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In the field of FDR soil moisture detection methods, studies have considered more soil temperature, but less consideration of the impact of bulk density on the measurement results. For soils with the same moisture content but different densities, the measurement results may be different, which affects the accuracy of the sensor measurement. When researching at home and abroad, the influence of density is reduced by selecting the appropriate frequency. Although this method can reduce the impact of density, the effect still exists. In order to investigate the combined effects of temperature and bulk density on FDR measurement results, this paper takes the soil of Guanzhong area as the object, and takes soil with a moisture content of 3.82%-21.43% as a sample to study the temperature (2.5w500C) and the bulk density. (0.9-}-1.3g/cm3) The influence of the output signal of the FDR sensor was established, and a temperature and humidity measurement model was established to provide a technical basis for the development of a soil moisture detector with a temperature and bulk density compensation function.
In order to predict the water content of the soil based on the output current value under the conditions of known sample temperature and bulk density, the moisture content was measured at 3.82%^21.43% at 2.50C^-500C and the bulk density was 0.9--1.3g. The output currents of 54 samples at /cm3 were calculated using the Newton iteration method and Matlab 2010b software (The Mathworks Corporation, USA, based on equation (C4), calculated the program for the moisture content based on output current, temperature, and bulk density, and calculated 54 samples. The moisture content of the portable soil moisture temperature measuring instrument can be easily and quickly concluded in these determinations.
By measuring the soil temperature and humidity with a portable soil moisture temperature quickness meter, and analyzing and summarizing it, we can find that the soil temperature and the bulk density have a significant effect on the moisture content of the FDR moisture sensor. The higher the soil temperature and bulk density, the greater the FDR's moisture content test results. The relationship between FDR sensor output current and actual soil water content, temperature, and bulk density can be expressed by the ternary quadratic equation. The coefficient of determination of this model is 0.9302. The verification results show that the established model can predict the actual water content of soil based on output current, temperature and bulk density. The absolute error between predicted moisture content and actual moisture content is -2.64%^-2.81%.
Analysis of Soil Humidity Bulk Density and Other Related Factors by Portable Soil Moisture Temperature Tester
The most important carrier for the growth of terrestrial plants is none other than soil. The soil is a mixture of substances. Its constituent substances are mainly minerals, organic matter, water, and air. The structure is composed of irregularly arranged and intricately dispersed solids. The particles form a skeleton, while the pores between the particles are filled with constantly moving water and air. One of the restrictive factors that affect the growth of crops is definitely soil moisture, which is the guarantee for the survival of plants. It is very important to grasp the temperature of soil moisture in the process of crop cultivation. Generally, it can be measured by a portable soil moisture temperature speedometer.