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浙江省杂交水稻制(繁)种生产,由70年代的春繁秋制改为夏季制繁种后,由于制种产量高、纯度好,已成为我县农业生产的一大优势。但是,由于单(夏)季制种,收割以后(9月中旬)不能再种晚稻,不但大量温、光资源白白浪费,而且造成制种地区种、粮矛盾突出。另外,单季制种成熟阶段,往往遇到连阴雨天气及制种田多次使用九二○等激素,致使黑粉病粒、芽谷大量发生,严重降低了种子品质。为了解决以上问题,我们通过对抽穗扬花期气象分析和隔离区茬口的合理调整,在1987年进行了小面积早夏制(后季种植晚粳、糯稻)探索试验,增种了一季晚稻。
Since the production of hybrid rice from Zhejiang Province in the 1970s was changed from spring and autumn to summer, it has become a major advantage of agricultural production in our county due to its high seed yield and good purity. However, due to the single (summer) seasonal planting, the late rice can not be planted after the harvest (mid-September), not only was the large amount of warm and light resources was wasted, but also the contradiction between species and grain in the seed production areas was prominent. In addition, the mature stage of single-season seed production, often encounter even the rainy weather and the system of production repeatedly used 920 and other hormones, resulting in a large number of black powder sickle, shoots a large number of cereal, seriously reducing the quality of the seed. In order to solve the above problems, we carried out the exploration experiment of small-area early summer system (late japonica rice and glutinous rice) in 1987 through the meteorological analysis of heading and flowering periods and the rational adjustment of the isolation crop stubs, and added one season late rice.