一个优良品种在生产上大面积推广后,由于环境、机械、人为混杂及天然杂交等多种因素的影响常引起退化。因此必须连续不断地进行提纯复壮,以保持良种的纯度和种性。为了进一步做好我区早稻当家品种的提纯复壮工作,1980年我们对全区地、县原种场所生产的广陆矮4号原种,进行了一次质量鉴定,取得了良好的结果,现总结于后。 A good variety in the production of large-scale promotion, due to environmental, mechanical, artificial hybrid and natural hybridization and other factors often lead to degradation. Therefore, it is necessary to carry out purification and rejuvenation continuously to maintain the purity and species of the elite. In order to further improve the recovery and rejuvenation of the early varieties of rice in our region, in 1980 we conducted a quality appraisal of the original species of Guangluan 4, which was produced in the same places in all the prefectures and counties, and achieved good results. After.