双唑草腈对双季水稻田杂草的防效及后茬作物的影响

Efficacy of pyraclonil on weeds in double-season rice fields and the effects on following crops

通过大田试验测定了双唑草腈及其与苄嘧磺隆、五氟磺草胺和扑草净混用对双季水稻田杂草的防效,并评价了双唑草腈对水稻及后茬作物的安全性。结果表明:2%双唑草腈GR对双季水稻田杂草具有良好的防治效果,210、315和420 g/hm 2处理药后30、45 d对禾本科杂草和阔叶类杂草的防效均在87%以上,低剂量140 g/hm 2处理药后30、45 d对双季水稻田禾本科杂草和阔叶类杂草防效均在75%以上。2%双唑草腈GR 140、210、315和420 g/hm 2处理对后茬作物小白菜、马铃薯、小麦、紫云英和冬季油菜生长安全。2%双唑草腈GR以140、210 g/hm 2分别与苄嘧磺隆或五氟磺草胺混用,药后30、45 d对禾本科杂草和阔叶杂草的防效均在93%以上,显著优于2%双唑草腈GR相应浓度的单剂处理,其中2%双唑草腈GR 210 g/hm 2+10%苄嘧磺隆WP 30 g/hm 2混用可以达到2%双唑草腈GR 315 g/hm 2处理的防治效果,且对水稻生长安全;单独施用50%扑草净WP 450 g/hm 2对双季稻田禾本科杂草的防效较差,其与2%双唑草腈GR混用后防效显著提高,但对水稻生长有较强的抑制作用。综上,双唑草腈及其与苄嘧磺隆、五氟磺草胺混用对双季水稻安全,可在双季水稻田推广应用。

The efficacies of pyraclonil 2%GR and its mixture with bensulfuron-methyl,penoxsulam and prometryn on weeds in the fields of double-season rice were tested,and the safety of pyraclonil on rice and following crops were evaluated.The results showed that pyraclonil 2%GR has a good control effect on weeds in double-season rice fields,with the efficacies above 87%at the dosage of 210,315,and 420 g/hm 230 and 45 days post treatment.The treatment with low-dose of 140 g/hm 2 had more than 75%control effects on grass weeds and broad-leaved weeds 30 and 45 days later.The treatments with pyraclonil 2%GR 140,210,315 and 420 g/hm 2 were safe for the growth of following crops,including pakchoi,potato,wheat,milk vetch and winter rape.The mixtures of 140 g/hm 2 and 210 g/hm 2 pyraclonil 2%GR with bensulfuron-methyl or penoxsulam showed an efficacy of above 93%against grass weeds and broad-leaved weeds 30 and 45 days post treatment,which were significantly better than that of pyraclonil 2%GR treated alone at 140 g/hm 2,210 g/hm 2.In addition,pyraclonil 2%GR 210 g/hm 2+bensulfuron-methyl 10%WP 30 g/hm 2 can achieve the effect of pyraclonil 2%GR 315 g/hm 2,and it is safe for rice growth.The application of prometryn 50%WP 450 g/hm 2 alone had a poor control effect on the grass weeds in the double cropping paddy field.The control effect of prometryn 50%WP was significantly improved when mixed with pyraclonil 2%GR,but showed a strong inhibitory effect on rice growth.Therefore,pyraclonil and its mixture with both bensulfuron-methyl and penoxsulam have an excellent application prospect in the field of double-season rice.