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Here at OASCO, we do a LOT of in-house testing of materials we provide. This is primariliy microscope tests for compost materials, worm castings, insect frass, and compost tea blends.
We also outsource testing, primarily for third-party confirmation of in-house analysis.
We recommend the following labs for soil testing, compost tea testing, and related services:
Note that many USDA Extension Offices are now starting to provide biological testing. Be sure to check with your local extension office to see if they provide good biological testing services.