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适期和适量进行化学调控是棉花达到高产的关键措施之一。本文采用三因子D—饱和最优回归设计方法,研究了一熟春棉从蕾期至花铃盛期3次喷缩节安溶液对产量的影响,建立了缩节安使用时期和用量的优化模型。分析表明,在1990和1991两年不同气候年型条件下,根据模型初步筛选出每公顷皮棉1500公斤左右,株高生长在95cm以下,使用缩节安的最佳用量。1990年因中期雨水偏多,每公顷喷缩节安的综合取值为:蕾期3.0～14.4克,初花期24.9～39.0克,花铃盛期46.5～62.0克。1991年中、后期偏旱,故每公顷喷缩节安的综合取值为蕾期4.5～14.5克,初花期9.0～34.4克,花铃盛期24.5～54.6克。此模型能为获得较理想的棉花株型和群体结构以及最佳产量提供合理调控的定量依据。
Appropriate and appropriate amount of chemical control is one of the key measures to achieve high yield of cotton. In this paper, three-factor D-saturation optimal regression design method was used to study the effect of three spray-sprinkling solutions on the yield of spring cotton from bud stage to flowering stage, and the optimization of dosage and period model. The analysis shows that under the different climatic conditions of 1990 and 1991, according to the model, about 1500 kg of lint per hectare was initially screened, and the optimal growth of plant height was below 95 cm. In 1990, due to the mid-term rainfall is too much, the comprehensive value of spray safety per hectare is: bud stage 3.0 ~ 14.4 grams, the first flowering 24.9 ~ 39.0 grams, 46.5 ~ 62.0 grams of flowering period. In 1991, the latter part of the drought, so the injection and security per hectare synthetical value for the bud stage 4.5 ~ 14.5 grams, flowering 9.0 ~ 34.4 grams, 24.5 ~ 54.6 grams of flowering period. This model can provide a quantitative basis for the reasonable regulation of cotton plant type and population structure and the optimal yield.