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Krav på jordprovtagning i North Dakota

Krav på jordprovtagning i North Dakota

Statliga riktlinjer: NDSU Extension-råd om provtagning.

Jordprovtagning i North Dakota: frekvens, area, djup och kärnprovtagning

När på året bör jordprover tas i North Dakota?

Hur många hektar kan ett jordprov täcka i North Dakota?

  • NDSU Extension sampling advice Official guidance Where grid sampling is used: one sample per acre (0.40 ha). Coarser grids, such as one sample per 2.5 acres, are inadequate in North Dakota. The guide sets no area for zone samples.

Hur djupt bör jordprover tas i North Dakota?

  • NDSU Extension sampling advice Official guidance 0 to 6 inches (0 to 15.24 cm) for pH, P, K, Zn, Cu, Mn. 0 to 2 feet (0 to 60.96 cm) for nitrate-N and chloride, best split at 6 inches. No-till: 0 to 2 inches (0 to 5.08 cm) separately from 2 to 6 inches.

Hur många kärnor går det till ett jordprov i North Dakota?

Hur många jordprover behövs för ett 40 hektar stort fält i North Dakota?

NDSU Extension sampling advice: Ett enhetligt fält på 100 hektar behöver minst 100 sammansatta prover på högst 1 hektar vardera, och minst 800 kärnor totalt, 8 per prov.

Prover och kärnor för alla fältstorlekar

Soil sampling rules in North Dakota, with the exact wording of each source
Country / region Purpose / programme Time / frequency Area per sample Method Depth Cores Status and source
United States
North DakotaUnited StatesNorth Dakota only. Other states set their own rules.Soil sampling for fertilizer recommendations, including nitrateNDSU Extension sampling advice
  • Season Nitrate samples may be taken right after any grain harvest. Sample for K at the same time each year.
Where grid sampling is used: one sample per acre (0.40 ha). Coarser grids, such as one sample per 2.5 acres, are inadequate in North Dakota. The guide sets no area for zone samples.Zone sampling, with zones built from at least two tools such as crop canopy imagery, soil EC sensors, multiyear yield maps and elevation. A systematic unaligned grid only in areas with large manure applications or fields with large P and K buildup applications.0 to 6 inches (0 to 15.24 cm) for pH, P, K, Zn, Cu, Mn. 0 to 2 feet (0 to 60.96 cm) for nitrate-N and chloride, best split at 6 inches. No-till: 0 to 2 inches (0 to 5.08 cm) separately from 2 to 6 inches.Eight to 10 cores at random within each zoneOfficial guidanceNDSU Extension, SF990 Soil Sampling as a Basis for Fertilizer Application
Who it applies to, the exact wording and every source
Who it applies to
Advice for North Dakota fields from North Dakota State University Extension. Not law.
In force from
Under review
Legal text
NDSU Extension, Soil Sampling as a Basis for Fertilizer Application (SF990, revised September 2023)

The wording in the source

Timing

Area per sample

Method

  • Grid sampling is recommended in North Dakota only in areas with large manure applications or in fields that have received large amounts of buildup P and K fertilizers.

    SF990, Sampling for Within-field Soil Test Values

  • Zones should be developed using at least two tools (Franzen et al., 2011).

    SF990, Zone Sampling

  • Aerial imagery from piloted aircraft or drones … satellite imagery of growing crops … soil electrical conductivity sensors … multiyear yield maps … topography developed from subinch accuracy GPS elevation … may be used to help develop zones for use in soil sampling.

    SF990, Zone Sampling

  • The pattern of grid sampling should be a systematic, unaligned grid as illustrated in Figure 7.

    SF990, Sampling for Within-field Soil Test Values

Depth

  • For soil pH, P, K, Zn, copper (Cu) and manganese (Mn), sampling the 0- to 6-inch depth is required because that is the depth of sampling related to crop response in this region.

    SF990, Depth of Sampling, Nutrients

  • For soil nitrate-N and chloride, a 0- to 2-foot core is required. Instead of analyzing just one 0- to 2-foot core, dividing the core into a 0- to 6-inch core and a 6- to 24-inch core, and analyzing each one separately would be instructive.

    SF990, Depth of Sampling, Nutrients

  • Therefore, in fields under no-till systems, the 0- to 2-inch depth should be separated and analyzed separately for soil pH, P and K in addition to analyzing soil at the 2- to 6-inch depth.

    SF990, Tillage System

Cores

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

Rapportera ett föråldrat krav: info@geopard.tech

Planera punkterna enligt den regel som gäller

Ställ in arean per prov, kärnorna och det djup som din regel begär. GeoPard placerar punkterna i ett rutnät eller per zon, ruter promenaden, skriver ut etiketterna och tar med sig planen till fältet på en telefon.

Skapa en provtagningsplan Se jordprovtagningsplaneraren

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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