【摘要】 于2014年运用"七级目测法"及"W"形倒置9点取样法,对江苏省宝应县不同土壤类型麦田杂草种类、田间杂草优势种群、分布状况进行了调查,并通过田间试验验证了不同除草剂对优势杂草种群的防效。结果表明,宝应县麦田杂草为禾本科及阔叶类杂草并存,其中以禾本科为主,主要涉及13科28种,优势种为牛繁缕、日本看麦娘、菵草,其发生频度分别为66.6%、33.0%、22.0%;7.5%啶磺草胺WG与8%炔草酯EW 900 m L/hm2及以上混用、单用8%炔草酯EW 600 m L/hm2及以上、5%唑啉·炔草酸EC 1 200 m L/hm2、15%炔草酯WP480 g/hm2处理区在药后45 d,其对菵草株防效均在95%以上,鲜质量防效均在94%以上,明显好于单用7.5%啶磺草胺WG 187.5 m L/hm2、6.9%精唑禾草灵EC 1 500 m L/hm2处理区。更多还原

【Abstract】 Species,dominance and distribution of weeds in wheat fields in Baoying County with different soil pattern were investigated in 2014 using a sampling method based on visual scoring with a seven point scale at nine field spots following an inverted W- pattern. The efficacy of herbicides on dominant weeds was also tested in a field experiment. Gramineae and broadleaf weeds were the most common weeds in wheat fields,the gramineous weeds being the most dominant species.Thirteen families and 28 species of weeds were found; the three most dominant weed species were Malachium aquaticum,Alopecurus japonicus,and Beckmannia syzigachne,with a frequency of 67%,33% and 22%,respectively. The mixture of pyroxsulam 7. 5% WG and clodinafop- propargyl 8% EW at 900 m L/hm2,as well as clodinafop- propargyl 8% EW at600 m L/hm2,pinoxaden·clodinafop- propargyl 5% EC at 1 200 m L/hm2,clodinafop- propargyl 15% WP at 480 g/hm2 were applied to control B. syzigachne. Efficacy of the four treatments was above 95%,and controlled the weed at above94% after 45 days. Efficacy was superior than that obtained with Pyroxsulam 7. 5% WG at 187. 5 m L/hm2 and fenoxaprop- P- ethyl 6. 9% EC at 1 500 m L/hm2.更多还原