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旱地的关键问题是缺水,而解决水资源则相当艰难。因此,只能从提高降水利用率出发来增加作物产量。三伏期中大旱是旱源地区最易出现的问题,此期正值棉花生殖生长的高峰期。棉花品种的花铃期比较集中,单一的品种花铃期若与干旱期相吻合,对棉花产量影响甚大。为此,1991年笔者企图通过不同品种混作栽培,调控以上矛盾,使有限的自然降水生产力水平提高。
The key issue in drylands is water scarcity, and solving water resources is rather difficult. Therefore, crop yield can only be increased from the point of increasing precipitation utilization rate. The severe drought in the three-volt period is the most troublesome problem in the drought source area, which coincided with the peak of cotton reproductive growth. The bolls of cotton varieties are more concentrated, and if the single varieties of flowers are in accordant with drought period, they have a great impact on cotton yield. Therefore, in 1991, the author attempted to control the above contradictions by mixing and cultivating different varieties so as to increase the limited productivity of natural precipitation.