A plant growth regulator for cotton harvest, which contains as an active ingredient, a compound of formula (I): ##STR00001## wherein X is CH or nitrogen; Z is halogen; A is oxygen, sulfur, or NH; R.sup.1 is hydroxyl, C.sub.1 C.sub.7 alkoxy, C.sub.3 C.sub.7 alkenyloxy, C.sub.3 C.sub.7 alkynyloxy, C.sub.5 C.sub.7 cycloalkoxy, {(C.sub.1 C.sub.7 alkoxy)carbonyl}C.sub.1 C.sub.3 alkoxy, (C.sub.1 C.sub.7 alkylamino)oxy, {di(C.sub.1 C.sub.7 alkyl)amino}oxy, (C.sub.3 C.sub.7 alkylideneamino)oxy, C.sub.1 C.sub.7 alkylamino, di(C.sub.1 C.sub.7 alkyl)amino, C.sub.3 C.sub.7 alkenylamino, C.sub.3 C.sub.7 alkynylamino, C.sub.5 C.sub.7 cycloalkylamino, {(C.sub.1 C.sub.7 alkoxy)carbonyl}C.sub.1 C.sub.3 alkylamino, or (C.sub.1 C.sub.7 alkoxy)amino; R.sup.2 is hydrogen or methyl; and R.sup.3 is hydrogen, halogen, C.sub.1 C.sub.3 alkyl, or C.sub.1 C.sub.3 alkoxy.

 
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