Variable Rate Fertilizing  

For 2019 I established corn yield goals in each of the polygons. Using recommendations from two AgPhD soils clinics I built a spreadsheet to find how much fertilizer would be needed for each grid. The fertilizer dealer has the ability to vary the rate of fertilizer as they spread it. I created variable rate prescriptions for them from the QGIS mapping software.

lbs. of Potash (giving phospherus).

Potassium is often purchased in one of two compounds, MAP or DAP.