Journal of Northern Agriculture ›› 2017, Vol. 45 ›› Issue (2): 17-17.
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CHEN Qianwu1, YANG Wenyao1 ,LIU Jinchuan1, WANG Mangui2 (1.Inner Mongolia Academy of Agricultural and Animal Husbandry Sciences,Hohhot 010031,China; 2.Hetao College Secondary Vocational and Technical School,Linhe 015000,China)