How to Add Humic Acid to Aerobic Compost Tea


Humic acids help to break up compacted soils, boost seed germination, enable plants to absorb micronutrients in the soil and retain soil moisture. Humic acids are commonly found in peat, manure, lignite coal and leonardite. They are sold commercially as a compost tea additive in powder form. When added to compost tea, humic acids can also act as food for the active microorganisms contained in the tea.

Step 1

Add humic acid to your compost tea if your plants are having any disease-related problems and you need to boost water retention and nutrient absorption. You can also add humic acid to boost the fungal component in your compost tea.

Step 2

Add the humic acid to your compost tea right before you apply the tea to your plants. You can add the humic acid as soon as the brew settles and is strained.

Step 3

Mix in only one tablespoon of humic acid to about 5 gallons of compost tea, if the humic acid powder is a high-concentration variety. Stick with the 1 tablespoon of humic acid if the powder contains 85 percent or more humic acid and is 90 percent or more soluble.

Tips and Warnings

  • Adjust your dosage of humic acid to 2 or 3 tablespoons if the powder is less than 75 percent soluble and contains less than 65 percent humic acid.

Things You'll Need

  • Humic acid
  • Compost tea


  • TeraVita Humic Acids

Who Can Help

  • Perfect Perennials: Compost Tea
Keywords: humic acid dose, using humic acid, add humic acid to compost tea

About this Author

Sarah Terry brings 10 years of experience writing novels, business-to-business newsletters, and a plethora of how-to articles. Terry has written articles and publications for a wide range of markets and subject matters, including Medicine & Health, Eli Financial, Dartnell Publications and Eli Journals.