DETERMINATION OF SOIL TROPHIСITY BY ELECTROPHYSICAL METHOD. MESSAGE 3. ADJUSTMENT OF HUMIDITY INFLUENCE

The aim of this work was to develop a way to adjust the effect of soil humidity on the determination of specific electrical resistance (SER). This goal is achieved by the fact that measuring is made using a capacitive sensor of volumetric soil humidity simultaneously with the measurement of SER using a 4-electrode F.F. Wenner array. Based on the analysis of literary and own data equations for adjusting SER against the background of different volumetric humidity and soil porosity are proposed. Further refinement of SER measurement results can be achieved by including in the equation the parameters related to the cation-exchange capacity (CAC) of the soil, namely the content of organic matter and clay particles. It is suggested that it is possible to determine expressly the latter using color-gauge (RGB) sensors.