Back to Message List View Responses

Phosphorus content/diagnostic horizon/landslide soils
Author: Mike Wilson     Created on: 3/7/2011    MessageID: 1439

Two general extractants of P in acid soils are Bray and Mehlich3. Citric acid has been used for determination of anthropic horizons, but this extractant is highly dependent on soil pH (and carbonate content), and extracts much more than plant available P. It has been used to evaluate the solubility of rock phosphates, and thus dissolves apatite minerals. The bicarbonate extraction is for alkaline soils.

See the discussion at: http://soils.usda.gov/technical/methods/

The SSL lab manual has a variety of P methods documented and can be found at: http://soils.usda.gov/technical/lmm/




Total messages in this thread... 2

Phosphorus content/diagnostic horizon/landslide soils
    Phosphorus content/diagnostic horizon/landslide soils (current)

      Return to top of page   USDA-NRCS Soils Site
       This site provided as a service of Virginia Polytechnic Institute and State University