NC-620和稻杰对稻田常见杂草的防效

采用毒土法和喷雾法研究了不同剂型和用量NC-620和稻杰对水稻田稗草、千金子和三棱草的田间防除效果。结果表明,对稗草的株防效从高到低分别是2.5%稻杰、NC-620（4%TB）、有效成分为（下同）100 g/hm^2NC-620（33%WG）和80 g/hm^2NC-620（33%WG）。NC-620对千金子有一定的防效,防效从高到低是NC-620（4%TB）、100 g/hm2NC-620（33%WG）和80 g/hm^2NC-620（33%WG）,2.5%稻杰对千金子无防效。三棱草与稗草的株防效基本相同,2.5%稻杰在防除效果上较NC-620好,45 d后防效高达90%以上。稗草、千金子和三棱草鲜重防效与株防效的结果基本相同。

Herbicidal Effect of Metazosulfuron on Barnyard Grass,Asian Sprangletop and Rhizoma Sparganii Weed in Rice Field

To determine the herbicidal effect of different dosages and formations of metazosulfuron （NC-620） on barnyardgrass （Echinochloa crucrusgalli （L.） Beauv ） , Asian sprangletop （Leptochloa chinensis （L.） Nees） and Rhizomain sparganii weed （Scirpus planiculunis Fr. schunidt） in rice field, field experiment was conducted through method of pesticide-clay mixture and spray. Plant control effects on barnyard grass were 2.5% penoxsulam〉 metazosulfuron （4%TB） 〉 100 g a.i./hm/ metazosulfuron （33%WG） 〉 80 g a.i./hm2 metazosulfuron （33%WG） . NC-620 conferred a certain plant control effect on Asian sprangletop. Plant control effects on Asian sprangletop were metazosulfuron （4%TB） 〉 100 g a.i./hm2 metazosulfuron （33%WG） 〉 80 g a.i./hm2 metazosulfuron （33%WG） individually, though 2.5% penoxsulam had no plant control effect on Asian sprangletop. Plant control effect on Rhizomain sparganii was similar to that on bamyardgrass. 2.5% penoxsulam control effect was more than 90% after 45 d, better than NC-620. Results on control effect in fresh weight showed the same trend with those on plant control effect.