| 摘要 |
<p>The present invention relates to a preemergence method of selectively controlling weeds in crops of cereals, and to a composition therefor. Up to now it has been virtually impossible to use s-triezines, phenylureas and other photosynthesis inhibitors as preemergence herbicides in cereals, especially wheat and barley, because of their too potent action. This invention solves the problem by providing a composition for the preemergence control of weeds which, in addition to containing such photosynthesis inhibitors, contains a diphenyl ether or pyridylphenyl ether derivative as antagonistic component which neutralises or greatly diminishes the harmful action in cereals. In particular, the admixture of known nuclear-substituted phenoxyphenoxyalkanoic acid derivatives or pyridyl-(2)-oxy-phenoxyalkanoic acid derivatives to commercially available 4,6-bis-alkylamino-s-tria-zines and phenylureas can influence the herbicidal action of these latter so advantageously that, in preemergence application, they no longer damage cereals when employed in conventional concentrations, without losing their potent action against weeds.</p> |
