Can anyone help me convert olsen p of 16.5 to bray-1p|||Your Bray P is either 30ppm or 0-5ppm. The correct answer depends on your soil's pH. Let me explain: Olsen P is an alkaline extraction. Bray P is an acid extraction. You need to know if you have an alkaline or acid soil. If you are alkaline, there should be no need to convert as the Olsen P should be accurate. If you have an acid soil, you may want to re-run soil analysis with Bray P. I work with alkaline soils, and I have experienced grower's panic calls because the soil test P comes back at 3ppm and they just spent $300 on phosphate!! After finding that its Bray P, I tell them to relax and tell them to re-run with a lab that does Olsen P. It then comes back around 20ppm and everybody is happy and cheerful. Check out this presentation from Iowa State. P.11 has some graphs that can help you in a conversion. You'll see why the pH of your soil matters in your conversion. http://www.agronext.iastate.edu/soilfert鈥?/a>

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