46-0-0 Urea Application Rate Calculator
Calculate urea 46-0-0 product pounds per acre from a target nitrogen rate, with total product, bag counts and bulk tons for the field.
How This Calculation Works
Product pounds per acre equals the target nitrogen rate divided by the analysis percentage, times 100. For 120 pounds of nitrogen per acre from 46-0-0, that is 120 divided by 46 times 100, or about 261 pounds of urea per acre. Total product is that figure times acres, and bags are total product divided by bag weight.
Field Calibration & Rate Reference Chart
| Analysis | Nutrient % | Target lb/ac | Product lb/ac |
|---|---|---|---|
| 46-0-0 Urea | 46 | 100 | 217 |
| 46-0-0 Urea | 46 | 120 | 261 |
| 34-0-0 AN | 34 | 100 | 294 |
| 28-0-0 UAN | 28 | 120 | 429 |
| 18-46-0 DAP | 46 | 60 | 130 |
| 11-52-0 MAP | 52 | 60 | 115 |
| 0-0-60 Potash | 60 | 80 | 133 |
| 10-10-10 | 10 | 60 | 600 |
| 19-19-19 | 19 | 80 | 421 |
| 6-4-0 Milorganite | 6 | 48 | 800 |
Common Questions
How much urea do I need for 120 pounds of nitrogen per acre?
Divide 120 by 0.46 to get about 261 pounds of 46-0-0 urea per acre. The 46 percent analysis means each pound of product carries 0.46 pound of nitrogen. Multiply by acres for the field total.
Why does urea lose nitrogen to the air?
The urease enzyme on soil and residue surfaces converts urea to ammonia gas, which can escape if it is not moved into the soil by rain, irrigation or incorporation. Losses are highest on warm, moist, high-residue surfaces. A urease inhibitor or timely incorporation limits the loss.
Can I blend urea with other fertilizers?
Urea blends with most dry fertilizers, but it is incompatible with superphosphate and ammonium nitrate in bulk because the mixture can become sticky or hygroscopic. Blend shortly before application and keep the pile dry. Check compatibility charts before ordering a custom blend.
Is urea better applied in fall or spring?
Spring application near the time of crop uptake reduces the window for loss, especially on warm soils. Fall application works on cool soils below 50 degrees Fahrenheit where conversion is slow. On high-residue or no-till ground, spring with an inhibitor is usually safer.