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Application of Soil Moisture Sensor in Agricultural Land Irrigation
Agricultural irrigation mainly refers to irrigation operations in farming agricultural areas. Agricultural irrigation can be divided into traditional surface irrigation, ordinary sprinkler irrigation and micro irrigation. Traditional surface water irrigation includes side irrigation, furrow irrigation, submerged irrigation and flood irrigation. However, this type of irrigation is often an unreasonable agricultural irrigation due to its large water consumption and low water consumption. In addition, ordinary sprinkler irrigation technology is a relatively common irrigation method in my country's agricultural production. However, the water efficiency of ordinary sprinkler irrigation technology is not high. Modern agricultural micro-irrigation technologies include micro-sprinkler irrigation, drip irrigation, and infiltration irrigation. Compared with traditional irrigation methods, these irrigation technologies generally have better water-saving effects and higher water use efficiency. Whether it is traditional irrigation, ordinary irrigation or micro-irrigation, we cannot judge with the naked eye whether the humidity of the land reaches the optimal humidity required by crops. At this time, we need a soil moisture sensor to help us monitor the moisture of the soil to ensure that the soil reaches the optimal moisture for plant growth after irrigation. Soil moisture sensor is a sensor that monitors soil moisture. It can also be called: soil moisture sensor, soil moisture sensor, and soil moisture sensor. It is mainly used to measure the volumetric water content of soil and is used in soil moisture monitoring and agricultural irrigation and forestry protection. The probe of the sensor is buried to the depth where humidity monitoring is needed to monitor the humidity of the soil. By measuring the dielectric constant of the soil, the volume percentage of the soil moisture is measured and uploaded to the monitoring platform in real time. If the humidity is too high, the irrigation will be stopped; if the humidity is too low, the electromagnetism connected to the water source can be controlled by photoelectric isolation and a relay. The valve continues to irrigate. The monitoring platform also has an alarm function, which can set the upper and lower limits of humidity. When the humidity is too high or too low, you can notify everyone in time through platform interface alarms, SMS alarms, sound and light alarms, etc. In addition to real-time monitoring of the operating conditions of the system, the platform can also record and analyze historical data, as well as download and print data, which is convenient for scientific research. The commonly used soil moisture sensors are FDR type and TDR type, namely frequency domain type and time domain type. The TDR method is a soil moisture measurement method developed in the 1980s. The Chinese name is Time Domain Reflectometer. This method is widely used in foreign countries, and it has just begun to be introduced in China, and all departments have paid great attention to it. TDR is a system similar to a radar system, with strong independence, and its results are basically independent of soil type, density, and temperature. And it is also very important that TDR can measure soil moisture under icy conditions, which is unmatched by other methods. In addition, TDR can monitor the soil water and salt content at the same time, and there is almost no difference between the results of the two measurements. The degree of this measurement method is evident. Because the TDR method equipment is expensive, in the late 1980s, many companies (such as AquaSPY, Sentek.Delta-T, Decagon) began to use a simpler method than TDR to measure the dielectric constant of the soil-FDR type ( Frequency domain type), which uses the principle of electromagnetic pulse to measure the apparent permittivity (ε) of the soil according to the propagation frequency of electromagnetic waves in the medium to obtain the soil volumetric water content (θv). FDR is not only cheaper than TDR, but also measured The time is shorter, after a specific soil calibration, the measurement accuracy is high, and the shape of the probe is not limited, and it can be measured at multiple depths at the same time, making data acquisition easier. FDR has the advantages of simple and safe, fast and accurate, fixed-point continuous, automation, wide range, less calibration, etc. It is a recommended soil moisture measuring instrument. The soil moisture sensor uses the FDR method to measure soil moisture. By measuring the dielectric constant of the soil, the volume percentage of the soil moisture is measured. The soil moisture measurement method that meets the current international standards can directly and stably reflect the The true moisture content of the soil. It is suitable for soil moisture monitoring, scientific experiments, water-saving irrigation, greenhouses, grassland pastures, soil rapid measurement, plant cultivation, greenhouse control, precision agriculture, etc., as well as measurement of water conservancy, meteorology and various particulate water content. Technical parameters (analog output type):Power supply: 12~30V DCMaximum power consumption: 60mA*24V DCMoisture measurement range: 0~100%< /p>Moisture accuracy: ±3% in the range of 0-53%; ±5% in the range of 53-100%Storage environment: -40℃~80℃Response time: <1s< /p>Output signal: 4~20mA, linear outputSoil moisture measurement area: centered on the central probe, inside a cylinder with a radius of 7cmprobe length: 70mmprobe diameter ：3mmProbe material: 304 stainless steelSeal material: epoxy resin (black flame retardant)Cable length: standard two metersProtection level: IP68
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