P fertilizer recommendations as a 2x to 18x multiple of MLSN

After I wrote this post about the differences in P fertilizer recommendations when using different methods for soil test interpretation, I heard from some readers that it seemed I was taking something simple—MLSN—and making it seem complicated.

That was exactly opposite of what I was trying to do!

In this post, I’ll jump to the conclusions, to the bottom line, in the chart shown above.

I was working with 50,000 simulated sites. Each had its own soil test value and N rate. If SLAN or SPF recommendations were used, those methods would recommend from 2 to 18 times more P than would the MLSN method.

I discussed this on the ATC Doublecut.

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