我省棉花品种已更换过多次,每次更换都使产量提高,品质改善。分析建国后我省棉花品种的更换情况,具有以下几个特点。一、国外引种和国内自育品种相结合的更换阶段从50年代到80年代初,我省种植的棉花品种,形成了国外引种和国内自育品种相结合的更换阶段。 Cotton varieties in our province have been changed several times, each time the replacement is to increase production, quality improvement. After the founding of our province cotton varieties change, has the following characteristics. First, the introduction of foreign and domestic self-breeding varieties of the replacement phase From the 1950s to the early 1980s, cotton varieties planted in our province, the formation of a foreign introduction and domestic self-breeding varieties combine the replacement phase.