【摘要】 从作物需水量的基本概念出发，以水量平衡原理为基础，建立了模拟农田根层土壤水循环的计算机模型-ISAREG.这一模型具有多种功能，可模拟根层土壤水分变化，评价给定的灌溉制度，计算作物需水量和灌溉需水量，也可用以制订多种供水限制条件下的优化灌溉制度．用望都灌溉试验站的小麦、玉米、棉花3种作物两年的试验观测资料对上述模型进行了验证．更多还原

【Abstract】 ISAREG is an irrigation scheduling simulation model based on the concept of crop water requirements and soil water balance.It can be used to simulate the time variation of soil moisture in root zone, to evaluate a given irrigation schedule, to calculate crop water requirements and irrigation requirements, and to define an optimal irrigation scheduling under limited water availability. In this paper , the model was validated for three crops (winter wheat, summer maize and cotton)by comparing observed and simulated soil water contents using the data from Wang-Du irrigation experimental station. The crop coefficients in different growing stages of three crops were determined by simulation of large number of deficit irrigation treatments and comparing the soil moisture simulated values with the lbserved one.更多还原