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Evaluation of Several Plant Growth Regulators in Louisiana

E. P. Millhollon and J. C. Waters


 
ABSTRACT

Field trials were conducted at Louisiana Agricultural Experiment Station's Red River Research Station in Bossier City, Louisiana, to examine the effects of the plant growth regulators Early Harvest, PGR IV, Maxon, and Stimulate applied at two manufacturer's recommended rates and timing schedules on cotton seedling growth, fruiting, and yield. Compared to an untreated control, none of the plant growth regulators had a significant effect on seedling height or weight. Although results indicated that some plant growth regulators had an effect on fruit retention, the effects were not consistent from one plant mapping date to the next and the final plant mapping indicated none of the plant growth regulators significantly increased fruit retention compared to the untreated control. However, four plant growth regulator treatments significantly reduced the plant height:node ratio at the final plant mapping. These treatments were PGR IV applied at 4 oz./A in-furrow at planting (IF), at pinhead square (PHS), and at early bloom (EB), Stimulate applied at 2 oz./A at IF, 3 oz./A at PHS, and 4 oz./A at EB, Stimulate applied at 4 oz./A at EB and EB plus 14 days, and Maxon applied at 4 oz./A at PHS and EB. None of the treatments had a significant effect on seed cotton yield compared to the untreated control.



Reprinted from Proceedings of the 1997 Beltwide Cotton Conferences pp. 1472 - 1474
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998