苄·二氯(苄嘧磺隆+二氯喹啉酸)复配依据及其在直播稻田的应用前景

Compound Basis of Bensulfuron-Methyl and Quinclorac and Prospect of Its Application in Direct-Seeded Paddy

就除草剂苄·二氯(苄嘧磺隆+二氯喹啉酸)对稗草的生物活性、共毒系数、配方依据,对水稻的安全性以及在直播稻田的应用效果进行了试验。结果表明,苄嘧磺隆和二氯喹啉酸复配,比单剂有显著的增效,尤以二氯喹啉酸和苄嘧磺隆在复配剂中的含量分别为34%和2%时增效最为显著。苄·二氯的6个配方对水稻株高、分蘖数和植株鲜质量无不良影响,安全性良好。苄嘧磺隆+二氯喹啉酸(18+150)g/hm2至(24+198)g/hm2对稗草、异型莎草、陌上菜和四叶萍的密度防效和植株鲜质量防效均达到优良水平。36%苄·二氯可湿性粉剂(WP)用于水稻直播田,在水稻2叶1心至3叶期处理,使用剂量162~270g/hm2(有效成分)对水稻生长无不良影响,安全性好。使用剂量216~432g/hm2对稗草、水蓼、陌上菜、鸭舌草和丁香蓼的密度防效和植株鲜质量防效均达到了优良水平。与单剂苄嘧磺隆和单剂二氯喹啉酸相比,36%苄·二氯WP的杀草谱提高,杂草整体防效得到改善。

The bio-activity of barnyardgrass, co-toxicity coefficient, compound basis, rice safety, and the effect of weed control in direct-seeded rice field treated with the compound of bensulfuron-methyl and quinclorac were studied. The compounds of bensulfuron-methyl and quinclorac for weed control were more effective compared with bensulfuron-methyl or quindorac individually, especially when the compound rate was 2 percent of bensulfuron-methyl and 34 percent of quinclorac. The six different rates of compounds had no influence on rice plant height, number of tillers or plant fresh weight. When the bensulfuron-methyl and quinclorac were used at the rates of (18+150) g/hm^(2) (in the active ingredient) to (24+198) g/hm^(2), they had a marked effect on controlling the weed density and plant fresh weight for 4 kinds of weeds. The compound of 36% wettable powder applied at 2- to 3- leaf stage in direct-seeded rice field, with the dosages of 162-270 g/hm^(2) was safe to rice. The dosages of 216-432 g/hm^(2) had a remarkable effect on 5 kinds of weeds. When the compound was applied in the direct-seeded paddy, the kinds of weeds controlled were increased and the control effect was improved.