Horváth János, Kátai László, Szabó István, Korzenszky Péter
Institute of Technology, Hungarian University of Agriculture and Life Sciences, Páter K. 1, H-2100 Gödöllő, Hungary.
Sensors (Basel). 2024 May 22;24(11):3296. doi: 10.3390/s24113296.
The measurement of electrical conductivity (EC) has long been a tool for understanding soil properties. Previous studies concluded that EC measurement is not an ion-selective method, but these papers did not address the measurement frequency. An experimental tool and method were developed for semi-factory conditions in a large-scale soil trough at the Institute of Technology of the Hungarian University of Agricultural and Life Sciences. A specially designed and built test apparatus mounted on the tractor's three-point hitch was used as a measuring device. The wear-resistant steel elements of the measuring device were also the sensors for measuring EC. This paper describes the conditions of the measurement series, the measurement results, and our conclusions from the experiments with the soil sensor. Different characteristics were measured in soil moistened with K and Ca solutions at different concentrations. The EC values show an increasing tendency with increasing salt concentration, and we also found that the rate of change of EC is different for different solution ratios. Based on our measurements, we found that the best method to isolate concentration differences is to use the test frequency range 20 Hz-250 kHz.
电导率（EC）的测量长期以来一直是了解土壤性质的一种工具。以往的研究得出结论，电导率测量不是一种离子选择性方法，但这些论文没有涉及测量频率。在匈牙利农业与生命科学大学理工学院的一个大型土壤槽中，针对半工厂条件开发了一种实验工具和方法。一个专门设计和制造的安装在拖拉机三点悬挂装置上的测试仪器被用作测量设备。测量装置的耐磨钢部件也是测量电导率的传感器。本文描述了测量系列的条件、测量结果以及我们对土壤传感器实验得出的结论。在不同浓度的钾和钙溶液湿润的土壤中测量了不同特性。电导率值随盐浓度增加呈上升趋势，我们还发现不同溶液比例下电导率的变化速率不同。基于我们的测量，我们发现隔离浓度差异的最佳方法是使用20赫兹至250千赫兹的测试频率范围。
