冀中南谷田杂草发生与除草剂筛选试验

Occurrence of Weeds in Foxtail Millet Field and Herbicide Screening in Hebei South-central Region of Hebei Province

以冀中南谷田杂草为对象,探讨了谷田杂草的发生规律与除草剂筛选试验。结果表明:不同播期的谷田杂草种类基本一致。春播谷田杂草发生有3个峰期,5月中旬以双子叶杂草为主,6～7月份以单子叶杂草为主;夏播谷田杂草发生仅1个峰期,主要在7月上中旬,以单子叶杂草为主。化学防除以44%谷友WP剂量1 800g/hm2为最佳,药效明显高于10%单嘧磺隆WP、50%扑灭津WP与2,4-D丁酯EC;春播谷田施药后79d对单、双子叶杂草的株数防效与鲜重抑制率分别为49.19%、96.76%与96.01%、96.03%。夏播谷田在施药后55d对单、双子叶杂草的株数防效与鲜重抑制率分别为41.13%、92.34%与93.39%、98.15%。

Occurrence of Weeds in Foxtail Millet Field and Herbicide Screening in Hebei South-central Region of Hebei Province were investigated in this study.The results showed that weed species with the different sowing dates in foxtail millet fields were basically the same.The occurrence of weeds in spring sown millet fields had three peaks,that is,in middle ten days of May with primarily dicotyledonous weeds,in June and in July with mainly monocotyledonous weeds.The occurrence of weeds in summer sown millet fields had only 1 peak,that is in the early to mid July with primarily monocotyledonous weeds.Chemical control of weeds by the dose 1 800g/hm2 of monosulfuron plus propazine 44% WP was best,with the efficacy of significantly higher than monosulfuron 10% WP,propazine 50%WP and 2,4-D butyl ester.In spring-sown millet fields,at 79 d after applying herbicides control effect and fresh weight inhibition rate to monocotyledonous and dicotyledonous weeds were 49.19%,96.76% and 96.01%,96.03%,respectively.In summer-sown millet fields,at 55 d after applying herbicides control effect and fresh weight inhibition rate to monocotyledonous and dicotyledonous weeds were 41.13%,29.34% and 93.39%,98.15%,respectively.