嘉星5号是2008年经国家农作物品种审定委员会审定通过的中早熟棉花杂交种。近几年在河北、山东具有一定的种植面积。但不足是:下部烂铃多,霜降后上部未完全吐絮,健籽率、发芽率偏低,检测个别批次纯度不达标。根据多年对杂交种制种过程的调研,要想提高制种质量和产量,应注意以下几点。1亲本选择严格按三圃制繁殖亲本,亲本纯度不低于96%,净 Jiaxing 5 is the 2008 pre-approved by the National Crop Variety Commission approved by the premature hybrid cotton varieties. In recent years in Hebei, Shandong has a certain area planted. But the shortcoming is that the lower part of the rotten bell is more, the upper part of the cockroach is not completely discharged after the frost is reduced, the rate of the healthy seed is low and the germination rate is low, and the purity of the individual batch is not up to standard. According to many years of hybrid seed production process of research, in order to improve seed quality and yield, should pay attention to the following points. 1 Parents choose strictly according to three nursery breeding parents, the parent purity of not less than 96%, net