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棉花常规杂交方法是头一天下午去雄,次日上午进行人工授粉,这样给杂交工作带来许多麻烦。尤其在教学单位对教学实习课
The conventional method of cotton hybridization is to extinct on the first afternoon and artificial pollination the next morning, which brings a lot of trouble to the hybridization work. Especially in teaching units of teaching practice classes