新しい2026年10月リリース予定: ジョンディア同期システムの再設計、レートの最小値と最大値の制限、収量レポートゾーン

ノースダコタ州における土壌サンプリングの要件

ノースダコタ州における土壌サンプリングの要件

州の指針:ノースダコタ州立大学普及局によるサンプリングに関する助言。.

ノースダコタ州における土壌サンプリング:頻度、面積、深度、コア採取

ノースダコタ州では、土壌サンプルを採取するのに最適な時期はいつですか?

ノースダコタ州では、1つの土壌サンプルで何エーカーの範囲をカバーできますか?

  • 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.

ノースダコタ州では、土壌サンプルはどのくらいの深さまで採取すべきですか?

  • 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.

ノースダコタ州では、1つの土壌サンプルを採取するのに何本のコアが必要ですか?

ノースダコタ州で100エーカーの畑を耕作する場合、土壌サンプルはいくつ必要ですか?

NDSU Extension sampling advice: 均一な100エーカーの圃場を採取するには、それぞれ1エーカー以下の複合サンプルを少なくとも100個、合計で少なくとも800個のコアサンプル(1サンプルあたり8個)が必要となる。.

あらゆるフィールドサイズに対応するサンプルとコア

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.

アメリカ合衆国:連邦規則およびその他のすべての州

各国の土壌サンプリング規制

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