【摘要】 <正> 在土壤电导的研究中,最常使用的方法是采取土样后加一定量的水分,然后用交流二极法进行测定。为了判断在田间情况下植物所处的土壤环境,进行原位测定是较为可取的。土壤“盐分传感器”的使用可以达到这个目的。但是盐分传感器的反应很慢,仅适更多还原

【Abstract】 A direct-current four-electrode method for the measurement of electrical conductivity of soils in situ was devised. Red copper electrodes and a high voltage (90 V) were used. Measurements were made several minutes after the insertion of electrodes into the soil, and readings were taken 10—20 seconds after the passing of current through the circuit. It was found that electrical conductivity values measured by the proposed method were nearly equal to those measured by alternating-current fourelectrode method, with a mean proportional factor of 1.006 for 31 measurements, and had a close relationship with those measured also in situ by conventional two-electrode method. It is shown by the application of this method that, in addition to salinity and the distribution of soluble salts in the profile for salinized soils, electrical conductivity may be used as a comprehensive index of soil fertility of the cultivated layer of acid and even neutral soils as well as base status of the profile, and also reflects the effect of fertilization the on content of soluble ions of soils.更多还原