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AN ESTIMATE OF THE POTENTIAL OF THE ELECTROMAGNETIC METHOD FOR APPLICATION IN SOIL MOISTURE MEASUREMENT

Based on the theory of interaction between electromagnetic waves and matter and using the data of inter-layer and spatial variation of the physico-chemical properties of several typical soils in Northwest China, the effects of variations in soil physico-chemical properties of the soil on soil dielectric constant (e s), complex refractive index (n) and mass absorption coefficient (u) were analyzed and the influence of soil bulk density and texture on electromagnetic measurement was investigated. It is concluded that e s is highly sensitive to soil moisture and less sensitive to other physico-chemical properties of the soil and, therefore, the dielectric method is more adaptable and more precise for soil moisture measurement than any other methods.