17.5%草除·精喹禾灵乳油对油菜田杂草的控制作用

Weed Control Effect of 17.5% Benazolin & Quizalofop-p-ethyl in Rape Fields

为明确除草剂17.5%草除.精喹禾灵乳油在移栽油菜田的应用前景,研究了对油菜田杂草的控制作用及该药剂对田间光照强度和油菜产量的影响。结果表明:17.5%草除.精喹禾灵乳油对油菜田杂草具有较好的防除效果,药后第20天的总体防效为98.82%-99.94%,随时间的延长药效略有下降,120 d内的控草效果仍可达92%以上;17.5%草除.精喹乳油对田间主要杂草看麦娘Alopecurus aequalis、牛繁缕Malachium aquaticum及菵草Beckmannia syzigachne的防除效果都较好,用药后40 d对3种杂草的防效都在96%以上,120 d以内防效仍可以达到86%以上;使用17.5%草除.精喹乳油能显著提高油菜田间的透光率,随着用药量的增加,透光率逐渐上升;17.5%草除.精喹乳油的施用对油菜株高、千粒重没有显著影响,但对油菜第1分枝高度、单株分枝数和每分枝角果数影响较大,能显著提高油菜产量。

The weed control effects of 17. 5% benazolin ＆ quizalofop-p-ethyl and subsequent dynamics in rape fields, as well as the influence of 17. 5% benazolin ＆ quizalofop-p-ethyl on the sunlight and crop yield were studied to evaluate the application prospect of benazolin ＆ quizalofop-p-ethyl. The results showed that benazolin ＆ quizalofop-p-ethyl provided good control effects on weeds in rape fields, the overall effects ranged from 98. 82% to 99. 94%, twenty days after treatment（DAT）, decreased and maintained above 92% for 120 DAT with gradual decrease. The efficacy was higher on Alopecurus aequalis ,Beckrnannia syzigachne than Malachiurn aquaticum. Benazolin ＆ quizalofop-p-ethyl application significantly improved the light conditions in rapeseed field and the light penetration rate increased with the dosage of herbicide. The application of benazolin ＆ quizalofop-p-ethyl had no effect on the plant height and 1 000-seed weight, whereas the height of first branch, numbers of branches and siliquas were markedly influenced, resulting in a significant yield increase of rapeseed.