The present invention is to provide a novel picolinic acid derivative having the formula, ##STR1## (wherein R is a hydrogen atom, an alkyl group or others, R.sup.1 and R.sup.2 are the same or different, and are an alkyl group, an alkoxy group or others, X is a cyano group, a phenoxy group or others, Y is an oxygen atom or others, and n is 0 or 1) or a salt thereof; a method for preparing the same; and a herbicidal composition containing the same as an active ingredient. The picolinic acid derivative or the salt thereof of the present invention achieves an excellent herbicidal effect at a low dosage, and is effective for controlling the growth of various weeds in a wide range. The picolinic acid derivative or the salt thereof of the present invention can be applied to a paddy field, a cultivated field, a non-agricultural land and the like as a herbicidal composition.
本发明提供了一种新型的
吡啶甲酸衍
生物,其
化学式为, ##
STR1##(其中R是
氢原子,烷基或其他基团,R.sup.1和R.sup.2相同或不同,为烷基,烷
氧基或其他基团,X为
氰基,
苯氧基或其他基团,Y为
氧原子或其他基团,n为0或1)或其盐;一种制备方法;以及包含其作为活性成分的
除草剂组合物。本发明的
吡啶甲酸衍
生物或其盐在低剂量下实现了优异的除草效果,并且对于控制广泛的各种杂草的生长是有效的。本发明的
吡啶甲酸衍
生物或其盐可以作为
除草剂组合物应用于稻田、耕地、非农业用地等。