been doing our own soil sampling for a few years now, and purchased Farmworks software a year or so ago and looking to make my own fertilizer reccs.

 what are some simple formulas to use?? 

How many lbs of Potassium and Phosphorous does it take to raise 1 ppm?

And has farmworks come out with a more advanced equation based reccs to plug into in the site pro side of things??

Thanks,