4Bodega J I4, De Dios M A,Iraola MMP. Sowing date affects yield components of canarygrass seed[J]. Canadian journal of plant science,2003 ,(2):357-362.
5Sastawa 13 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.
7Bodega 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.
8Sastawa 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.