Journal of Northern Agriculture ›› 2015, Vol. 43 ›› Issue (6): 151-151.
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WANG Yanling,ZHANG Jiayun,LI Zhixin,QIU Hongmei (1.Baotou Soil and Fertilizer Work Station, Baotou 014010,China;2. Baotou Agricultural Technology Extending Station, Baotou 014030,China;3. Guyang Agriculture and Animal Husbandry Management Station, Guyang 014200, China)