棉花留种应该注意什么?据实践证明,在选留种时,一定要注意以下“五要”和“八不要”:“五要”即要选择品种纯度高的地块、要选择无病虫害的棉株、要抛开田边地头而在地中央选种、要 Cotton species should pay attention to what? According to the practice proved that the choice of species, we must pay attention to the following “five to” and “eight do not”: “five to ” that is, to choose varieties of high purity , To choose no plant diseases and insect pests, to open aside the land side of the land in the central selection, to