Your state’s guides
Sigma programs are timed by growth stage, so they travel. Your state extension service tells you what your soil needs and when those stages arrive where you farm.
Every state
Find your state’s recommendations
Every state has a land-grant university that publishes free, research-based advice for its own soils and climate. Pick your state to get its soil lab, fertilizer recommendations and planting calendar.
Select your state to see its soil test lab, fertilizer recommendations, vegetable guide and planting calendar.
Across the country
Regional handbooks and national tools
Multi-state guides written by the land-grant universities in each region.
Know a guide we should add, or farm somewhere we haven’t covered? Tell us and we’ll add it.