University of Vermont

Soil Nutrient and Manure Research at The University of Vermont Field calibration of phosphorus soil tests for improving phosphorus management on Vermont’s dairy farms

Fred Magdoff, Bill Jokela, Evan Stewart,

Duration: 1994-1997

A soil test is only as good as the research supporting its use as an indicator of plant availability and fertilizer need. To this end, we conducted trials on twelve farm fields with a range of soil types and P soil test levels in several counties in Vermont. Phosphorus was applied as a starter band, as a broadcast application, or as a combination of both, and corn silage yields were measured. Yield increases from the application of starter and/or broadcast P fertilizer ranged from zero to 50%. Yield response results from these trials were combined with those from other VT and NY studies to establish an optimum soil test level of 4 to 7 ppm. This information has been incorporated into a new revision of the Vermont nutrient recommendations program, designed to provide the best economic return to the use of fertilizer while avoiding adverse effects on water quality.

This site is maintained by, Plant & Soil Science Department, University of Vermont.

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Last modified May 26 2004 12:55 PM

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