1. Have your irrigation water tested.
  2. Select an acid of known strength.
  3. Determine how much of your acid is needed to neutralize 80% of the bases in your water.
  4. Inject the calculated rate of acid into your irrigation water.
  5. Measure the pH of the water as it comes out of the irrigation line.
  6. If the pH is not between 4.5 and 5.0, increase or decrease the amount of acid.
  7. Re-test the water source and irrigated soil about once a year to check for any changes.
Table A-2-1. Properties of common acids.
Acid Strength Rate calculation factor
Sulfuric 93% 8.7
Muriatic (Hydrochloric) 32% 29.6
Phosphoric 85% 6.8