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Study on Balance Fertilization for Lettuce under Greenhouse
——A Sample Studied in Songgezhuang Village of Beijing
Wei Li, Zhang Huaiwen, Zhao Guolong, Zou Guoyuan , Zhang Jing, Jin Man ,Zuo Qiang, Wang Jiachen
Chinese Agricultural Science Bulletin . 2008, (7): 299 -302 .  DOI: 10.11924/j.issn.1000-6850.20085956