Abstract
It presents a new structure of soil moisture probe which is designed for the solar automatic water-saving irrigation. DC two-probe method is used to measure resistivity of the new probe with different content of graphite under wet and dry conditions. The results show the resistance variation of the composite material with more than 25% graphite content is very small, its suitable for the production of two-pin probe; the conduction of composite material with less than 15% graphite content are greatly affected by the cement, its suited for the production of one-pin probe. The research results can be used as reference for choosing moisture probe according to different soil.
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