Thread: CEC formula?
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Old 03-12-2013, 10:42 AM
Smallaxe Smallaxe is offline
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Join Date: May 2007
Location: Central Wisconsin
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Useable or accessable CEC is dependant on soil structure... all the math falls apart if the soil w/out aggregate structure...
For example, if your 20% clay was a platy layer of water pounded dirt in which the OM floats on top of it,,, your cation exchange will not be able to find a root hair to exchange with, as a practical matter...

Just how well would a clay based exchange site adsorb or grab hold of any nutrient from a fertilizer application when it is all packed tight in a platy structure??? Does water have to perculate through the clay plates in or for the NPK to find a cation exchange site???or will they move through as a result of "+", "-" attractions at the molecular level???
Now that I know that clay's texture(platelets) has nothing to do with water infiltration, percolation, or drainage
,,, I wonder what does...
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