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A Comparison of Nitrogen, Phosphorus, and Carbon in Sediments and Soils of Cultivated and Noncultivated Watersheds in the North Central States¹

ABSTRACT

Soil and sediments from six cultivated watersheds and from six noncultivated watersheds were sampled and the concentration of nitrogen, phosphorus, and carbon was determined. No significant difference was found in the concentration of N, P, or C with depth in the soils or sediments. Concentration of N, P, and C were not significantly different in the soils and sediments of the cultivated watersheds; however, the sediments of the noncultivated watersheds had significantly less N and organic P than the watershed soils. Less accumulation of N, P, and C is occurring in the noncultivated watershed sediments than in the cultivated watershed sediments. These data indicate that sediment source is probably an important factor in determining N, P, and C concentration in reservoir sediments.

Key Words: nutrient movement • nutrient accumulation

¹ Contribution of the USDA Sedimentation Laboratory, Alabama- North Mississippi Area, Agricultural Research Service, USDA, in cooperation with the University of Mississippi, the Mississippi Agric. & Forestry Exp. Sta., and the U. S. Atomic Energy Commission (Contract 49-7[3029]).

² Soil Scientist, Chemist, and Soil Scientist, Oxford, MS 38655.

Received for publication October 24, 1974.