Why rate? The default accuracy of the soil moisture sensor is the accuracy after the Anhui loam rate is determined (3%), if the accuracy of measuring other soils is required to be within 3%, it is necessary to determine the individual rate for this soil. The soil moisture content referred to by the general soil moisture sensor actually refers to the amount of water expelled from the soil at a temperature of 105°C-110°C per unit mass or volume of soil. The soil moisture sensor is timed by drying method to determine the soil quality and water content, and the rate timing can be carried out by referring to the following methods: Soil moisture sensor soil volume moisture content method: This method is suitable for the determination of the same soil during the measurement process, and the bulk density does not change much. The soil moisture sensor operates as follows: 1Prepare soil samples with different water content for soil moisture sensors (or select points for different water content levels in the measured area). 2. Use the computer or RTU to connect the soil moisture sensor to measure the measured soil sample, record the corresponding digital output value, and at the same time take the original soil sample with a ring knife, transfer it to the aluminum box, send it to the laboratory to dry at 105 °C for 24 hours, and calculate the soil volume water content. Finally, soil moisture sensors collect data processing. The soil volume water content (cm3cm-3) of different water content levels (generally more than 4 points) of the measured soil was determined by drying method, which was recorded as x1, x2, x3, x4, x5, etc., and the corresponding digital values measured by the soil moisture sensor were recorded as v1, v2, v3, v4, v5, etc., and the unary cubic equation was regressed on the above data, and the above data were corrected.

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