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杂交制种直播技术是我县近年开始研究的一个新课题。由于杂交制种父母本的播种期存在差异,播后在一定时间内不能正常覆水上畦面,导致很多常用直播田除草剂无法应用于直播制种田除草。40%直播净可湿性粉剂是杭州天一农药化工厂开发生产的一种直播田及秧田专用除草剂,具有除草效果好、成本低、喷药后不需复水等优点。为了探索40%直播净可湿性粉剂在直播制种田对杂草的防除效果及其安全性,1999年我们在Ⅱ优46杂交直播制种田上进行了对比试验,现将试验结果初报如下:
Hybrid seed broadcast technology is my county in recent years began to study a new topic. Due to differences in the sowing date of the parental parents of hybrids, they can not be properly covered with water on a certain period of time after sowing, resulting in many commonly used direct seeding herbicides that can not be applied to direct-seeded farming for weeding. 40% of live broadcast net WP is developed and produced by Hangzhou Tianyi Pesticide Chemical Plant. It has the advantages of good weeding effect, low cost and no rewatering after spraying. In order to explore the effect of 40% live-net WP on weed control and its safety in direct-seeded farming, we conducted a comparative experiment on the field of “Ⅱ You 46” hybrid live-sowing in 1999. The preliminary results are as follows: