I have tested my soil and have lost a lot of my worms, over too high of nitrate. How do I get it down?
Certified GKH Gardening Expert
If you are talking about soil in a box for vermicomposting, they you will need to add in other materials to reduce the nitrate. If this in soil in the ground, try planting a nitrogen heavy feeder like squash there to pull some of that out of the soil.