| http://www.w3.org/ns/prov#value | - A sensor adapted to be embedded in a plot of soil to track the moisture content of said soil, comprising:a) a radiation source; b) a radiation receiver; and c) a transparent body forming a radiation path from said source to said receiver; d) said body including at least one surface disposed in said path and arranged to reflect toward said receiver a quantity of radiation which varies over time sub
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