NewOctober 2026 release: John Deere sync redesign, rate min and max limits, yield report zones

Soil sampling requirements in Wyoming

Soil sampling requirements in Wyoming

State guidance: University of Wyoming Extension, Nutrient Management Guidelines for Dry Beans.

Soil sampling in Wyoming: frequency, area, depth and cores

When in the year should soil be sampled in Wyoming?

How many acres can one soil sample cover in Wyoming?

How deep should soil samples be taken in Wyoming?

How many cores go into one soil sample in Wyoming?

How many soil samples does a 100-acre field need in Wyoming?

University of Wyoming Extension, Nutrient Management Guidelines for Dry Beans: A uniform 100-acre field needs at least 3 composite samples of no more than 40 acres each, and at least 45 cores in all, 15 per sample.

Samples and cores for any field size

Soil sampling rules in Wyoming, with the exact wording of each source
Country / region Purpose / programme Time / frequency Area per sample Method Depth Cores Status and source
United States
WyomingUnited StatesWyoming only. Other states set their own rules.Pre-plant soil sampling for dry beans onlyUniversity of Wyoming Extension, Nutrient Management Guidelines for Dry Beans
  • Season Before planting. Sample at the same time of year each time.
Typical approach: one composite from a 20 to 40 acre field (8.09 to 16.19 ha)Not specifiedTillage zone, usually 6 or 8 inches (15.24 or 20.32 cm), for pH, organic matter, N, P, K and micronutrients. For nitrate, a 12 inch (30.48 cm) core split into 0 to 6 and 6 to 12 inches, unless tillage mixes the soil to one foot.15 to 20 random locationsOfficial guidanceUniversity of Wyoming Extension B-1016R (PDF)
Who it applies to, the exact wording and every source
Who it applies to
Advice from the public land-grant university extension service for Wyoming, written for dry bean fields only (its fertilizer tables are for irrigated dry beans). Not other crops. Not law.
In force from
Under review
Legal text
University of Wyoming Cooperative Extension Service B-1016R, Nutrient Management Guidelines for Dry Beans (June 2005)

The wording in the source

Timing

  • Before planting occurs, a representative soil sample should be collected from the tillage zone (usually a 6 or 8 inch depth)

    B-1016R p. 1

  • For best results, always collect samples at the same time of the year.

    B-1016R, Potassium

Area per sample

  • A typical sampling approach is to extract a 12-inch soil core from 15 to 20 random locations within a 20- to 40-acre field.

    B-1016R p. 1

Depth

  • Before planting occurs, a representative soil sample should be collected from the tillage zone (usually a 6 or 8 inch depth) for determination of pH, organic matter, available nitrogen, phosphorus, potassium, and micro-

    B-1016R p. 1

  • Nitrogen recommendations are more reliable when based on available nitrogen (nitrate-N) to a depth of 12 inches.

    B-1016R p. 1

  • Divide each core into two 6-inch sections, placing all top sections into one container and all bottom sections into another

    B-1016R p. 1

  • If tillage operations thoroughly mix soil to a depth of one foot, it is not necessary to separate the surface and subsurface layers.

    B-1016R p. 1

Cores

  • A typical sampling approach is to extract a 12-inch soil core from 15 to 20 random locations within a 20- to 40-acre field.

    B-1016R p. 1

Sources

Sources re-checked every two months, last update October 2026. Reviewed by GeoPard editorial team.

United States: federal rules and every other state

Soil sampling regulations in every country

Report an outdated requirement: info@geopard.tech

Plan the points to the rule that applies

Set the area per sample, the cores and the depth your rule asks for. GeoPard places the points on a grid or by zone, routes the walk, prints the labels and takes the plan to the field on a phone.

Create a sampling plan See the Soil Sampling Planner

A planning reference built from official sources, not legal advice. Rules apply by jurisdiction, nutrient, land use and programme: check the current official text and your laboratory’s instructions before fieldwork.

wpChatIcon
wpChatIcon

    Request Free GeoPard Demo / Consultation








    By clicking the button you agree our Privacy Policy. We need it to reply to your request.

      Subscribe


      By clicking the button you agree our Privacy Policy

        Send us information


        By clicking the button you agree our Privacy Policy

        We use cookies to provide you with the best browsing experience, personalise content of our site, analyse its traffic and show you relevant ads.
        See our privacy policy for more information.

        Accept all