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Mass confusion on Ph, soil tests and fertility
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md.mcwill
Posted 11/19/2025 10:43 (#11439907 - in reply to #11439850)
Subject: RE: Mass confusion on Ph, soil tests and fertility


95 miles NW of Quitaque, TX		I was a soil scientist for an agency in the late 80's. They sent me to SE Montana to help finish a soil survey. I poked a hole with the soil probe. The entire tube was pure sand. We did not have a soil like that to choose from. I move the tube 4". I got a totally different soil. I picked the second probe as that was a soil that I could pick. There was another soil that was sand over clay. Say a foot of sand over the clay. But the one I found was clay over sand. Yes a foot of clay over the sand. Someone asked a question of the survey leader and he asked others. Most of us had seen that soil. He said put it as the as the soil they had found as sand over clay. I found say 20 acres. We did and did not worry. As a soil scientist, you are told that a soil has to be over a certain number of acres to map out otherwise you just include as an inclusion.

I am telling that story to show that soils vary greatly sometimes over very small distances. Another thing is most if not all soils have inclusions. Inclusions are different soils that you can (most of the time) see the differences. There are other soils that look the same but chemically are different which you cannot see the differences.

I said all this to say that soils can change over a small distance.
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