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Physiological, Growth and Yield Responses of Cotton to Mepplus and Mepiquat Chloride

Duli Zhao and Derrick Oosterhuis


 
ABSTRACT

An important objective for using plant growth regulators in cotton is to balance vegetative and reproductive growth and to improve lint yield. A 2-year field study was conducted to determine physiological and yield responses of cotton plants to foliar applications of MepPlus and Mepiquat Chloride (MC). Compared with the untreated control, application of MepPlus and MC efficiently reduced plant height, improved leaf photosynthetic rate, and numerically increased lint yield. MepPlus and MC had very similar effects on plant growth and most physiological parameters investigated in this study. However, MepPlus seems to be more efficient in improving photosynthate partitioning into fruits than MC, resulting in slightly higher yields from MepPlus application.



Reprinted from Proceedings of the 1999 Beltwide Cotton Conferences pp. 599 - 602
©National Cotton Council, Memphis TN

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Document last modified Monday, Jun 21 1999