Abstract
Using the air infiltration characteristics of a porous cup we developed a prototype measuring device that determines the degree of dryness of the soil (simple soil moisture measuring system). This simple soil moisture measuring system consists of a porous cup, a transparent polyvinyl-chloride pipe, and a silicon stopper. When the soil is drier than the air entry value of the porous cup, air enters into the polyvinyl-chloride pipe, which was made airtight by filling up water, via the porous cup. This air is pulled back through the negative pressure inside the polyvinyl-chloride pipe, and the water level inside the polyvinyl-chloride pipe drops. The drier the soil the more the water level inside the polyvinyl-chloride pipe drops. The simple soil moisture measuring system determines the degree of the dryness of the soil by using the drop of the water level inside the polyvinyl-chloride pipe as a marker.
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