . 2010, (11): 303 -307 .  DOI: 10.11924/j.issn.1000-6850.2010-0012