Choose several subsample areas that are fairly indicative of the rest of the soil in your growing space. Dig 5-10 subsamples 4" down if you're just testing for pH, 6" down if you're testing for pH ...
Various organic matter sources can be used to enhance soil health. Common options include compost, aged leaves, well-rotted hay or silage, peat moss, composted manure, green cover crops, and untreated ...