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科学研究和实践已经证明,土壤水分在萎蔫湿度到田间持水量之间,可以不同程度地为植物利用;而毛细管破裂含水量是植物最适含水量的下限,土壤含水量减少到毛细管破裂含水量或以下,对植物生长就有所阻滞。因此,毛细管破裂含水量是土壤水分状况的重要指标之一。栽培及灌溉排水实践中,需要经常测知该数值。但是,到目前为止,切实可行的测定毛细管破裂含水量的方法,还没有看到。利用土壤蒸发速度曲线测定土壤水分特性的方法,有着宝贵的理论意义。可是,由于温度和吸湿剂的浓度(随吸湿改变)难以控制,同时测定时间长(12小时以上),技术设备要求高,限制了它的应用范围。 笔者经过试验,认为采用细毛细管吸吮法,可以达
Scientific research and practice have proved that the soil moisture in the wilting humidity to the field between the water can be used to varying degrees for plants; and capillary rupture of water content is the lower limit of the plant optimum water content, soil moisture reduced to the capillary rupture of water content Or below, the growth of plants has been blocked. Therefore, the capillary rupture moisture content is one of the important indicators of soil moisture status. Cultivation and irrigation drainage practice, you need to constantly measure the value. However, to date, a practical method of measuring the water content of capillary rupture has not been seen yet. It is of valuable theoretical significance to use the soil evaporation rate curve to determine the soil moisture characteristics. However, due to the difficulty of controlling the temperature and the concentration of the hygroscopic agent (which varies with hygroscopicity) and the long duration of the measurement (over 12 hours), the technical equipment is demanding and limits its range of application. After the experiment, I believe that the use of thin capillary sucking method, up to