2,4-D Amine Tank Mix Calculator
Plan a 2,4-D amine burndown or post-emerge pass with the correct pints-per-acre rate, carrier volume and tank loads for the field, plus drift precautions.
How This Calculation Works
2,4-D amine is usually labeled in pints or quarts per acre, so convert to ounces per acre first: 1 pint equals 16 ounces and 1 quart equals 32 ounces. Product per tank is the ounces-per-acre rate times acres per tank, divided by 128. Carrier volume comes from the calibrated GPA and is kept separate from the product figure.
Field Calibration & Rate Reference Chart
| Ground speed | Nozzle pressure | Typical GPA | Droplet class |
|---|---|---|---|
| 4 mph | 20 psi | 12 | Coarse |
| 5 mph | 25 psi | 14 | Coarse |
| 6 mph | 30 psi | 15 | Medium |
| 7 mph | 35 psi | 16 | Medium |
| 8 mph | 40 psi | 18 | Medium |
| 9 mph | 45 psi | 19 | Fine |
| 10 mph | 50 psi | 20 | Fine |
| 12 mph | 55 psi | 22 | Fine |
| 14 mph | 60 psi | 24 | Very fine |
| 16 mph | 65 psi | 26 | Very fine |
Common Questions
What is the typical 2,4-D amine rate per acre?
Burndown and small-weed rates commonly run 1 to 2 pints per acre, while tougher perennials may call for 2 to 4 pints. The label sets the maximum for the crop and growth stage. Always convert pints to ounces before the tank math.
Why is 2,4-D amine less volatile than the ester form?
The amine salt has a much lower vapor pressure than the ester, so it is far less likely to volatilize and move off target after application. It still drifts as spray droplets, so droplet size and wind still matter. Use the amine form near sensitive broadleaf crops.
What temperature is too hot for spraying 2,4-D?
Volatilization and drift risk rise sharply above about 85 degrees Fahrenheit, and many labels restrict application at higher temperatures. Spray in the cooler part of the day and avoid inversions. If the forecast is hot, switch to a lower-volatility formulation or delay the pass.
How long before planting can I apply 2,4-D?
Plant-back intervals depend on the rate and the following crop, ranging from about 7 days for small grains to 30 days or more for sensitive broadleaves. Read the specific label table rather than assuming a single number. Soil moisture and organic matter also affect breakdown.