7Pathak H. , Wassmann R. Quantitative evaluation of climatic varlability and risks for wheat yield in India [J]. Climatic change, 2009, (93): 157-175.
8廖志鸿 郭兴章.油葵适宜播种期探讨.新疆农业科技,1988,(2):31-32.
9Bodega J L,De Dios M A,Iraola MMP. Sowing date affects yield components of canarygrass seed[J]. Canadian journal of plant science,2003,(2):357-362.
10Sastawa B M, Lawan M, Maina Y T. Management of insect pests of soybean: effects of sowing date and intercropping on damage and grain yield in the Nigerian Sudan savanna[J]. Crop Protection,2004,(2): 155-161.