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Journal of Environmental Quality Abstract - Short Communications

The MANAGE Database: Nutrient Load and Site Characteristic Updates and Runoff Concentration Data


This article in JEQ

  1. Vol. 37 No. 6, p. 2403-2406
    Received: Feb 12, 2008

    * Corresponding author(s): daren.harmel@ars.usda.gov
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  1. Daren Harmel *a,
  2. Song Qianb,
  3. Ken Reckhowb and
  4. Pamela Caseboltc
  1. a USDA-ARS, 808 E. Blackland Rd., Temple, TX 76502
    b Nicholas School of the Environment and Earth Sciences, Duke Univ., Durham, NC 27708-0328
    c Texas State Soil and Water Conservation Board, Temple, TX 76503


The “Measured Annual Nutrient loads from AGricultural Environments” (MANAGE) database was developed to be a readily accessible, easily queried database of site characteristic and field-scale nutrient export data. The original version of MANAGE, which drew heavily from an early 1980s compilation of nutrient export data, created an electronic database with nutrient load data and corresponding site characteristics from 40 studies on agricultural (cultivated and pasture/range) land uses. In the current update, N and P load data from 15 additional studies of agricultural runoff were included along with N and P concentration data for all 55 studies. The database now contains 1677 watershed years of data for various agricultural land uses (703 for pasture/rangeland; 333 for corn; 291 for various crop rotations; 177 for wheat/oats; and 4–33 yr for barley, citrus, vegetables, sorghum, soybeans, cotton, fallow, and peanuts). Across all land uses, annual runoff loads averaged 14.2 kg ha−1 for total N and 2.2 kg ha−1 for total P. On average, these losses represented 10 to 25% of applied fertilizer N and 4 to 9% of applied fertilizer P. Although such statistics produce interesting generalities across a wide range of land use, management, and climatic conditions, regional crop-specific analyses should be conducted to guide regulatory and programmatic decisions. With this update, MANAGE contains data from a vast majority of published peer-reviewed N and P export studies on homogeneous agricultural land uses in the USA under natural rainfall-runoff conditions and thus provides necessary data for modeling and decision-making related to agricultural runoff. The current version can be downloaded at http://www.ars.usda.gov/spa/manage-nutrient

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Copyright © 2008. American Society of Agronomy, Crop Science Society of America, Soil Science SocietyAmerican Society of Agronomy, Crop Science Society of America, and Soil Science Society of America