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At present, the main methods for determining soil water potential are tensiometer method, centrifuge method, pressure membrane method, etc. The soil water potential meter is an instrument that has just emerged in recent years. What are the differences in results for different tests on the same soil? What criteria are used to evaluate the accuracy of different test methods in their measurement range? Why does the same soil determine the suction value and centrifuge, tension in the same membrane under the same humidity? The measured suction value has a large difference.
In the three most common test methods for measuring soil water potential, the measurement accuracy of the pressure membrane meter is high, and the shape of the soil moisture characteristic curve measured by the pressure membrane meter is roughly in line with the characteristic curve of the soil, and can be used to quantify the dynamic changes of soil moisture. process. However, it takes up to six months to completely measure the water characteristic curve of a soil (for example, soil). Of course, if only the relative shape of the characteristic curve is measured, the measurement period can be greatly shortened, but it is necessary to find the proportional relationship between the relative shape curve and the standard characteristic curve. The soil water potential meter can solve these problems well and the results given are accurate and credible.
The soil water potential measured by the soil water potential meter is very accurate
Soil water suction is a measure of the strength of soil moisture and the direction of soil water movement. It is closely related to the effectiveness of plant water absorption. Soil water suction is closely related to soil water mobility and plant availability. Soil moisture content is an indicator of soil water volume. There is a certain relationship between soil water potential and soil water content. In general, soil water potential is higher and water content is higher; soil water potential is lower and water content is lower, so negative pressure Soil tensiometer readings can generally reflect soil moisture status. Soil water potential meter is also an important instrument for the determination of soil water potential, and its measured results are very accurate and reliable.