Agricultural Pond Liming Calculator
Calculate agricultural lime tons to raise pond alkalinity and pH for fish production, based on surface acres and the target application rate.
How This Calculation Works
Lime tons equals surface acres times the application rate in tons per acre, typically 1 to 2 tons per acre for a pond with low alkalinity. Surface acres is length times width divided by 43,560. The lime raises total alkalinity and pH, which improves fish production.
Field Calibration & Rate Reference Chart
| Surface ac | Avg depth | Acre-feet | Copper lb @ 1 ppm |
|---|---|---|---|
| 0.25 | 4 ft | 1.0 | 2.7 |
| 0.5 | 4 ft | 2.0 | 5.4 |
| 0.5 | 6 ft | 3.0 | 8.2 |
| 1.0 | 4 ft | 4.0 | 10.9 |
| 1.0 | 6 ft | 6.0 | 16.3 |
| 1.5 | 5 ft | 7.5 | 20.4 |
| 2.0 | 5 ft | 10.0 | 27.2 |
| 2.0 | 8 ft | 16.0 | 43.5 |
| 3.0 | 6 ft | 18.0 | 49.0 |
| 5.0 | 6 ft | 30.0 | 81.6 |
Common Questions
How much lime does my pond need?
Apply 1 to 2 tons of agricultural lime per surface acre when total alkalinity is below 20 ppm. Base the rate on a water test. Surface acres is length times width divided by 43,560.
Why lime a pond?
Lime raises total alkalinity and pH, which buffers daily pH swings and improves the availability of nutrients for the food chain. That supports better fish growth. It also improves the response to pond fertilizer.
How do I apply lime to a pond?
Spread agricultural lime evenly over the water surface from a boat or shore, or apply it to the dry bottom before filling. It dissolves slowly and works over weeks. Reapply based on periodic water tests.
How often should I lime a pond?
Retest total alkalinity every 2 to 3 years and reapply when it drops below 20 ppm. Sandy, low-alkalinity ponds need lime more often. Heavy rainfall and runoff can deplete alkalinity over time.