Table of Contents
Use these formulas to create nitrogen-only prescriptions for your farm. They are available in both dry and liquid formats to suit your fertilizer application method.
- You can generate prescriptions based on:
- Prior years’ yield data to create management zones
- A flat-rate yield goal
- A yield potential map (available for Complete Customers)
Each crop includes two formula options: Dry and Liquid.
Choose the appropriate format based on the type of product you’re applying:
Use the Dry formula if applying:
- Urea
- Anhydrous (measured in lbs/acre)
- Any other nitrogen blend measured in lbs/acre
Use the Liquid formula if applying:
- 28% or 32% UAN
- Anhydrous (measured in gallons/acre)
- Any other nitrogen blend measured in gallons/acre
Vars Explained
Variables
-
Yield Adjustment
- Use this to apply more or less fertilizer based on your previous yield layer. For example, enter 110 to apply 10% more fertilizer than the base rate.
-
Split %
- Use this if you plan to apply a split nitrogen rate. For instance, enter 60 to apply 60% of the total intended nitrogen in the current pass.
-
N per Bushel
- The default is our recommended nitrogen per bushel rate. You may adjust this based on your crop type or local conditions.
Note: For wheat formulas, particularly spring wheat, the nitrogen requirement is closer to 2.2 lbs/bu, compared to 1.5 lbs/bu for winter wheat.
- The default is our recommended nitrogen per bushel rate. You may adjust this based on your crop type or local conditions.
-
Lbs N per %OM
- This value determines how much nitrogen is credited based on organic matter (OM). The default is 20 lbs N per 1% OM, but you can adjust it:
- Use 10 in cooler climates with shorter growing seasons.
- Use 30 in warmer regions with longer seasons.
-
Blend %N
- Enter the nitrogen percentage of your fertilizer blend:
- 46 for Urea
- 82 for Anhydrous Ammonia
-
Lbs per Gallon (Liquid Only)
- Enter the product density in pounds per gallon. You can find this value on the product label.
-
Legume Credit
- Enter a nitrogen credit if your previous crop was a legume, such as soybeans or alfalfa.
Layers
-
Soil OM
- This layer pulls from your most recent soil sample and represents the organic matter percentage.
-
Yield (Crop)
- Select the yield layer you want to base your nitrogen rate on. If no reliable data is available, you may switch to a flat rate.
-
Soil NO₃⁻N
- Use this layer to credit nitrogen from residual soil nitrate. Only use it if the soil sample was taken in the fall or spring immediately before planting.
