Seed and Berry LLP
Device and method for determining properties of a soil
 A measuring instrument for measuring the matrix potential in a soil, has a measuring cell with a housing that includes at least in certain sections thereof, material permitting the moisture of the soil to penetrate into the interior of the housing, at least two electrodes which are arranged in said housing in spaced relationship with each other and a dielectric which fills the space between said electrodes and the inner wall of the housing, a measurement evaluation circuit which detects the water content in the dielectric of the measuring cell by measurement of changes of permittivity of the dielectric and determines, on the basis of said water content and on the basis of a known relationship between the water content and the matrix potential of the dielectric used, the matrix potential prevailing in the dielectric, and which displays said matrix potential as a measuring result. 
G G
G01N G01N
inventional inventional
Jin-Chen
Liu