所谓允许喷灌强度是指等于或略小于在一定喷水量所需喷洒历时末土壤入渗速度的喷灌强度。当用允许喷灌强度喷灌时,土壤结构基本上不遭到破坏,喷洒的水量能近乎全部地渗入土中,土壤表面不产生水洼或迳流。允许喷灌强度是喷灌系统规划设计和运用管理的基本依据之一,也是喷灌设备特别是喷头设计制造的重要性能参数。土壤允许喷灌强度从理论上说不是一个定值,这是由于土壤入渗能力是确定允许喷灌强度的依据,而土壤入渗能力是随土壤质地、土壤结构状况、耕作方法、施肥水平、作物生育阶段、喷灌技术和喷洒历时等因素而异。我国自1977年起,先后有江苏农学院、山西省水科所、黑龙江省水科所、辽宁省水科所、河 Permissible sprinkler strength is the sprinkling strength equal to or slightly less than the soil infiltration rate at the end of the spray required to spray for a given amount of water. When irrigated with permissible sprinkling intensity, the soil structure is essentially not destroyed, the amount of water sprayed into the soil can almost completely penetrate into the soil, and the surface of the soil does not generate puddles or stagnant water. Sprinkler irrigation intensity is allowed to sprinkler system planning and design and application of management is one of the basic basis, but also sprinkler irrigation equipment, especially nozzle design and manufacture of important performance parameters. Permissible irrigation intensity of soil is theoretically not a definite value because soil infiltration capacity is the basis for determining the intensity of inflow irrigation. Soil infiltration capacity varies with soil texture, soil structure, farming method, fertilization level, crop growth Stage, sprinkler technology and spray lasted and other factors vary. Since 1977, our country has successively Jiangsu Agricultural College, Shanxi Water Institute, Heilongjiang Water Institute, Liaoning Province Water Institute, River