Recordkeeping for GPM: Hand Calculation
This one calculation per page sheet lets you fill in the blanks to calculate how much you nitrogen you applied using gpm and run time and your lab data.
Hand Calculation for GPM 1 per page
The next worksheet allows you to keep a track of lagoon water nitrogen applications made on each field as they occur. Use one worksheet per field for each year or crop season. This worksheet prints on legal size paper.
Hand Calculation for GPM season
Here are detailed instructions on how to fill out this worksheet:
How to use the gpm + run time hand calculation worksheet
After you have calculated your nitrogen applications, use this worksheet to calculate how much phosphorus and potassium you have applied. This worksheet prints on regular 8-1/2 x 11 in paper.
Hand Calculation for P & K season
If you would like the worksheet to do the math for you, here is the identical Excel spreadsheet with the formulas already programmed in. You will still want to use one sheet for each field. You will need the Microsoft Excel at least version 2003 or Microsoft Works.
Easy Calc Nitrogen for GPM Excel Spreadsheet
Easy calculations for phosphorus and potassium Excel Spreadsheet