Many of you know that I am a big proponent of soil testing. Actually, I’m a big proponent of all types of lawn, plant and soil testing. But you’re probably unaware that there are many tests that I outright dismiss, and there are other tests that you may not have ever heard of that I’m studying very hard to learn and make recommendations from.
I find that many tests are frustrating and worse yet, some are useless. Why? I’ve studied and read on this subject a lot, and I’ve found two categories of “failure”.
The first category of failure is the test that measures something that doesn’t correlate to overall performance in the real world. Let’s say I’m interested in whether a glass is empty, full, or partially full of water – and I can’t just observe it. Then I find out that I can get a test for “fluid amount in a glass”. So I pay for the test and get a result – the glass is half full of fluid. Do I assume that glasses are filled with water 90% of the time, and therefore there is a 90% chance that the glass is half-full of water? 90% of the time I’d be right. That’s good, except for the person that gets the glass of “brake fluid” to drink 10% of the time.
Soil tests are sometimes like that. You’re measuring something, but it may or may not tie to improved performance in the plants that are in the soil. I might measure Calcium in the soil and find that I have 1000 ppm of Calcium. Great, right? Well, maybe. What if only 200 ppm of the Calcium is actually available to plants (including grass)? A different story.
The second category of failures is one in which innocent assumptions are made by scientists doing research – and the assumptions are flawed. There is a famous example where scientists determined that the sap of most plants is between pH 4.5 and pH 5.0. So the scientists recommended that foliar feeding be done and the pH adjusted chemically to pH 4.5 to pH 5.0, so that the foliar nutrient would be just at the right pH for the plant. Very logical.
Except that all of the plants selected for the “what is the pH of sap” part of the research were from plants at farms of a mass-production agricultural corporation that just threw N-P-K on the soil and sold whatever came out from the plants. The sap of those plants was pH 4.5 to pH 5.0. The Brix values were horrible.
Later, when the results came out, the smaller-production farmers screamed that the pH value was very wrong. The sap of healthy, properly-raised on good soil plants was between pH 6.0 and pH 7.0, and the Brix level many, many points higher. Right where nature’s chemistry of everything else predicted it would be. Did the University back off on the research conclusions? No. They said something about the need for the research at the mass-production level. Did they put that in the report? No. So, we can still find that research today and we’ll adjust the pH for foliar feeding materials down to pH 4.5 – and have University research to prove it is correct. The results of the research actually CAUSE problems because the standard is poorly-raised plants.
In other words, we don’t test for excellence, we test to our expectations of mediocrity.
It is the sentence above that led me to begin questioning everything I had learned about testing, and started the reading of Albrecht and Reams to go back to the basics.
It was the beginning of what I call the HELM method…
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