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作者	单位
朱文达¹，何燕红² ，李林¹，魏守辉³，喻大昭¹	（1. 湖北省农科院植保土肥所，湖北武汉 430064； 2. 华中农业大学园艺林学院，湖北武汉 430070；3.中国农业科学院植物保护研究所，北京 100193）

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中文摘要:

为了研究除草剂混配对小麦田间杂草的防效，测定了15%顶尖WP或6.9%骠马EW 与20%氯氟吡氧乙酸EC混配对小麦田杂草的防效、田间透光率、杂草对水肥的吸收量和小麦产量。结果表明，除草剂混配对小麦田间杂草的综合密度防效和综合鲜重防效分别达到98.21%～100.00%和99.46%～100.00%，显著优于单剂的防效。除草剂混配能有效抑制杂草的株高，顶尖WP与最低剂量的氯氟吡氧乙酸混配，野燕麦即被全部防除，大巢菜和猪殃殃的株高亦显著降低。除草剂混配使用能显著提高小麦田间不同部位的透光率，小麦顶部透光率比对照增加54.08%～57.20%；离地50 cm的透光率比对照增加47.21%～52.73%；离地10 cm的透光率比对照增加 22.84%～27.44%。除草剂混配使用降低了杂草对水肥的吸收，高剂量的组合中，杂草的水肥含量均降为零。除草剂混配喷施后增产效果显著，增产率达到124.63%～172.88%。

英文摘要:

The control effects, the light penetration rate, the absorbtion of nutrition elements and moisture, and the yields of wheat were investigated to evaluate the application prospect of the mixture herbicide of fluroxypyr with Topik or puma super to enlarge the weeds control spectrum of fluroxypyr and control the main monocotyledon and dicotyledon weeds in wheat fields. The results showed that the mixture herbicide markedly enhanced density control effects for main weeds from 98.21% to 100.00% and fresh weight control effects from 99.46% to 100.00%, and better than the control effects of single dose. The mixture herbicide significantly decreased the height of weeds. The heights of Vicia sativa and Galium aparine var. tenerum were obviously lowered to 57.44cm and 59.21cm using the mixture of Topik and the minimum dose of fluroxypyr with the whole control of Avena fatua. It improved the light penetration rate (LPR) at different height of field. The LPR was increased by 54.08% to 57.20% on the top of the wheat, 47.21% to 52.73% at 50 cm upon the ground, and 22.84% to 27.44% at 10 cm upon the ground. It also reduced the weeds absorption of water and nutrient elements. The concentration of water and nutrient elements in weeds was down to zero at higher dose treatment of mixture herbicide. Finally, it was resulted in a remarkable acceleration of yield enhancement using the mixture herbicide with the increased rate of yield from 124.63% to 172.88%.

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