棉花自交混繁法的应用山东省夏津县棉花原种场孔庆森我场自１９６３年建立以来，直到１９８８年一直采用“三圃制”法生产棉花原种。从１９８９年起改用“自交混繁”法生产。通过５年的实践，证明后者较前者有以下优点：第一，原种生产速度快。第一年种植同样数量、面积的... Application of Mixed Self-bred cotton method Xiaoxian County, Shandong Province cotton original seed field Kong Qingsen I field since its establishment in 1963, until 1988 has been using “three-pu system” method of producing cotton seed. From 1989 onwards to switch to “self-mixing” complex production. After five years of practice, the latter proves that the latter has the following advantages: First, the production of the original species is fast. The same year the same amount of planting area ...