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水分是世界上大部地区影响作物生长的主要因子。据估计,全世界约有36％的土地每年降雨量只有125—750毫米,被称为干旱至半干旱地区。而其他64％土地在作物生长季节也有不同程度干旱;可见干旱为害作物遍及全球。由于各种环境因素影响导致体内缺水而降低作物生产力,不但立苗弱或成苖毁灭,也容易感染病虫害,使植株生理生化代谢作用发生变化,以及粮食、饲料、纤维、油料等作物籽粒品质变劣。
Moisture is a major factor affecting crop growth in most parts of the world. It is estimated that about 36% of the world’s land receives only 125-750 millimeters of rainfall each year, which is called arid to semi-arid areas. The other 64% of the land has varying degrees of drought in the crop growing season; it can be seen that the drought-harmed crops are all over the world. Due to various environmental factors leading to water shortages in the body and reduce crop productivity, not only stand weak seedlings or Chenghuang destruction, but also susceptible to pests and diseases, the physiological and biochemical metabolic changes in plants, and grain, feed, fiber, oil and other crop grain quality Worse.