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Mass confusion on Ph, soil tests and fertility
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yadayada
Posted 11/20/2025 06:07 (#11440675 - in reply to #11439382)
Subject: RE: Mass confusion on Ph, soil tests and fertility


SC Minnesota		I have been soil testing for 35 years and can tell some whopper of stories about how some of the competition pulls soil samples. Having someone not only reputable, but also knowledgeable pulling the cores is critical to getting consistent and accurate results. I know this is rare these days as many places hire teenagers or college students in the summer to pull samples and has lead to many inconsistencies. Also be waring looking at soil results from two different samplers/coops/labs as they could be using different labs that are using different testing methods. Stick with one reputable lab. Now here's the kicker, you could have the same lab used by different samplers and they use different scales to present the data to you. I had sampled a farm for a client and the landowner decided to start farming it themselves and had it sampled. They were irate with the renter for depleting the soil on there farm while renting it. It turns out the coop had sampled the farm and used a scale that said the soils were low and medium in P and K compared to my tests that said high and very high. Looking at the data showed both maps had an average field level within 1-2 ppm on P and around 5 ppm on K. Big blow up about virtually the same test. And people wonder why farmers are wary of soil data.
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