Methods of soil moisture expression and detection
The meaning of soil moisture
Soil moisture is a physical quantity that represents the degree of soil dryness and moisture in a certain depth of soil, and it is also called soil moisture content. The level of soil moisture is restricted by the various components of farmland moisture balance. The soil moisture sensor system is one of the best ways to detect soil moisture.
Soil moisture sensor system
The soil moisture sensor system is composed of a stainless steel probe and a waterproof probe. It can be buried in the soil and dams for a long time to conduct fixed-point monitoring. And online measurement of the surface and deep soil moisture. Used in conjunction with a data collector, it can be used as a tool for fixed-point water monitoring or mobile measurement to measure soil volumetric water content. It is mainly used for soil moisture detection, agricultural irrigation and forestry protection.
Soil moisture expression method
Soil moisture, that is, the actual soil moisture content, can be expressed as the percentage of soil moisture content in the dry soil weight. Soil moisture content = moisture weight / dry soil weight × 100%. It can also be equivalent to the percentage of soil water content and field water holding capacity. Or relative water content such as the percentage of saturated water content. According to the relative humidity of the soil, we can know the degree of soil moisture and how much water can be retained, which has reference value in irrigation. Soil moisture affects the field climate, soil aeration and nutrient decomposition. And is one of the important conditions for soil microbial activity and crop growth and development.
Soil moisture is affected by conditions such as the atmosphere, soil quality, and vegetation. In the field, the soil moisture is usually judged by hand, and it is generally divided into four levels: (1) wet, water can flow out of the soil when squeezed by hand; (2) wet, leaving wet marks on the hand to rub It becomes a soil ball or strip, but no water flows out; (3) Moist, it feels cool when placed on the hand, leaving a slight mark when pressed by hand; (4) Dry, there is no cooling sensation on the hand, and the clay becomes a hard lump.