一、引言正确地确定农作物灌溉制度和田间耗水量是农田水利工作中重要課題之一。研究这一問题,对子灌溉工程的規划和管理,对我国的水利資源的开发和綜合科用,以及指导农作物的田间管理有着重大意义。农作物的灌溉制度一般是指作物生育期內的灌水次数、灌水时期、灌水定額和灌溉定額;对水稻来說,还应包括田面的水分状况(长期淹灌、湿潤灌溉、以及 I. INTRODUCTION Correctly determining crop irrigation system and field water consumption is one of the important topics in farmland water conservancy work. To study this issue is of great significance to the planning and management of sub-irrigation projects, to the development and comprehensive utilization of water resources in our country, and to the field management of crops. Crop irrigation system generally refers to the number of irrigation during the growing period of the crop, irrigation period, irrigation quota and irrigation quota; for rice, it should also include the surface water conditions (long-term flooding irrigation, wet irrigation, and