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我省高粱生产的主要杂交种是晋杂4号、晋杂5号、晋杂7号,十多年来杂交种纯度日益降低,杂株率一般为15-20％,每亩约减产100-150斤。目前采用的提纯方法是两圃制,即穗行圃和原种圃,提纯对象局限于亲本某一方,主要是提纯不育系,对恢复系单繁者甚少。据调查,晋中地区用提纯后的3A配制的晋杂4号、晋杂5号,典型株率为84-92％,尚未达到国家规定的一、
The main hybrids of sorghum production in our province are Jinza 4, Jinza 5 and Jinza 7, and the purity of hybrids has been declining steadily for more than 10 years. The rate of hybrid plants is generally 15-20% and the yield per mu is about 100- 150 pounds. Currently used purification method is two nursery, that is, sprouts nursery and the original nursery, purification is confined to one of the parent side of the object, the main purification of sterile lines, very few of the recovery system. According to the survey, Jinzhong area with purified 3A prepared Jin hybrid 4, Jin hybrid 5, the typical strain rate of 84-92%, has not yet reached the state regulations,