In agricultural irrigation, actually using soil water potential to control irrigation is more scientific and more reasonable than using soil moisture to control irrigation. This is because water content does not directly reflect the degree of drought in soil, and the only indicator to determine the degree of drought in soil is Soil water potential. In addition, unlike the soil water content, the soil water potential is an absolute physical quantity. The physical meaning of the same water potential value in different soils is exactly the same. The water potential values ​​from different soils can be directly compared with each other. At present, the instrument for measuring soil water potential is mainly a soil water potential meter. Therefore, with the proposed cost-effectiveness of agriculture, using a soil water potential meter to measure soil water potential has become a key technology for achieving agricultural water-saving irrigation. Since people recognized the importance of soil water potential measurement, long-term search for an accurate and rapid soil water potential measurement method has become the goal of scientists and engineers in different disciplines. At the same time, it has also tried to create instruments for measuring soil water potential. Today's soil water potential meter, an instrument that uses sensors to determine the water potential of a soil, began to truly recognize it and began to guide the new trend in measuring soil water potential.
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From the development history of the soil water potential meter, it is not easy for him to perform portable measurement and automatic data transmission. It is necessary to know that in the past, we used the resistance plaster block to the wet and dry ball meter and the subsequent water injection. Tensiometers, etc. Although these methods can obtain soil water potential data, they often have certain limitations. For example, many of these methods are suitable for use in certain areas and are difficult to maintain and are not suitable for long-term monitoring in the field. These are all problems. It is inconsistent with the actual requirements for soil water potential measurement in modern agriculture. Therefore, after the efforts of professionals, the final soil water potential meter appeared in front of us.
