26%灭松·二甲(莎阔净)水剂水稻田间药效试验研究

Study on Control Effect of Herbicide 26% MCPA and Bentazone EW in Paddy Field

经两年两地田间小区对比试验,明确了26%灭松·二甲水剂药效和杀草谱,对水稻田多种恶性杂草雨久花、野慈菇、泽泻、狼巴草、萤蔺、扁秆草均有特效,除草效果稳定在90%以上,在莎草科杂草基数低于50株/m2的地块,每公顷用量585g(有效成分),超过50株的地块每公顷用量为702～780g(有效成分)即可。施药时期为插秧后20～30d(待阔叶和莎草科杂草出齐至20cm以下),施药前排水,对水450kg/hm2,如田间后期有高龄稗草需同时防治,可加二氯喹啉酸(快杀稗)一起喷雾,可达到一次用药全田无杂草的效果。

Results of two years experiment showed that a lot of grass in paddy field could be prevented by spray of 26% MCPA and Bentazone EW, such as: Monochoria korsakowii Regel et Maack., Sagittaria sagittfolia L., Alisma orientale(Sam.) Juzepcz., Bidens tripartite L., Scirpus juncoides Roxb., Scirpus planiculmis Fr. Schmidt., etc. The control effects reached 90%. The optimum dosage was 585 g per hectare when nutgrass flatsedge was less than 50 per m2. The dosage ranges 702 to 780 g when nutgrass flatsedge was more than 50 per m2. The herbicide was applied 20 to 30 days after transplanting. Water was drained off before spraying. The chemical was dissolved in 450 kg of water per hectare.