几种除草剂防除苜蓿地杂草的试验

Trials of several herbicides on weeds in alfalfafield

苜蓿地中以马唐、狗尾草等禾本科杂草为主 ,其鲜重占整个杂草鲜重的 90 .0 4 %～ 97.84 %。每单位重量的干草中 ,杂草所占的比例为 6 6 .5 7%～ 76 .3%。盖草能、金豆和普施特 3种除草剂在不同剂量下对上述杂草防除结果表明 :各处理均比对照有不同程度的增收。 5 %普施特水剂增收较为明显的是水平 4 (用药量为 2 4 0 0ml hm2 ) ,比对照增加收入的比例为 171.2 %～ 174 .9% ;4 %金豆增收较为明显的为水平 3(用药量为 15 0 0ml hm2 ) ,比对照增加收入的比例为 193.9%～ 198.1% ;12 .5 %盖草能增收较为明显的为水平 2 (10 5 0ml hm2 )、水平3(135 0ml hm2 ) ,比对照增加收入的比例分别为 2 0 0 .9%～ 2 0 2 .4 %和 196 .6 %～ 198.5 %。

Common crabgrass, green bristlegrass were the main weeds in the alfalfa field, their fresh was accounted for 90.04～97.84%in total weed fresh weight. Herbicides of Haloxyfopmethyl, Jindou and Imazethapyr were applied at different dosage. The results showed that all threeherbicides had different control effects. compared to control, in the dosages of 5% Imazethapyr 2400 ml/hm 2 , 4% Jindou 1500 ml/hm 2, 12.5% Haloxyfopmethyl 1050 ml/hm 2, the income was significantly increased by171.2%～174.9%, 193.9%～198.1%and 200.9%～202.4%respectively