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This article in AJ

  1. Vol. 101 No. 4, p. 764-768
    Received: Oct 22, 2008

    * Corresponding author(s): j-muir@tamu.edu


Herbage, Phosphorus, and Nitrogen Yields of Winter-Season Forages on High-Phosphorus Soil

  1. James P. Muir * and
  2. John R. Bow
  1. Texas A&M AgriLife Research, 1229 N U.S. Hwy. 281, Stephenville, TX 76401


In climates where cool seasons can produce a forage crop, annual grasses and forbs can be used on dairies to recycle nutrients back to the animals and to phytoremediate soils high in P or N. In north-central Texas, on a Windthorst fine sandy loam (fine, mixed, thermic, Udic Paleustalf) with 250 mg P kg−1, an on-dairy trial measured yields of dry matter (DM), N, and P, as well as fiber fractions of five cool season legumes, six grasses, and two brassicas. Some grasses yielded >8 Mg herbage DM during high rainfall years, whereas the most productive legumes and brassicas could only match half that production. Because the soils were high in nitrate-N and plant-available P, concentrations of these were high in herbage, resulting in >150 kg N ha−1 yield in seven of the entries and >20 kg P in eight entries during a high-rainfall year. Potential for extracting, fixing, and sequestering N and P, combined with generally low fiber concentrations, indicated that some of these forages hold promise for nutrient recycling or phytoremediation of high-N or -P dairy soils with the added benefit of producing nutritious forage for the dairies.

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Copyright © 2009. American Society of AgronomyCopyright © 2009 by the American Society of Agronomy