一个农作物新品种审定通过并确定其推广范围后,就要建立相应的制度,采取相应的措施,保持其原有典型性状,以延长其利用年限,充分发挥其增产效能和经济效益,这就是良种繁育.广义的良种繁育包括良种选定、原种繁殖和供种体制三方面,狭义的良种繁育是指优良品种的原种生产和大田用种的生产.这里谈的是后一种良种繁育. After the approval of a new crop of crops and the determination of its scope of promotion, it is necessary to establish a corresponding system and take appropriate measures to maintain its original typical traits in order to extend its useful life and give full play to its yield-increasing efficiency and economic benefits, which is good seed Breeding of broad-spectrum breeding includes the selection of elite species breeding and breeding system for the three aspects of the narrow sense of breeding is the elite species of fine varieties of production and field production. Here is the talk about the later breeding.