为了进一步提高杂交稻种纯度,笔者通过反复试验在生产实践中总结了一套以严防机械混杂、严防生物学混杂、严格去除杂株、严格去除变异株为主要技术要点的简易提纯方法——“三系四严速效生产法”,简称“四严法”。一、四严法主要特点 (一) 方法简单四严法主要是将三系分开繁殖,控制住机械混杂机会,这样,杂交稻中多数杂株 In order to further improve the purity of hybrid rice, the author summarizes a set of simple purification methods in the production practice to prevent mechanical hybrids, prevent biological hybrids, strictly remove the hybrid strains, and strictly remove the mutant strains as the main technical points - Three series of four quick-acting production method “, referred to as” four strict laws. " First, the four main features of the strict method of law (a) the method is simple and four strict method is mainly to separate the three lines breeding, control of machinery mixed opportunities, so that most of hybrid rice hybrids