The worksheets at left are designed to help find the most
economical level of fertilizer for the crop listed. Examples have been constructed for
crops where commercial fertilizers are commonly applied. Some things to
keep in mind as you use these tools:
- Fertilizer quantities must be entered in pounds of crop-available nutrient
per acre. This will not be the same as pounds of fertilizer applied
For example: 1 ton (2,000 lb.) of 46-0-0 fertilizer
contains 46% nitrogen or 920 lbs. of nitrogen per ton of fertilizer.
- The first entry for fertilizer pounds applied will be zero pounds applied
per acre and should have a corresponding yield value. This represents the
crop yield with no additional fertilizer applied.
- Zero (0) should be entered for any fertilizer or yield values where
additional data is not available.
- Fertilizer costs must be entered on a per pound of available nutrient
applied basis. As per above, this will not be the same as cost per
pound of fertilizer applied per acre.
For example: 46-0-0 fertilizer at $180/ton yields 920 lb. of
nitrogen at 19.57 cents/lb.
- Crop harvest costs should include all costs associated with
harvesting an additional unit of crop. For example, swath, bale, and stack
for a crop of hay.