Editorial standards

We would rather say less and be right. Every guide and tool on Soil Test by State follows these rules.

Sources we use

We rely on land-grant university soil testing laboratories, Cooperative Extension publications, state departments of agriculture, the USDA and the EPA.

We cite the primary source whenever one exists: the statute, the agency page, the court rule, or the extension publication. News articles and industry groups are used only for context and are labeled as such. Each guide lists its sources at the bottom with links.

What we will not do

• We do not invent statistics, testimonials, reviews, expert quotes, or credentials.
• We do not present estimates as measurements. Where a number is a rule of thumb or a model, the page says so and explains the math.
• We do not accept payment to include, rank, or recommend anything in our guides.
• We never ask readers to click ads, and ads are always labeled “Advertisement.”

Tools and data

The soil sampling planner follows common Cooperative Extension sampling instructions; your lab's form takes priority.

Review and updates

Each guide shows the date it was last reviewed. We re-check sources when we learn a rule has changed and at least once a year. When a change matters to readers, we note it on the page.

Corrections

If you find a mistake, use the contact form and include the page and a source. Confirmed errors are fixed promptly, and substantive corrections are noted on the page with the date.

Limits

Soil lab prices, forms and recommendations change and differ by state. Follow your lab's own sampling instructions. This site is general information, not agronomic or environmental advice.

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