1. Bacteria Approximately 300-3,000 lbs/acre
Perform nutrient cycling, disease suppression, improve water holding capacity

2. Fungi Approximately 500-5,000 lbs/acre
Increase plant surface area for nutrient uptake
Drought tolerant
Leak glomalin

3. Protozoa Approximately 5-200 lbs/acre
Make nitrogen available to plants by eating bacteria
Rely on water films
Sand
Protozoa
Bacteria

4. Nematodes Approximately 1-100 lbs/acre
Nutrient cycling by eating other nematodes, protozoa, bacteria, and fungi
Up to 100/t in Ag soils or /t in grassland soils

5. Arthropods Shred organic material Stimulate microbial activity
Excrete plant available nutrients
Enhance soil aggregation
Control pests
Oribatid Turtle Mite
Sowbug

6. Earthworms Approximately 10-1,000 lbs/acre Alter soil structure
Water movement
Nutrient dynamics