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In fact, the method of measuring soil water potential is not only a soil water potential meter. Others include a pressure membrane, a centrifuge, and a tensiometer. The core of the soil water potential meter is a tensiometer. In fact, the soil water potential analyzer is not dominant in accuracy. Among these three methods, the accuracy of the pressure membrane is the highest, followed by the accuracy of the centrifuge and the tensiometer, but even so, the soil water potential meter remains It is an instrument that is currently available for agricultural production and laboratory measurements of soil water potential, mainly because of its advantages in other aspects.
Although the accuracy of the pressure membrane is high, the measurement period is long. For example, the shape of the soil water characteristic curve measured by the pressure membrane is roughly in line with the characteristic curve of the original soil, but it takes as long as half a year to completely measure the characteristic curve of a soil. One point is very difficult to meet the needs of current soil research work. Secondly, the soil moisture characteristic curve measured by the centrifuge is deviated from that measured by the pressure membrane. The measurement results are different due to the constant change of the soil bulk density and the soil temperature during the determination of the centrifuge, but its measurement period is short. Although the soil water potential meter based on the tensiometer has a relatively large error, if the pressure sensor is used to maintain the balance, the moisture exchange between the soil and the tensiometer is neglected and the accuracy will be significantly improved. Therefore, the soil water potential meter is more in line with the requirements of modern agriculture. Therefore, based on this, the soil water potential meter is the instrument of choice for measuring soil water potential in agriculture and is widely used to determine the period of farmland irrigation.
What are the advantages of soil water potential meter for measuring soil water potential?
Nowadays soil research is no longer just focusing on the soil itself. Instead, soil, plants, and the atmosphere are used as a continuous system, and their capabilities are considered in a unified manner. Therefore, the application of measuring instruments such as soil water potential analyzers is now conducting soil moisture studies. The inevitable trend is also an effective way to ease the work intensity of researchers.