灌溉制度是农田水利规划以及进行用水管理、编制用水计划的基础,随作物种类、品种、自然条件及农业技术措施和灌水技术的不同而变化。通常计算法确定旱作物灌溉制度主要是依据农田水量平衡原理进行。 一、旱作物农田水量平衡 旱作物农田水量平衡是指旱田土壤水分在作物整个生育期任一时段上,计划湿润层内的来水量与去水量总量上的平衡。其表达式为: Irrigation system is the basis of farmland water conservancy planning and water management and water planning. It varies with crops types, varieties, natural conditions, agricultural technologies and irrigation technologies. The calculation method is usually used to determine the crop irrigation system is mainly based on farmland water balance principle. First, the dry farmland water balance The dry farmland water balance refers to dry soil moisture in the crop throughout the growing period of any period, the planned wetting layer within the amount of water and the amount of total water on the balance. Its expression is: