"When I add up the live weights, exclusive of roots, estimated by soil biologists, I find more living biomass below the ground than above it, amounting to the equivalent of 12 horses per acre. The soil organisms consume oxygen from the soil air and give off carbon dioxide, and the summation of the multitudes of respirations characterizes the metabolism of a soil individual. Hence I designate soil as a living system."
---(Hans Jenny, "My friend, the Soil", Journal of Soil and Water Conservation, 1984, p. 160)
Hopkins, D. G. 1983. Field Review Rag (humor). Soil Survey Horizons 24(3):39-40.
Hopkins, D. G., J. L. Richardson, and M. D. Sweeney. 1987. Composition Comparisons in Sodic Map Unit Delineations on the Dickinson Experiment Station Ranch Headquarters, North Dakota. Soil Survey Horizons 28(2):46-50.
Hopkins, D. G., and M. D. Sweeney. 1987. Soil survey of the organized irrigation districts of McHenry County, North Dakota. North Dakota Agricultural Experiment Station, Fargo, North Dakota.
Michlovic, M. G., D. G. Hopkins, and J. L. Richardson. 1988. An interdisciplinary procedure for the identification and analysis of archaeological sites in sedimentary contexts. Soil Survey Horizons 29(1):3-9.
Hopkins, D. G., M. D. Sweeney, D. R. Kirby, and J. L. Richardson. 1989. Effects of revegetation on surficial soil salinity in panspot soils. Journal of Range Management 44(3):215-220.
Claypool, D., D. G. Hopkins, and J. L. Richardson. 1990. Soil morphology and stratigraphy on a lower erosional footslope: Dickinson Experiment Station, Western North Dakota. Soil Survey Horizons
Hopkins, D. G., M. D. Sweeney, and J. L. Richardson. 1991. Dispersive erosion and entisol-panspot genesis in sodium-affected landscapes. Soil Science Society of America Journal 55(1):171-177.
Wibawa, W. D., D. L. Dludlu, L. J. Swenson, D. G. Hopkins, and W. C. Dahnke. 1993. Variable fertilizer application based on yield goal and soil map unit. Journal of Production Agriculture
Hopkins, D. G., and J. L. Richardson. 1999. Detecting a salinity plume in an unconfined sandy aquifer and assessing secondary soil salinization using electromagnetic induction techniques. Geohydrology Journal 7(4):380-392.
Hopkins, D. G., and G. L. Running. 2000. Soils, dunes, and prairie vegetation: lessons from the Sandhills of North Dakota. Prairie Forum 25(1):45-64.
Norvell, W. A., J. Wu, D. G. Hopkins, and R. M. Welch. 2000. Association of cadmium in durum wheat grain with soil chloride and chelate-extractable soil cadmium. Soil Science Society of America Journal 64:2162-2168.
Wu, J. W. A. Norvell, D. G. Hopkins, and R. M. Welch. 2002. Spatial variability of grain cadmium and soil characteristics in a durum wheat field. Soil Science Society of America Journal 66:268-275.
Franzen, D. W., D. G. Hopkins, M. D. Sweeney, M. K. Ulmer, and A. D. Halvorson. 2002. Evaluation of Soil Survey Scale for Zone Development of Site-Specific Nitrogen Management. Agronomy Journal. 94:381-389.
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