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Influence of Crop Management Practices on Nutrient Movement Below the Root Zone in Nebraska Soils¹

ABSTRACT

Deep profile sampling under different water and crop management systems revealed limited movement of N and none of P from the rooting profile of nonirrigated Nebraska soils. Leaching of N to the water table was apparent in most irrigated soils located on valley positions and in sandy soils of the uplands. Alfalfa (Medicago sativa L.), with its deep rooting system, was noted to be an effective scavenger of inorganic N that may have accumulated under prior annual crops.

Key Words: N and P movement • ground-water pollution • deep profile nutrient monitoring • leaching with irrigation • alfalfa • corn • fallow wheat

¹ Published with the approval of the Director as Pap. No. 4070, Journal Series, Nebraska Agric. Exp. Stn., Lincoln, NE 68583. Work reported was supported in part by the Office of Water Resour. Res., U. S. Dep. of the Interior, under Public Law 88-379, by TVA and by RRF, CSRS under NC-98 regional project.

² Instructor, Postdoctoral Fellows, and Professor of Agronomy, respectively.

Received for publication September 19, 1976.

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