Abstract

The effectiveness of phosphorus (P), potassium (K), indole-3-acetic acid (IAA), gibberellic acid (GA₃), zeatin (Z) and their combinations on chlorophyll a, b and total chlorophyll production was investigated in the hydroponic nutrient solution. The cotton plants were cropped without hormones application in different levels of P and K in the first cropping and with hormones application in the second cropping in high level of PK. In the first cropping, low K and high PK significantly influenced formation of chlorophyll a, b and ab from 83 to 91 days after planting (DAT) while the application of GA₃, IAA, Z and IAA x GA₃ x 2Z treatments significantly increased chlorophyll a, b and ab only at 80 DAT. However, two cotton varieties planted in two cropping seasons expressed different abilities in time to promote chlorophyll formation.

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