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Central Missouri | You have to remember that soil testing tries to mimic mother nature by using a weak acid solution to free nutrients from the colloid and puts them in solution to be measured by the soil test. The creation of substances that free nutrients is usually done by microbes in the soil.
Thus it makes sense that the addition of manure not only adds nutrients but it stimulates the microbe activity and numbers which free nutrients in the soil reserve.
Thus makes sense that soil test levels and base saturations would increase.
If one has high nutrient availability even with low soil tests you can raise really high yields. Its the amount available to the plant not necessarily the ampunt on the soil test that is the yield driving factor.
You can have high soil test and low availability and run into a yield brick wall. Been there done that.
Once in the medium range on soil test its more important to focus on availability driven by microbial activity and liebechs law of the minimum. Jmo | |
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Raising K levels
