References

Brady, N.C. 1974. The Nature and Property of Soils. 8th Ed. Macmillan Publishing Company, Inc., New York, N.Y.

Ferguson, R.B., C.A. Shapiro, and G.W. Hergert. 1994. Fertilizer Nitrogen Best Management Practices. NebGuide G94-1178A. University of Nebraska, Cooperative Extension Service, Lincoln, NE.

Harper, J.F. 1984. Uptake of Organic Nitrogen Forms by Roots and Leaves. In R.D. Hauck (ed.) Nitrogen in Crop Production. American Society of Agronomy, Madison, WI.

Hase, W.J., et al., 1957. Nitrogen and Carbon Changes in Great Plains Soils as Influenced by Cropping and Soil Treatments, Tech. Bull. 1167 (Washington, D.C.: U.S. Dept. Agric.)

Katupitiya, A. 1995. Long-term Tillage Effects on Nitrate Movement and Accumulation and Denitrification in the Root and Intermediate Vadose Zones. Ph.D. Dissertation, University of Nebraska.

Kissel, D.E. 1989. Management of Urea Fertilizers. North Central Regional Publication No. 326.

Peterson, T.A., T.M. Blackmer, D.D. Francis, and J.S. Schepers. 1993. Using a Chlorophyll Meter to Improve N Management. NebGuide G93-1171A. University of Nebraska, Cooperative Extension Service, Lincoln, NE.

Stevenson, F.J. Origin and Distribution of N in Soil. In F.J. Stevenson (ed.) Nitrogen in Agricultural Soils. 1982. American Society of Agronomy, Madison, WI.