The commonly used methods of access tube installation and neutron depth probe calibration were impractical in the stony soils of an agricultural watershed in eastern Pennsylvania. Modification of a portable power-driven drilling machine made it possible to drill straight boreholes to a depth of 24 feet through the soil and the underlying shale beds. Backfilling oversize holes around the access tubes with fine soil material gave satisfactory results. Reasonable correspondence was found between calibration curves from heterogeneous, stony sites and more precise data obtained at a site with alluvial, stone-free soil derived from the stony residual soils upstream. The field calibration curves were Publ. ARS 41-37, 1964. Reinhart, K. G., The problem of stones in soilmoisture measurement, Soil Sci. Soc. Am. Proc., 25, 268-270, 1961. Richardson, B. Z., Installation of soil moisture access tubes in rocky soils, J. Soil Water Conserv., 21, 143-145, 1966. Stone, J. F., D. Kirkham, and A. A. Read, Soil moisture determination by a portable neutron scattering moisture meter, Soil Sci. Soc. Am. Proc., 19, 419-423, 1955. Van Bavel, C. H. M., P. R. Nixon, and V. L. Hauser, Soil moisture measurement with the neutron method, U.S. Dept. Agr. Publ. ARS