Description
Soil moisture sensors measure the volumetric water content in soil. Since the
direct gravimetric measurement of free soil moisture requires removing, drying,
and weighting of a sample, soil moisture sensors measure the volumetric water
content indirectly by using some other property of the soil, such as electrical
resistance, dielectric constant, or interaction with neutrons, as a proxy for the
moisture content. The relation between the measured property and soil moisture
must be calibrated and may vary depending on environmental factors such as soil
type, temperature, or electric conductivity….
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