Abstract
Foliar application of pendimethalin herbicide (5 ppm) to three weeks old seedlings of Zea mays L. and GossypiumhirsutumL. resulted in a decreasing trend of chlorophylls a an b in both seedlings compared to controls. Chlorophyll b excelled chlorophyll a in maize, whereas in cotton a reverse manner was observed. The chlorophyll ratio a/b in cotton surpassed the chlorophyll ratio in maize.
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