Soil sensor is a general term for monitoring soil moisture. Can be divided into: soil moisture sensor, soil moisture meter, soil moisture meter, soil moisture meter, soil water sensors, soil temperature sensor, soil salinity sensor. Soil water content has two expression methods: weight water content and volume water content (volume water content). The weight water content is measured by the soil drying method. The water content measured by the soil moisture sensor is volumetric water content. That is, the soil water sensors is an instrument that measures the proportion of moisture per unit of total soil volume. Some soil moisture sensors can simultaneously measure the three parameters of soil moisture content, soil temperature and total salt content in the soil.
The soil moisture sensor uses the FDR frequency domain reflection principle. FDR (Frequency Domain Reflectometry) is an instrument used to measure soil moisture. It uses the principle of electromagnetic pulse to measure the apparent dielectric constant of the soil according to the frequency of electromagnetic waves propagating in the medium. , So as to obtain the relative water content of the soil, FDR has the advantages of simple and safe, fast and accurate, continuous fixed point, automation, wide range, less calibration and so on. It is a recommended soil moisture measuring instrument.
Sensors that detect soil conditions have become an important tool for modern farmers in crop production. There have been more gratifying developments in this area.
The benefits of soil sensors are obvious, due to the difference in resistance or conductivity. Can clearly reflect the information of soil moisture and soil particle composition. It also draws intuitive conclusions on density, pH, accumulation of nutrients, and temperature. Through the network construction in the farm. The real-time parameters collected by the soil sensor are transmitted to the host computer. Cooperate with the system installed on the machine to realize the automatic control spraying of chemical fertilizers and pesticides. Experts generally believe that. Soil sensor systems will become a major boost to modern agriculture in the foreseeable future.
“Technically speaking, this may also be solved by methods such as telemetry. However, satellites, unmanned helicopters, etc. require higher costs and are difficult to monitor at any time. More importantly, the soil sensors are buried in the ground and are located in the ground. It is in a static state and is relatively stable. It can meet higher data transmission requirements. These advantages are not available in telemetry.” said Robin Gibbs, Ph.D., Institute of Agricultural Engineering, Leibniz University, Germany.