Abstract
Volumetric water content measurements based on soil dielectric properties are affected by soil compaction. Today’s commercial products produce substantial measurement error as they do not account for the influence of soil compaction. This paper presents a portable soil volumetric moisture content sensor based on the principle of standing wave rate and simultaneous soil compactness measurement. The coupling relationship between soil compactness and soil volumetric moisture content can be easily observed by converting them into polar coordinates. A modified soil volumetric moisture content model based on the soil compactness is also established to support the operation of the proposed sensor.
Highlights
Soil moisture content is an important physical factor affecting plant growth and crop yield, and is of crucial significance to agricultural and forestry production professionals [1,2]
Changes in soil volumetric moisture content for different compactness The changes in soil volumetric moisture content corresponding to different compactness (CI) for the three types of soil samples are shown in figure 4
We found that the change rate of soil volumetric moisture content caused by soil compaction differs under different soil moisture degrees
Summary
Soil moisture content is an important physical factor affecting plant growth and crop yield, and is of crucial significance to agricultural and forestry production professionals [1,2]. The changes in soil water content form an important basis for evaluating plant health and guiding irrigation. Soil volumetric water content is typically measured by drying methods, dielectric methods, or neutron meter methods [3,4,5,6,7]; drying methods are most common among them as they are convenient, accurate, and operated [8,9,10]. Dielectric methods, have become increasingly popular as they facilitate rapid, efficient, and continuous measurement of soil volume moisture on either portable or fixed equipment [11,12,13]. The effects of soil compaction on the measured data are rarely considered in plant health assessment or irrigation guidance applications [14,15,16,17,18]. An important factor affecting soil volumetric water content, is meaningful only when comparing soil volumetric water content measurements under a unified compactness level
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