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一我国棉种退化情况棉种退化,在我国极为普遍。退化应怎样下定义呢?可能每个人有不同的解释。主要应该表现在纤维变短,杂子率增高两方面。在田间相应地表现为铃变小,子变小,和植株生长和性状变得参差不齐等。据山东农业科学研究所的研究,1948年引种到惠民、临清两棉区的斯二比,和1950、1951年引种到胶东、德州两棉区的斯五爱,在1953年冬,从各地所征集的棉样中,已发生程度不同的退化现象。斯二
A cotton degeneration of cotton species degeneration, very common in our country. How to define degeneration? Maybe everyone has a different explanation. The main should be manifested in shorter fibers, increased hybrid rate two aspects. Correspondingly, in the field, the bolls became smaller and smaller, and plant growth and traits became uneven. According to the research of Shandong Institute of Agricultural Sciences, Si Erbi was introduced to Huimin and Linqing two cotton districts in 1948 and Sri Lanka Wu love introduced to Jiaodong and Texas two cotton districts in 1950 and 1951. From the winter of 1953, from Degradation to varying degrees has taken place in cotton samples collected everywhere. Sri Lanka two