Fred Magdoff, Bill Jokela, Robert Durieux, Yushan
We conducted a series of lab experiments on samples of 80 soils from Vermont and eastern New York to assess the role of various soil properties, including different P soil tests, on crop availability and P release to surface runoff. Results confirmed that the reactive aluminum test provides a good measure of a soil's capacity to tie up added phosphorus. These results have already been used to improve P soil test recommendations. We also showed that the UVM test for available P may be a good indicator of the potential for a soil to release P to surface runoff. See research publication, Comparison of phosphorus soil test extractants for plant availability and environmental assessment. Magdoff et al., 1999. Soil Sci. Soc. Am. J. 62.
For more discussion, go to The
Vermont Phosphorus Index.
This site is maintained by Sid.Bosworth@uvm.edu, Plant & Soil Science Department, University of Vermont.
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