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UNGER & JONES: EFFECT OF SOIL WATER AND GROWING SEASON STRAW MULCH ON GRAIN SORGHUM 129 <br />LITERATURE CITED <br />1. Bond, J. J., J. F. Power, and W. O. Willis. 1971. Soil water <br />extraction by N- fertilized spring wheat. Agron. J. 63:280- <br />283. <br />2 Carlson, C. W., D. L. Grunes, J. Alessi, and G. A. Reichman. <br />1961. Corn growth on Gardena surface and subsoil as af- <br />fected by applications of fertilizer and manure. Soil Sci. <br />Soc. Am. Proc. 25:44 -47. <br />3. Haas, H. J., and W. O. Willis. 1962. Moisture storage and <br />use by dryland spring wheat cropping systems. Soil Sci. Soc. <br />Am. Proc. 26:506 -509. <br />4. Power, J. F., and J. Alessi. 1970. Effects of nitrogen source <br />and phosphorus on crested wheatgrass growth and water use. <br />J. Range Manage. 23:175 -178. <br />5. Power, J. F., J. J. Bond, F. M. Sandoval, and W. O. Willis. <br />1974. Nitrification in Paleocene shales. Science 183:1077- <br />1079. <br />6. Power, J. F., R. E. Ries, F. M. Sandoval, and W. O. Willis. <br />1975. Factors restricting revegetation of strip -mine spoils. <br />p. 346 -366. In W. F. Clark (ed.) Proc. Fort Union Coalfield <br />Symposium. Mont. Acad. Sci., Billings, Mont. <br />7. Rogler, G. A., and H. J. Haas. 1947. Range production as <br />related to soil moisture and precipitation in the Northern <br />Great Plains. J. Am. Soc. Agron. 39:378 -379. <br />8. Sandoval, F. M., and J. F. Power. 1978. Labor'tory methods <br />recommended for chemical analysis of mined -land spoils and <br />overburden in western United States. USDA Handbook no. <br />525. <br />9. U.S. Department Agriculture. 1978. Soil survey of Mercer <br />County, North Dakota. USDA -SCS, U.S. Government Print- <br />ing Office, Washington, D.C. <br />