This webpage from NSW Department of Primary Industries contains links to factsheets with introductory information about a range of soil biology topics. #
Topics:
How to conduct your own field trials
How to encourage soil organisms
Fumigation, inoculation and disease suppression
Microbes and minerals
Nematodes
How to build organic matter in your soil
Soil bacteria
Soil biology testing
Soil fungi
Questions to ask about soil biology products
The rhizosphere