稻秆覆盖结合除草剂减量化使用对移栽甜玉米田杂草的控制效果

Efficacy of Rice Straw Mulching Combined with Reduced Herbicide Rates for Weed Control in Transplanted Sweet Corn

为了明确稻秆覆盖结合除草剂减量使用对甜玉米田杂草控制效果及产量的影响,采用大田试验方法,将乙草胺、二甲戊乐灵按常量(田间常规推荐剂量)、半量(1/2常量)、1/4量(1/4常量)分别与稻秆覆盖相结合,研究不同处理对甜玉米田杂草发生及甜玉米产量的影响。结果表明:从甜玉米移栽至收获,若仅用稻秆覆盖对甜玉米田杂草的株防效、鲜质量防效分别为59.92%、74.10%;若将除草剂与稻秆相结合使用,从对总草的控制效果看,二甲戊乐灵常量、1/4量与稻秆相结合均不同程度好于乙草胺相应剂量与稻秆相结合的效果。二甲戊乐灵1/4剂量与稻秆相结合即对甜玉米田总草的株数、鲜质量防效达到了较好的效果,分别为69.56%、82.87%,且具有一定的增产效果,增产率为11.5%。

Field experiments were conducted to evaluate the weed control efficacy and impact on crop yield of rice-straw mulching in combination with herbicides at reduced rates in sweet corn.Acetochlor and pendimethalin were applied at a quarter,half and full recommended doses to a transplanting sweet corn field.Rice-straw mulching provided 60% and 74%weed control from transplant to harvesting based on weed density and fresh weight,respectively.Combining rice-straw mulching with acetochlor improved weed control more than with pendimethalin at the three doses evaluated.The good plant individual and fresh weight control effect of rice straw mulching combined with acetochlor at one fourth of the dose were 59.92%and 74.10%respectively.However,if the rice straw covering was combined with a quarter of the rec-ommended dose of pendimethalin,better control efficiency was achieved than when aceoachlor was combined with the rice straw mulching,with an efficiency of 69.56%and 82.87%,based on plant density and fresh weight,respectively.Yield of sweet corn increased by 10.3%.