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作物需水规律是指作物需水量大小和需水情况变化的一般规律。它是合理灌排、适时适量地满足作物需要,确保高产稳产的重要依据。作物需水量大小及其变化规律,决定于作物特性、地区自然条件和农业技术措施等。各种作物或同一种作物在不同地区、不同年份、不同栽培条件下的需水量也各不相同,但又有其大致的范围和一般规律。例如,凡生长期长,叶面积大,生长速度快,
The law of crop water demand refers to the general rules of crop water demand and water demand changes. It is an important basis for irrigating and arranging irrigation rationally and timely and appropriately to meet crop needs and ensure high and stable yield. The size of crop water demand and its variation are determined by crop characteristics, regional natural conditions and agricultural technology measures. The water demand of various crops or the same crop in different regions, different years and different cultivation conditions are also different, but they have their general scope and general rules. For example, where a long period of growth, leaf area, rapid growth,