Compost extract (not tea) efficiently delivers beneficial soil microbiology. The key is using enough compost while filtering out particulates for smooth application. Suggested rates of compost (1-2.5 lbs per gallon of water) are based on our ability to achieve desired microbial populations and biomass concentrations using various methods. Note that no two compost extracts are the same and factors such as rate of compost, duration, degree of agitation, and technique all have bearing on microbial concentrations. 1 cu yd of our compost can treat 10-25 acres in compost extract form.

• Bucket

  Add at least 1 lb compost per gallon of water to a 400-micron mesh bag and extract into 4 gallons of water for 2-5 minutes, submerging, massaging, and draining repeatedly. 

• Barrel/Tank

  Extract at least 1 lb compost per gallon of water in cycles using 400-micron mesh bags (~10 lb/bag) for 2-5 minutes each, submerging, massaging, and draining repeatedly. 

• Compost Tea Brewer (to make extract)

  Fill tank, turn on aeration, then extract at least 1 lb compost per gallon of water in cycles using 400-micron mesh bags (~10 lb/bag). Suspend and submerge bags in water for 15-30 minutes allowing agitation from aeration to perform the extraction. It is still recommended to massage and drain each bag repeatedly before removing. 

• Commercial Extractors

  Large-scale systems extract compost in 10-30 minutes with high-flow water movement and fine filtration. Target at least 1 lb compost per gallon of water. 

Dilute to the degree necessary for your application equipment and scale as long as a minimum of 50 gal/ac is applied.

• Sprayers & Irrigation 

  While compost extract is already filtered to 400-microns (40 mesh), in some cases it is necessary to filter down to 300-microns (50 mesh) or less to prevent clogging or to use larger orifice, higher output tips with a sprayer. Many sprayers will have internal/inline filters in which micron or mesh size needs to be verified. Filter as little as possible to avoid filtering out nematodes and filamentous organisms. Always flush tanks, hoses, and irrigation lines with fresh water following compost extract application. Sanitize periodically to prevent biofilm. 

• For Use With
  Backpack & Boom Sprayers, Venturi Injectors & Injection Pumps, Drip Irrigation, Overhead & Center Pivot Irrigation

Standard

40 gallons/acre, 3-4 times per season

Intensive

200+ gallons/acre as frequently as every other week

Timing

• Fall: Over crop residues, manure, or compost for decomposition and soil conditioning

• Spring: With microbial foods to boost soil microbiology

• Seasonal: Tank-mix with nutrients (low salt for microbial safety)

Apply within hours of preparation, especially if microbial foods are added.

Tank-mixed nutrients and minerals should be added before extraction to avoid strong concentration plumes.

Compatible inoculants (e.g., mycorrhizal fungi, PGPR, PSB) can be added at any stage.

Integrating Extract into Regenerative Agriculture

Success depends on:

• Addressing soil compaction, organic matter, and mineral balance.

• Using cover crops, crop residues, and compost applications.

• Implementing a comprehensive soil fertility program.