What it does

Tell Compost Atlas where the field is, give it your compost lab report, and say how much you're spreading. It pulls the live USDA soil profile for that location, blends it with the compost, and shows what becomes plant-available over the first 90 days.

What you get back

What the soil looks like today, before any compost goes on.
What it looks like after the compost is tilled in.
How many pounds of each nutrient (N, P, K, etc.) the compost will release in the first 90 days — plus the multi-year residual through Years 2 and 3.
How that 90-day delivery compares to what your crop actually needs over the same window.
The fertilizer-equivalent dollar value of those Year-1 nutrients (per acre and per ton) — and the option to compare two composts head-to-head at the same site, rate, and crop.

Where the numbers come from

USDA soil data (SSURGO), the standard compost-lab method panel (TMECC), and published university and federal crop-nutrient guides — see the Sources page for the full list.

This is a planning tool, not a prescription. Final decisions belong with a qualified agronomist who knows your operation.