一、优质高倍繁殖技术的提出传统的棉种繁殖,大都采取条播、稀植、重肥、大棵的方式。这种方式居多纯作,复种指数低、密度低、用种多、施肥多、花工多、成本大;要提高霜前花率和繁殖系数,比较费力。80年代生产管理制度变革,良繁田亩分户承包。广大专业户十分讲究繁种的综合效益:既要繁殖系数高,种子质量好,又要成本低, First, the high-quality breeding techniques Proposed traditional cotton seed multiplication, mostly to broadcast, thin planting, heavy fat, big way. This method mostly pure, low multivistimulation index, low density, use more, fertilize more, spend more, costly; to increase frost before flowering and breeding coefficient, more laborious. Production management system changes in the 1980s, Liang Mu Tian Mu household contract. The majority of professional households are very particular about the comprehensive benefits of breeding: it is necessary to high reproductive coefficient, good seed quality, but also low cost,