Boom Sprayer Calibration:
This calculator determines gallons per acre applied by boom sprayer. These sprayers are suitable for pre-plant, pre-emergence or post-emergence applications in cropland, pastures and rangeland.

 Dry Fertilizer Calculator:
This calculator is for use with soil test results that will allow you to compare prices and furnish spread rates. Enter the price of fertilizer in your area, your acreage and N-P-K needed (from your soil test recommendation).

Planter Calibration Calculator:
This tool calculates the approximate number of seeds per acre and number of pounds per acre that a planter is set to deliver.

 http://www.answerplot.com/
This website gives data from crop plot trials all over the country, including Napoleon.