Influence of mepiquat chloride and nitrogen on growth, nutrient uptake, and lint yield of cotton (Gossypium hirsutum L.).

摘要

A replicated field experiment was conducted on the Texas A&M University Research Farm during 1989 and 1990 to determine if nitrogen rate and time of nitrogen application interact with mepiquat chloride (MC) (1,1-dimethylpiperidinium chloride) treatment to influence cotton growth, nutrient uptake, and lint yield.;The multiple MC treatment increased average lint yield (2.6%) compared to the control. Lint yield increased significantly as N rates increased up to 135 kg N ha;Both the single and multiple MC treatments affected cotton as follows: increased earliness and chlorophyll concentration; decreased plant height (14%), number of main stem nodes, internode length, leaf area index and canopy light interception; did not affect dry matter accumulation, crop growth rate, or boll growth rate. Earliness decreased as N rates increased, but plant height, light interception, chlorophyll concentration and total dry matter accumulation increased. The split application of 180 kg N ha;Total uptake of N, P, and K by the aboveground cotton canopy was unaffected by MC treatment, but increased as N rates increased. Dry matter accumulation was greatest (10,187 kg ha