. Effects of air gaps and saturated voids on accuracy of neutron moisture measurements. Soil moisture Measurement. sand was +36 percent moisture by volume. Then, figure 14 is entered at 36 percent and foUowed vertically to the error curve for the coarse material. Move horizontally from this intersection to the negative error curve for the coarse material; from this point, the estimated maximum negative error of percent mois- ture by volume can be found on the abscissa. Also, by continuing left horizontally from the negative error curve to the ordinate, the esti- mated volume of cubi
. Effects of air gaps and saturated voids on accuracy of neutron moisture measurements. Soil moisture Measurement. sand was +36 percent moisture by volume. Then, figure 14 is entered at 36 percent and foUowed vertically to the error curve for the coarse material. Move horizontally from this intersection to the negative error curve for the coarse material; from this point, the estimated maximum negative error of percent mois- ture by volume can be found on the abscissa. Also, by continuing left horizontally from the negative error curve to the ordinate, the esti- mated volume of cubic inches for the void can be found. The estimated maximum negative error is of interest because this value may be difficult, if not impossible, to measure in the field when the void is empty. It should be kept in mind that figure 14 was derived from laboratory data obtained from symmet- rical voids. It is not known whether figure 14 will provide accurate estimates of the volume of an asymmetric JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC DATE Figure 12. — Seasonal soil moisture for a given Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Richardson, Bland Z. cn; Burroughs, Edward R. (Edward Robbins), 1930-; Intermountain Forest and Range Experiment Station (Ogden, Utah) 1n. Ogden, Utah : Intermountain Forest & Range Experiment Station, Forest Service, U. S. Dept. of Agriculture
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