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Volumetric Calibration of Neutron Moisture Probes¹

ABSTRACT

A volumetric method of estimating the slope (b coefficient) of a neutron moisture probe calibration curve is discussed. Coefficients obtained for three probes by this method did not differ significantly between soil series or between horizons within a series. Simply dividing the count rate in water by 100 gave a value virtually identical to the b coefficient determined volumetrically for these probes and soils. Agreement was excellent between measured outflow and outflow predicted from neutron measurements made with a volumetrically calibrated moisture probe.

¹ Contribution from the Coweeta Hydrologic Laboratory, SE Forest Exp. Sta., Forest Service, USDA, Asheville, North Carolina. Presented before Div. S-1, Soil Science Society of America, Columbus, Ohio, Nov. 1, 1965.

² Soil Scientist, Forest Service, USDA, Asheville, N. C.

Received for publication November 22, 1965. Accepted for publication May 13, 1966.