鲜食糯玉米田不同除草剂的除草效果及减量试验

Efficacy of Herbicides at Recommended and Reduced Doses in Fresh Waxy Corn

对1种苗前土壤处理除草剂和2种苗后茎叶处理除草剂在鲜食糯玉米田的除草效果和安全性进行评价。结果表明,960 g/L精异丙甲草胺EC以推荐用量土壤处理对马唐的防效最好,对酸模叶蓼封闭效果较差,减量20%和30%处理的总草株防效和鲜重防效有降低趋势,但与推荐用量无显著性差异。苗期10%硝磺草酮SC对所有杂草防效均较好,推荐用量药后35 d总草株防效和鲜重防效分别为98.19%、93.34%,减量30%和添加激健处理药后15、35 d的总草株防效和鲜重防效与推荐用量处理均无显著性差异;30%苯唑草酮SC除草效果不佳,推荐用量药后15 d总草防效仅为53.51%,药后35 d鲜重防效仅为13.00%~35.48%,减量30%或添加激健对防效均无显著性影响,激健增效作用不明显。所有试验处理均对浙糯玉14的生长安全。

Field studies were conducted with a pre-emergence and two early post-emergence herbicides to determine their efficacy and selectivity in fresh waxy corn.S-metolachlor(960 g/L)EC at its recommended dose effectively controlled Digitaria sanguinalis but failed to control Polygonum viviparum.Reducing the herbicide dose by 20%and 30%decreased efficacy based on weed density and weight,but without being significant different to the recommended dosage.At the seedling stage,10%mesotrione SC at its recommended dose effectively controlled all weeds;efficacy based on plant density and fresh weight after 35d were 98%and 93%,respectively.Reducing the mesotrione dose by 30%or adding Jijian did not affect its efficacy at 15 and 35 days after treatment.Topramezone 30%SC at its recommeneded dose only provided a 53%control after 15 d,and 13%to 35%based on fresh weight at 35 d after treatment.A dose reduction by 30%or the addition of Jijian did not affect efficacy.All the experimental treatments were selective to Zhonghuoyu 14.