Changes in soil moisture content are affected by many factors, including not only their own structure, but also often affected by the external environment such as the atmosphere, temperature, light, or their mutual influence. However, soil moisture changes are often related to agriculture. The production results are inseparable. Therefore, the use of soil moisture recorders to monitor soil moisture content is crucial for the development of modern agriculture. In the year, according to the change of seasons, the change of soil moisture can also be divided into four stages. The following four stages of the change of soil moisture in one year are summarized through monitoring data of soil moisture recorder.

1. The first stage is the relatively stable period of soil moisture content, which is generally the four months of 11,12 and 1,2. This period is due to low precipitation, low temperature, and evaporation is the lowest in the whole year, so this period Soil moisture during the period is relatively stable. However, according to the monitoring results of the soil moisture recorder, we found that at the beginning of this period, because the rainy season had just passed, the soil moisture content was high and the soil water consumption was very large. Spring use.
2. The second stage is the slow consumption period of soil moisture, mainly in the period from early March to late April. As the temperature gradually rises during this period, the evaporation increases, while the precipitation does not increase significantly, so the loss of soil moisture is more Increased before. In addition, after the soil thawing at the beginning of this period, the water content of the surface layer was higher, the capillary water was active, and the soil moisture was easily evaporated. The evaporation should be prevented in time.
3. The third stage is the large loss period of soil moisture. This period is also a key period for monitoring the soil moisture recorder. Pay attention to promptly make up for changes according to soil moisture. The temperature during this period was relatively high, and the surface evaporation was the highest in the whole year. Although the precipitation also increased, the actual results monitored by the soil moisture recorder showed that the water consumption was greater than the precipitation. Therefore, soil moisture should be used during this period. The recorder will strengthen soil moisture monitoring and timely replenish evaporated soil moisture to ensure crop water demand.
4. The fourth stage is the recovery period of soil moisture, the temperature is lower than before, the water surface evaporation is also reduced, the precipitation is relatively stable, and it is dominant compared with the water consumption, so the soil moisture condition is recovered during this period.
Of course, these four periods are aimed at areas where most meteorological changes are relatively stable. To minimize the impact of climate impacts, it is necessary to use soil moisture recorders to quickly and accurately monitor soil moisture.

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