Effects of several commercial plant growth regulator formulations on yield and allelochemicals of cotton (Gossypium hirsutum L.)
1994
Hedin, P.A. | McCarty, J.C. Jr
In recent years, a number of kinetin-based commercial plant growth regulators have been evaluated for their effects on various crop plants. In a study at Mississippi State during 1986-1992, five commercial plant growth regulators and urea were evaluated as foliar sprays on growing cotton (Gossypium hirsutum L.) plants for their effects on yield, agronomic traits, and pest allelochemicals. Of the five tested, the activities of three (Burst, Foliar Triggrr, and Maxon) were attributed by their providers to cytokinins. FPG-5 contained cytokinins, IAA, GA, and several inorganic micronutrients, and PG-IV contained IBA, GA, and micronutrients, but no cytokinins. FPG-5 and Foliar Triggrr caused statistically significant increases in yield, but only in 1992. The foliar application of urea had a consistently negative effect on yield. Formulations containing IAA/IBA, GA, and inorganic micronutrients did not appear to cause more positive yield trends than those whose potencies were attributed to their cytokinin content. Positive trends in bud gossypol were observed upon treatment with Burst, Foliar Triggrr, and PG-IV.
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