Comparison of the measurement methods of soil water content by error analysis
1988
Eom, K.C. | Ryu, K.S. | Um, K.T. (Rural Development Administration, Suwon (Korea R.). Agricultural Sciences Institute)
A series of field experiments was conducted to find out error range and to compare precision based on error analysis of soil water content measured with gravimetric, surface and depth neutron and gypsum block methods in a sandy loam soil. The error of soil water content measured with gravimetric (core-sampling), surface and depth neutron method showed quadratic curve, whereas that with gypsum block was exponential curve in relation to soil water content. Within the range of volumetric soil water content from 11 to 33%, the error of soil water content measured with gravimetric, surface neutron, depth neutron and gypsum block method ranged from 0.28 to 3.49%, 0.71 to 2.63%, 0.52% to 1.01% and 0.05 to 21.89%, respectively. The error of soil water content measured with depth neutron method was lower than those of other methods, when the soil water content was more than 14% in sandy loam soil. The relative number of replicates of soil water measurement for surface neutron, depth neutron and gypsum block method to attain same precision for gravimetric method was 0.6-1.7, 0.07-0.8 and 0.1-1.25, respectively
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