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Mass confusion on Ph, soil tests and fertility
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TheJoker
Posted 11/19/2025 20:21 (#11440467 - in reply to #11439977)
Subject: RE: Mass confusion on Ph, soil tests and fertility


IA/MN/WI		Lab techniques can vary, and to make it more confusing, some labs might report to you in Mehlich 3 but they actually ran a Bray and used a math conversion factor to get the report number, or this can happen the other way, they run a Mehlich and repot to as requested in a Bray. Find a single reputable lab and stick with them for at least 3 sampling cycles to give yourself some valid data. And while samples don't change wildly if you pull 3 or 4 ft from the original core location, year over year data does require that you pull from relatively close to the same point. A good soil sampling service will grab 12-15 cores in a 40-50ft radius around the GPS point to actually give you a reliable sample, not all sampling companies do this. Depth of the core matters significantly on a P test as well. P stratifies in the soil, if you pull an 8 inch core but the sample to the lab indicates its a 6in core your PPM levels could easily be 20% lower on your results than what is actually in the top 6 inches.
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