适宜滴灌春小麦的土壤含水率下限研究

Study on the Lower Limit of Soil Moisture Content Suitable for Drip Irrigation of Spring Wheat

土壤含水率下限,决定着灌水时间的开始、灌水量和灌水次数等灌溉指标,适宜土壤含水率下限的作物灌溉,避免了盲目灌溉,节约了水资源.从水分生产函数和作物水分利用效率2个方面讨论了适宜滴灌春小麦的土壤含水率下限,初步确定适宜滴灌春小麦的土壤含水率下限为田间持水率的55%~70%.

The lower limit of soil moisture determines the start time of irrigation,irrigation amount and frequency of irrigation systems and other indicators.Adopting the suitable soil moisture content lower limit for crop irrigation can avoid the blind irrigation,and save water resources.The lower limit of soil moisture content suitable for drip irrigation spring wheat was discussed from two aspects:water production function and crop water use efficiency,It is preliminarily determined that the lower limit of soil moisture content suitable for drip irrigation of spring wheat is 55%-70%of field water holding capacity.