除草剂混配施用对棉田常见杂草的防除效果

为了检验除草剂防除棉田杂草效果,以三氟啶磺隆、嘧草硫醚和精喹禾灵之间不同剂量的混配施用.试验表明：三氟啶磺隆和精喹禾灵两种混用及三氟啶磺隆、嘧草硫醚和精喹禾灵3种混用均对棉田杂草都有较好的防除效果.施药后7天杂草表现药害症状.施药后20天,三氟啶磺隆与精喹禾灵两种除草剂混用,随着三氟啶磺隆用量的增加对禾本科杂草的防效由89.2％增加到95.3％,对阔叶类杂草的防效由86.3％增加到94.9％,总体株防效由87.8％增加到95.2％;三氟啶磺隆与精喹禾灵、嘧草硫醚混剂3种除草剂混用,在精喹禾灵用量相同的条件下,增加三氟啶磺隆或嘧草硫醚的用量,对禾本科杂草、阔叶类杂草、杂草总体株防效均提高.施药后40天的株防效和鲜重防效均80％以上,说明混配药剂的持效期较长.

Controlling Effect of Three Kinds of Herbicides Mixed Application on Common Weed in Cotton Field

In order to test the controlling effect of herbicide on weed in cotton field, the author mixed trifloxysulfuron, pyrithiobae - sodium and quizalofop - p - ethyl in different doses. The test showed that： mixing trifloxysulfuron and quizalofop - p - ethyl had same controlling effect with mixing trifloxysulfuron, pyfithiobac - sodium and quizalofop - p - ethyl. Weeds showed injury symptoms after 7days, 20 days after the application, trifloxysulfuron mixed with quizalofop - p - ethyl, Controlling effect of gramineous weeds increased from 89.2 % to 95.3 % with the increasing of trifloxysulfuron ; effective to control broadleaf weeds increased from 86.3 % to 94.9 %, the overall plant efficiency increased from 87.8 % to 95.2 % ; Mixture of 3 herbicides, in the condition of same amount of quizalofop - p - ethyl, added the content of tfifloxysulfuron or pyrithiobac - sodium, it could improved the controlling effect on gramineous weeds, broadleaf weeds, weed overall plant.40 days after spraying, plant prevention effect and fresh weight controlling effect were above 80%, the longer effective period mixed reagent.