Soil water refers to the water contained in the soil gap or adsorbed in the soil. Soil water is the material basis for plant growth and survival. It not only affects the yield of forest trees, field crops, vegetables and fruit trees, but also affects the distribution of plants on land surface. The change of soil water has a very close relationship with the growth of crops. The change of soil moisture is caused by the movement of soil water. Most of the water absorbed by the crop comes from the water in the soil, in addition to the water in the air. Water is the most important material for crop growth, which is related to the growth rate of crops and the harvest. Therefore, rapid and accurate determination of soil moisture is of positive significance for improving farmland operations. At this time, the soil moisture meter has played a role in fueling the waves.
However, from the standpoint of plant growth, the effective moisture of the soil is very important, and the effective moisture refers to the water content of the soil. More than the permanent withering point, that is, the water absorbed by the plant is the soil moisture content of the permanent withering point and the volume of the field. There are many experiments to prove that if the soil water content is lower than the permanent withering point, it is not suitable for the growth of the crop. The water content in the water is properly irrigated so that the amount of irrigation can be controlled and the water resources can be used rationally. At this time, you can use the soil moisture recorder to operate. It can record the five parameters of soil temperature, soil moisture, atmospheric temperature, atmospheric humidity and dew point in real time, providing a scientific basis for differentiated water-saving irrigation, and precise water supply is also conducive to improving crop yield and quality. The soil water content is lower than this value, the crop is difficult to absorb water, and the growth is blocked. This indicator can be regarded as a turning point in the difficulty of water absorption of crops. Its value is about 60-70% of the field water holding capacity, which can be used as the lower limit of suitable humidity for crops, or as an indicator of irrigation. When soil water is continuously consumed due to plant root water absorption and topsoil evaporation, soil water content is continuously reduced, soil water suction is increasing, and crop root water absorption is becoming more and more difficult. When the leaf surface evaporation is greater than the water absorption of the root system, the leaves of the crop will shrink and sag, showing wilting. When the water content of the soil is below a certain value, it wins when it is properly irrigated. In the process of irrigation, if the amount of water is too much, the soil will be ventilated due to excessive water, resulting in a decrease in water demand and alkalization of the soil. If the water is too small, the cell moisture absorption is too slow, and it is generally not suitable to keep the cell swelling and wither. So when irrigating, the water is not as much as possible.
How to control the timing of soil irrigation and the amount of water weaving, we need to rely on relevant instruments, such as soil moisture meter. In addition, the soil moisture meter can be replaced by a soil moisture temperature meter. The soil moisture temperature meter can not only determine soil moisture, but also determine soil temperature. Because soil moisture and soil temperature are two interacting factors, we should also determine soil temperature while studying soil moisture factors. In addition, if we need to measure soil moisture at different depths, we can also use the fixed-point moisture monitoring system to make measurements. Because the fixed-point public opinion monitoring system can realize the vertical six-point method synchronous detection, it is possible to measure soil moisture at different depths, which is more suitable for spatial differentiation comparison.
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