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Research ArticleResearch

Nitrogen cycling in conventional and no-tillage agroecosystems in the Southern Piedmont

Garfield J. House, Benjamin R. Stinner, D. A. Crossley, Eugene P. Odum and George W. Langdale
Journal of Soil and Water Conservation May 1984, 39 (3) 194-200;
Garfield J. House
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Benjamin R. Stinner
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D. A. Crossley Jr.
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Eugene P. Odum
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George W. Langdale
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ABSTRACT:

Nitrogen (N) dynamics in conventional and no-tillage agroecosystems of sorghum (1978-1979) and soybeans (1980-1981) in the Southern Piedmont were compared. Measurements of ecological processes, including crop and weed production, litter decomposition, and crop consumption by insects, along, with solution chemistry of soil, precipitation, and groundwater, provided the data base for generating annual N budget models. Data represented four annual cropping cycles (two sorghum/rye and two soybean/rye). Crop residue placement practices (i.e., tillage or its absence) were identified as major regulators of N cycling in these agroecosystems. Soil tillage accelerated rates of plant residue decomposition as well as the total amount of N transferred between several agroecosytem components. Decomposition of plant and animal residues under continuous no-tillage practices mimics that found in natwal terrestrial ecosystems. By immobilizing N at or near the soil surface, no-tillage systems recycle N more slowly but also more efficiently (as measured by cycling indices) than conventional tillage.

Footnotes

  • Garfield J. House is an assistant professor in the Department of Entomology. North Carolina State University. Raleigh, 27650. Benjamin R. Stinner is an assistant professor in the Department of Entomology. Ohio Agricultural Research and Development Center. Wooster, 44691. D. A. Crossley, Jr., is a professor in the Department of Entomology, University of Georgia, Athens, 30602. Eugene P. Odum is director of the Institute of Ecology. University of Georgia, Athens, 30602. George W. Langdale is a soil scientist at the Southern Piedmont Conservation Research Center. Agricultural Research Service, U.S. Department of Agriculture, Watkinsville, Georgia 30677.

  • Copyright 1984 by the Soil and Water Conservation Society

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Journal of Soil and Water Conservation: 39 (3)
Journal of Soil and Water Conservation
Vol. 39, Issue 3
May/June 1984
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Nitrogen cycling in conventional and no-tillage agroecosystems in the Southern Piedmont
Garfield J. House, Benjamin R. Stinner, D. A. Crossley, Eugene P. Odum, George W. Langdale
Journal of Soil and Water Conservation May 1984, 39 (3) 194-200;

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Nitrogen cycling in conventional and no-tillage agroecosystems in the Southern Piedmont
Garfield J. House, Benjamin R. Stinner, D. A. Crossley, Eugene P. Odum, George W. Langdale
Journal of Soil and Water Conservation May 1984, 39 (3) 194-200;
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