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United States Department of Agriculture

Agricultural Research Service

Title: Phosphorus Indexing in Cropland: the Iowa P Index

Authors
item Mallarino, Antonio - IOWA STATE UNIVERSITY
item Stewart, Barbara - USDA-NRCS
item Baker, James - IOWA STATE UNIVERSITY
item Downing, John - IOWA STATE UNIVERSITY
item Fenton, Thomas - IOWA STATE UNIVERSITY
item Sawyer, John - IOWA STATE UNIVERSITY
item Miller, Gerald - IOWA STATE UNIVERSITY
item Kovar, John
item Sauer, Thomas
item Voss, Reggie - IOWA STATE UNIVERSITY

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: August 8, 2001
Publication Date: August 8, 2001
Citation: MALLARINO, A.P., STEWART, B.M., BAKER, J.L., DOWNING, J.A., FENTON, T.E., SAWYER, J.E., MILLER, G.A., KOVAR, J.L., SAUER, T.J., VOSS, R.D. PHOSPHORUS INDEXING IN CROPLAND: THE IOWA P INDEX. MEETING ABSTRACT. 2001.

Technical Abstract: Excess P reaching surface waters through soil erosion, water runoff, and subsurface water flow produces eutrophication. The P Index will help conservation planners and land users to assess the risk of P reaching surface water from fields and to make management decisions to reduce that risk. The Iowa P Index provides a relative risk rating that can be used to prioritize fields for nutrient and soil management practices. Source factors are arranged in a multiplicative manner within three components representing transport mechanisms: erosion (sediment loss), runoff (water loss), and subsurface drainage (water flow through tiles or coarse subsoil/substrata). The Index sums estimates of P delivery to get an overall estimate that is placed in one of 5 categories (very low to very high). The Index is intended to be part of the NRCS nutrient management planning process developed by the land user and resource planner and is not to be used as a regulatory tool. The current version will be tested and modified periodically as new research data become available.

Last Modified: 11/28/2014
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