Soil amendments that actually work

soil · beginner · ~5 min read

Most amendment failure isn't the amendment — it's the rate and the timing. Below is what we actually use on a working farm, in order of how often we reach for it.

Compost (annual top-dress)

1–2 inches across the bed every fall. The single biggest thing you can do for any garden in any climate. Make your own or buy from a Utah composter who lists feedstocks.

Elemental sulfur

1 lb per 100 sq ft, worked into the top 6 inches. Lowers pH 0.5 unit over 4–8 months. Repeat applications needed for stubborn caliche soils.

Aged manure

0.5–1 inch in fall. Adds nitrogen and biology. Never use fresh — burns roots and may carry weed seed and pathogens.

Iron chelate

Foliar spray for emergency rescue when chlorosis appears mid-summer. Greens up plants in 3–5 days. Doesn't fix soil — pair with fall sulfur.

Gypsum

5 lb per 100 sq ft. Loosens clay-caliche soils. Does NOT lower pH. Use only when soil is mechanically tight.

Cover crops

Sow rye/vetch in September after the last harvest. Terminate in April by crimping. Adds organic matter, fixes nitrogen, suppresses weeds. Best long-term play.