The automatic soil moisture monitoring stations in each area measure soil moisture or soil moisture through soil moisture monitoring systems. The soil moisture monitoring system is set to measure the time interval and then buried in the measured point. When the instrument starts to run, it will sample and measure at regular fixed-point according to the set requirements. Soil moisture monitoring system, also called soil moisture recorder, is an instrument that is specialized in determining soil moisture content. If it is necessary to measure soil moisture based on the determination of soil moisture, the soil moisture temperature analyzer can be used.
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We sampled 0~5cm, 5~10cm, 10~20cm, 20~30cm, 30~40cm, 40~50cm, and 90~100cm depth soils, and analyzed the soil moisture content and relative humidity at each level. Comparing observation data with soil moisture monitoring system for automatic monitoring of soil moisture data for comparative analysis. The automatic monitoring data is obviously low and shows obvious systematic errors. In the latter stage, the automatic monitoring data of the three levels of 20~30cm, 30~40cm, and 40~50cm showed a small change, while the artificial contrast observation data had a larger change. If the statistical average deviation is calculated, the average soil level from small to large is: 90~100cm, 5~10cm, 0~5cm, 10~20cm, 20~30cm, 30~40cm, 40~50cm. From the data analysis, it can be seen that the automatic monitoring data of 90~100cm, 0~5cm, 5~10cm, and 10~20cm are more accurate, while the accuracy of automatic monitoring data of 20~30cm, 30~40cm, and 40~50cm is poor.
The causes of systematic errors in the soil moisture monitoring system are as follows: 1. The soil moisture monitoring system has more rock masses and soil in the soil layers around the site of the soil moisture monitoring system. Soil moisture content is directly monitored. There are more stones and less soil. The volume of soil moisture is naturally low, and the relative humidity of the soil is also low. 2. The soil moisture monitoring system itself is damaged, or the system is old, and the sensitivity to soil moisture is not high. In this case, consider replacing the soil moisture monitoring system. 3. The soil moisture monitoring system itself will have systematic errors, and it will also cause deviations from the artificial contrast observation data. As long as the deviation is in the appropriate range, we can obtain the final soil moisture content through corresponding corrections. At this point, it can be considered that the data measured by the soil moisture monitoring system is accurate.
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