Construction of Field Measurement Model for Real-time Monitoring System of Soil Water Content

April 18, 2023

Due to the increase of many factors affecting the weakening and enhancement of soil moisture, the change of soil moisture is very complicated. Common methods are used for research. Although some theories are relatively mature, it is difficult to be really applied, such as soil hydrodynamic methods and soil water balance methods. The former is difficult to apply because the actual soil composition is complex, and the latter is more difficult to apply due to observation items. Although some items such as the empirical formula method are not many, it is not easy to establish a new empirical formula. The series cannot be too short. However, with the development of science and technology, the real-time soil moisture monitoring system has been widely used in the accuracy and ability to meet the requirements of regional soil moisture prediction methods.

In the absence of rainfall, soil water content measured by the real-time soil moisture monitoring system suddenly increased and there was a violation of the convention. This was due to the fact that the wheat was in the period of turning green - jointing, and the irrigation area had to carry out spring irrigation for wheat during this period. In the absence of rainfall, according to the law of soil water regression, actual measured values ​​are obviously small, which may be caused by observation errors. In general, the calculated results of the model are in good agreement with the measured values.

In actual soil water retreat, there will be almost no occurrence of regression of moisture in the surface soil to zero but no subsidence in the underlying soil. The reason is simple, the upper and lower layers in the soil are connected, due to the water potential in the soil. The role of soil moisture in the soil with the upper and lower layers of the water potential changes at any time. The real-time monitoring system for soil moisture found that the change is: In general, when the upper soil moisture subsides to a certain extent, the underlying soil moisture will disappear together.

Regional soil moisture is an important factor in many factors of agricultural hydrology. At the same time, the real-time monitoring system of soil moisture is a basic work for farmland water management and regional water resources management. It is a reasonable implementation of irrigation drainage, the increase of crop yields, and water conservation. The analysis of the transformation relationship of four waters and the improvement of the utilization of water resources all play an important role. In recent years, soil moisture content research has become a hot spot in agricultural and water conservancy at home and abroad, and many methods of public opinion forecasting have been proposed. However, the direct monitoring of soil moisture content real-time monitoring system in agricultural products is currently used.

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