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Krav på jordprovtagning i Montana

Krav på jordprovtagning i Montana

Statliga riktlinjer: Råd om jordprovtagning från Montana State University Extension.

Jordprovtagning i Montana: frekvens, area, djup och kärnprovtagning

När på året bör jordprover tas i Montana?

Hur djupt bör jordprover tas i Montana?

Hur många kärnor går det till ett jordprov i Montana?

Soil sampling rules in Montana, with the exact wording of each source
Country / region Purpose / programme Time / frequency Area per sample Method Depth Cores Status and source
United States
MontanaUnited StatesMontana only. Other states set their own rules.Routine soil fertility samplingMontana State University Extension soil sampling advice
  • Season Late fall to mid-spring for nitrogen. If sampled in fall above about 60 lb N/acre on soils under two feet deep, sample again in spring.
Not specifiedGrid for immobile nutrients, manure or high fertilizer history, or merged fields; zones for nitrogen, organic matter and pH, unknown history or yield linked to landscape. Uniform fields sampled at random. Georeference sampling points and return to them.Annual crops: 6 inches for most tests, at least 2 feet for nitrogen. Pasture and forage: 12 inches.Ten subsamples per composite is a reasonable average; 12 per field or zone for plus or minus 25 percent accuracy at 90 percent confidence.Official guidanceMSU Extension, The Soil Scoop: Soil Testing, Getting a Good Sample (PDF)
Who it applies to, the exact wording and every source
Who it applies to
Advice for Montana fields from Montana State University Extension. Not law.
Laboratory and analysis
Olsen phosphorus test, the basis of Montana P guidelines. Ask whether the lab is enrolled in a proficiency testing program; stay with a reliable lab in later years.
Field identifiers
Georeference sampling points with GPS; keep records of sampling locations and timing.
In force from
Under review
Legal text
MSU Extension, The Soil Scoop: Soil Testing, Getting a Good Sample (September 2025), and MontGuide MT200803AG, Soil Sampling Strategies (revised September 2017)

The wording in the source

Timing

  • Therefore, sampling in late fall to mid-spring is recommended to best capture growing season N availability.

    Soil Scoop, Timing

  • If fall nitrate levels are very high (e.g., greater than about 60 lb N/acre) and soil depth is less than two feet, a second sampling in spring is strongly suggested because there is a high likelihood of overwinter nitrate losses.

    Soil Scoop, Timing

Method

  • Grid sampling is good for fields with a history of manure or high fertilizer levels (especially P and K), and small fields merged to form a larger field.

    Soil Scoop, Location

  • Zone based sampling is suggested for fields with unknown or long cropping history, historically low levels of fertilization, no manure applications, and high with-in field variability or a relationship of yield to landscape.

    Soil Scoop, Location

  • Uniform fields can be randomly sampled throughout the entire field.

    MontGuide MT200803AG, Random Sampling

  • All sampling points should be georeferenced with a global positioning system (GPS) receiver and sampled in the same locations in subsequent years to track soil nutrient variation in a field, to see long-term trends, and to guide fertilizer application location.

    MontGuide MT200803AG, Types of Sampling

Depth

  • Pasture and forage get sampled to 12-inch depth, and annual crops to 6-inch for most characteristics and at least to 2-foot depth for N.

    Soil Scoop, Depth

Cores

  • Ten subsamples per composite sample is a reasonable average. More subsamples require more time, but improve accuracy.

    Soil Scoop, Number

  • if an accuracy level of ± 25% is deemed sufficient at a 90% confidence, then 12 subsamples per field (or zone) should be collected, composited and analyzed for nitrogen, phosphorus, and potassium.

    MontGuide MT200803AG, Number of Subsamples

Laboratory and analysis

  • For example, soil P levels in Montana soils are best tested with the Olsen rather than Bray or Mehlich tests, which are not suitable for soil pH greater than 6.

    Soil Scoop, Lab Selection

  • Also, Montana’s P fertilization guidelines are based on Olsen P values.

    Soil Scoop, Lab Selection

  • Ask if the lab is enrolled in a ‘proficiency’ testing program.

    Soil Scoop, Lab Selection

  • If a lab is reliable, stay with the same lab in subsequent years, because soil test results and recommendations can vary greatly among labs.

    Soil Scoop, Lab Selection

Field identifiers

Sources

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

USA: federala regler och alla andra delstater

Jordprovtagningsregler i alla länder

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Planera punkterna enligt den regel som gäller

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En planeringsreferens byggd på officiella källor, inte juridisk rådgivning. Regler gäller beroende på jurisdiktion, näringsämne, markanvändning och program: kontrollera den aktuella officiella texten och ditt laboratoriums instruktioner före fältarbete.

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