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Soil sampling requirements in Idaho

Soil sampling requirements in Idaho

State rules: IDAPA 02.04.30, Rules Governing Environmental and Nutrient Management (Idaho Department of Agriculture). State guidance: University of Idaho Extension, soil testing advice.

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

How often do you need to soil sample in Idaho?

How deep should soil samples be taken in Idaho?

How many cores go into one soil sample in Idaho?

Soil sampling rules in Idaho, with the exact wording of each source
Country / region Purpose / programme Time / frequency Area per sample Method Depth Cores Status and source
United States
IdahoUnited StatesIdaho only. Other states set their own rules.Annual soil samples on fields that receive livestock wasteIdaho State Department of Agriculture, Environmental and Nutrient Management rules
  • Repeat Every year, on all fields that received livestock waste, manure or process wastewater from the operation
Not specifiedRepresentative samples taken by a Certified Soil Sampler using the methods of University of Idaho Soil Sampling Bulletin 704 (revised August 1997), incorporated by reference.Not specifiedNot specifiedConditionalIDAPA 02.04.30 (PDF, Idaho Office of the Administrative Rules Coordinator)
Who it applies to, the exact wording and every source
Who it applies to
Facilities required to keep a nutrient management plan: licensed dairies, beef cattle feeding operations and poultry operations required to have an NMP, and commercial truck wash operations, on every field where their livestock waste, manure or process wastewater was land applied.
Laboratory and analysis
An approved laboratory: one with valid certification from the North American Proficiency Testing Program under the Soil Science Society of America.
Field identifiers
Where an alternate depth is used for resource concerns, the sampler marks the depth on every sample and lab submission form.
In force from
Under review
Legal text
IDAPA 02.04.30, Rules Governing Environmental and Nutrient Management (Idaho Department of Agriculture), Sections 150, 151, 152, 104 and 110

The wording in the source

Timing

  • Facilities required to maintain an NMP, pursuant to these rules, must have soil samples collected each year from all fields owned or operated by the dairy, beef, poultry, or commercial truck wash operation to which livestock waste, manure, or process wastewater from the operation was land applied.

    Section 150, Soil Samples

Method

  • All soil samples collected pursuant to this chapter must be representative samples that are collected by a CSS at the depth indicated by the approved NMP for each facility. Samples shall be collected pursuant to SSB approved methods and submitted to an approved laboratory.

    Section 151, Soil Sample Collection

  • August 1997 University of Idaho, Soil Sampling Bulletin 704 (revised).

    Section 104.01, Incorporation by Reference

  • All persons who collect soil samples pursuant to Subchapter A must be a certified soil sampler via the Department Certification Program.

    Section 152, Soil Sample Certification

Who it applies to

  • Facilities required to maintain an NMP, pursuant to these rules, must have soil samples collected each year from all fields owned or operated by the dairy, beef, poultry, or commercial truck wash operation to which livestock waste, manure, or process wastewater from the operation was land applied.

    Section 150

  • All dairy farms licensed to sell milk for human consumption, beef cattle feeding operations required to implement a Nutrient Management Plan (NMP), poultry operations required to implement an NMP, certified NMP planners and certified soil samplers.

    Rule summary, Who does this rule apply to?

Laboratory and analysis

  • Approved Laboratory. A soil testing laboratory with a valid certification from the North American Proficiency Testing Program under the auspices of the Soil Science Society of America.

    Section 110.01, Definitions

Field identifiers

  • If resource concerns require an alternate sampling depth be used, the CSS must indicate the alternate depths on all samples and lab submission forms.

    Section 151

Sources

Sources re-checked every two months, last update October 2026. Reviewed by GeoPard editorial team.
IdahoUnited StatesIdaho only. Other states set their own rules.Soil testing to guide fertilizer managementUniversity of Idaho Extension, soil testing advice
  • Repeat Every year for best results; at least once each crop rotation cycle
Not specifiedDivide each field into sampling units; take cores at random, meandering or zigzagging through each unit.Fit to crop rooting depth; most fertilizer guides are based on 2 ft. Beans and sugar beets 2 ft. Potatoes 1 ft. Wheat fields would benefit from sampling to 5 ft in 1 ft increments.By field size: under 5 acres 15; 5 to 10 acres 18; 10 to 25 acres 20; 25 to 50 acres 25; over 50 acres 30. Never fewer than 10.Official guidanceUniversity of Idaho Extension BUL 915 (PDF)
Who it applies to, the exact wording and every source
Who it applies to
Advice for Idaho fields from University of Idaho Extension. Not law.
In force from
Under review
Legal text
University of Idaho Extension BUL 915, Soil Testing to Guide Fertilizer Management (October 2023)

The wording in the source

Timing

  • For optimal soil fertility management, samples should be collected each year, and fields fertilized for a realistic potential yield of the intended crop.

    Sampling Frequency

  • It is recommended to collect soil samples at least once during each crop rotation cycle (Walworth 2011).

    Sampling Frequency

Method

Depth

  • With wheat rooting depth reaching up to 5 ft, it would be beneficial to sample wheat fields to 5 ft, in 1 ft increments.

    Sampling Technique, 4. Define sampling depth

  • Although most fertilizer guides are based on a 2 ft depth, the sampling depth should be tailored to crop-specific rooting depth for the most accurate recommendations. For beans and sugar beets, the soil samples are typically collected from 2 ft. For potatoes, 1 ft samples are appropriate, due to a shallower rooting depth.

    Sampling Technique, 4. Define sampling depth

Cores

  • Table 1, field size in acres and recommended number of samples: <5 15; 5–10 18; 10–25 20; 25–50 25; >50 30

    Table 1 (table, transcribed)

  • *An absolute minimum of 10 samples from each sampling unit is necessary to obtain an acceptable sample.

    Table 1 footnote

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.

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