Abstract
The plant growth regulator mepiquat chloride (1,1-dimethylpiperidinium chloride) is used to reduce vegetative growth in cotton. It is commonly used to control the side effects of optimization of inputs such as water and nitrogen. It has been shown that mepiquat chloride (MC) suppresses excessive plant growth by decreasing plant height, number of nodes, fruiting and vegetative branch lengths, and leaf area. A model was developed using data collected under controlled environmental conditions for a range of temperatures. Equations were developed to calculate the concentration of MC in the plant tissue on a daily basis after accounting for the dry-weight increments in plant tissue and abscission of plant parts. A set of stress factors was calculated to account for the reduction in growth of various cotton plant parts as a function of air temperature and tissue concentration of MC. The MC model was incorporated in a cotton simulation model, GOSSYM. The model simulations compared well with observed yields under a range of conditions.
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