http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Influence of mepiquat chloride and nitrogen on growth, nutrient uptake, and lint yield of cotton (Gossypium hirsutum L.)
xviii, 218 leaves : illustrations ; 29 cm
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^-1. Lint yield was greatest (1412 kg ha^-1) at 180 kg N ha^-1 and least when no N was applied (646 kg lint ha^-1). Conversely, lint yield increase per unit of applied N decreased as N rates increased, ranging from 7.04 to 4.24 kg lint kg^-1 N at 45 and 180 kg N ha^-1, respectively. 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^-1 delayed maturity and increased plant height, but did not affect yield or total dry matter accumulation of mature cotton plants compared to the preplant application. 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^-1) at the 180 kg N ha^-1 rate containing 171, 32, and 189 kg ha^-1 of N, P, and K, respectively. Cotton seed at the highest N rate contained 71, 14, and 31 kg K ha^-1 of N, P, and K, respectively. The seed required to produce 100 kg lint removed 5 kg N, 1 kg P, and 2 kg K. Micronaire, fiber length, strength, and elongation were not affected by MC treatment.