New Soil Tension Meter and Soil Water Potential Measuring Method

Abstract

The invention discloses a new type of soil tensiometer, which includes a main body of the tensiometer, a clay head, a water inlet pipe, a water outlet / exhaust pipe, and a pressure sensor. The clay head is in direct contact with the soil and has a U-shaped cavity pipe inside; the water inlet pipe and the water outlet / exhaust pipe are connected to one end of the U-shaped cavity pipe; the water outlet / exhaust pipe is equipped with a one-way valve, and the one-way valve is set Between the pressure sensor and the U-shaped cavity pipe; there is a first sealing device on the water inlet pipe, and a second sealing device on the water outlet / exhaust pipe; the pressure sensor is used to measure the first sealing device to the one-way valve and the one-way valve. A soil water potential measurement method is also disclosed to measure the pressure difference between the valve and the second sealing device. The design of the U-shaped cavity pipe of the present invention facilitates the complete exhaustion of internal gas; the design of the U-shaped cavity pipe leaves ample space for the pressure sensor and sensor circuit; the initial pressure difference is automatically calibrated to avoid atmospheric pressure fluctuations from affecting the measurement results. Impact: The device is small in size and easy to install and maintain.

Description

technical field [0001] The invention relates to a novel soil tensiometer and a method for measuring soil water potential, and belongs to the technical field of soil property measuring tools. Background technique [0002] Soil moisture is an important indicator for studying soil moisture movement and crop drought characterization, and is an important parameter for farmland irrigation management, research on regional hydrological conditions, and calculation of water balance in watersheds. With the increasingly prominent water crisis, the research on water-saving agriculture has been given great attention at home and abroad, and soil water has become a routine measurement item in the research of agricultural resources and environment. In addition to soil water content, soil water potential can directly reflect the hydrodynamic characteristics of soil and the water supply capacity of soil to plants, so it is also widely used in hydrological research and agricultural production. ...

AI Technical Summary

Problems solved by technology

The problem with this method is: 1) the gas in the tensiometer tube is not easy to exhaust when unplugging and adding water, and the operation is relatively complicated, requiring certain experience; 2) the water-containing tube body is exposed to the ground, and it is easy to freeze and crack in winter, resulting in damage to the device; 3 ) The pipes and pressure gauges on the surface are easily damaged by manual and mechanical work in the field, which limits work efficiency

Chinese patent CN105486838A discloses a tensiometer and test method that is convenient for maintenance and anti-freezing to measure soil water potential. The tensiometer is improved to solve the problem that the tensiometer is not exhausted, and the pipe body exposed to the surface is prone to artificial or low-temperature freezing. However, the design still has the following outstanding problems: 1) The tensiometer tube is long and inconvenient to install; 2) Since the pressure sensor is installed on the top of the tube body, the tensiometer tube diameter is relatively thick; 3) Electronic equipment integration low degree

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