What are some tips for enrichment of soil?
How to Enrich Soil Before Plantation/Sowing
Certified GKH Gardening Expert
These articles will help you:
First thing I would suggest is get a soil test, otherwise you are shooting in the dark. Depending on where you live, most states have a very low cost sampling program. Without knowing what type of soil, PH, Acidity level, sodium level, etc. you would be guessing.