A Nutrient Use Balance Assessment for Nine Geographic Regions within Arkansas. (A05-slaton770352-poster)
Authors:
N.A. Slaton* - Univ. of Arkansas M.B. Daniels - Univ. of Arkansas K.R. Brye - Univ. of Arkansas T.C. Daniel - Univ. of Arkansas D.M. Miller - Univ. of Arkansas R.J. Norman - Univ. of Arkansas M.C. Savin - Univ. of Arkansas
Abstract:
Knowledge of the balance between nutrient inputs and removal is required for developing
nutrient-management strategies. The objective of this assessment was to describe the balance between the predominate inorganic and organic N, P, and K sources and the amount of nutrients exported by harvested crops for nine geographically defined districts within Arkansas from 1997 and 2001. The total N, P, and K removed by harvested crops was subtracted from nutrients imported as inorganic fertilizer or excreted as poultry, turkey, dairy, and hog manures to find the net-nutrient balance for each district. The net balances for N, P, and K were distributed across the hectarage used for row crop, hay, pasture, or combinations of these land uses. Three districts in the eastern one-third of Arkansas
contained 95% of the row-crop hectarage; accounted for 82 to 86% of inorganic N, P, and K fertilizer use; and had net N and P balances that were near zero or slightly negative. The six districts in the western two-thirds of Arkansas accounted for 89 to 100% of the animal populations, 16% of the hay/pasture hectarage, and had net positive balances for N and P with excess P ranging from 6 to 34 kg P/ha when distributed across row-crop, hay, and pasture hectarage. Statewide, Mehlich-3 P increased by 2.5 mg P/kg/yr on soils used for cool- and warm-season grass production between 1995 and 2002, but remained constant for five row-crop commodities.
Speaker Information: Nathan Slaton, Univ. of Arkansas, 1366 West Altheimer Drive, Fayetteville, AR 72704; Phone: 479-575-3910; E-mail: [email protected]
Session Information: Wednesday, November 5, 2003, 4:00 PM-6:00 PM Presentation Start: 4:00 PM (Poster Board Number: 230)
Keywords: Nutrient Management; Phosphorus; environmental quality; Nitrogen
