Stefan,
Thanks for sharing your thoughts. Please share if you do have spectra for any other P (i.e., not +5).
Best regards,
Ganga
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Ganga M. Hettiarachchi, Ph.D.
Professor of Soil and Environmental Chemistry
Department of Agronomy
2107 Throckmorton Plant Sciences Center
1712 Claflin Road
Kansas State University
Manhattan, KS 66506 USA
785-532-7209 (office)
785-532-6094 (FAX)
http://www.agronomy.k-state.edu/research/soil-and-environment/soil-environment-chem/
http://www.agronomy.k-state.edu/people/faculty/hettiarachchi-ganga/index.html