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Old 09-26-2012, 08:56 AM
Smallaxe Smallaxe is offline
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Join Date: May 2007
Location: Central Wisconsin
Posts: 10,091
Phosphorus is mined from the soil by the roots of the plants, in a different way than you soil test calls "Available P"... Annual ag crops such as corn, take a lot of P right now and don't have the help for root hairs to mine P from the soil...
So the question about P being low,,, if you mulch mow and your grass roots are healthy and active, getting deeper and deeper into the soil,,, do you want a fresh application of soluable P to inhibit that activity of the AM Fungi...

The idea of P being low is very likely, a laughable scenario when it comes to growing grass... grass needs more P??? I don't think so,,, at least not around here... check with knowledgeable people in your area and see if anyone has benefitted from P applications...
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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