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Krav på jordprovtagning i Iowa

Krav på jordprovtagning i Iowa

Statliga regler: Iowa Administrative Code 567, kapitel 65 (Djurutfodring). Statliga riktlinjer: Råd om jordprovtagning från Iowa State University Extension and Outreach.

Jordprovtagning i Iowa: frekvens, area, djup och kärnprovtagning

Hur ofta behöver man ta jordprover i Iowa?

När på året bör jordprover tas i Iowa?

Hur många hektar kan ett jordprov täcka i Iowa?

Hur djupt bör jordprover tas i Iowa?

Hur många kärnor går det till ett jordprov i Iowa?

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

Iowa DNR manure management plans (MMP) for confinement feeding operations: Ett enhetligt fält på 100 hektar behöver minst 10 sammansatta prover på högst 10 hektar vardera, och minst 100 kärnor totalt, 10 per prov.

Prover och kärnor för alla fältstorlekar

Soil sampling rules in Iowa, with the exact wording of each source
Country / region Purpose / programme Time / frequency Area per sample Method Depth Cores Status and source
United States
IowaUnited StatesIowa only. Other states set their own rules.Soil phosphorus and pH tests for the phosphorus indexIowa DNR manure management plans (MMP) for confinement feeding operations
  • Result valid Soil samples must be four years old or less
  • Repeat A complete plan with new soil sampling for each field at least once every four years
No more than 10 acres per sample. One sample for a field of 15 acres or less. Up to 20 acres for the next sampling where manure went on at phosphorus-based rates.Grid, management zone or soil type sampling, among others. Procedural details may be taken from ISU Extension CROP 31-8 (published as CROP 3108), NCR-13 Report 348 or other credible soil sampling publications.0 to 6 inchesAt least 10 cores per composite sampleConditionalIowa Administrative Code 567, Chapter 65 (PDF, IAC 8/6/25)
Who it applies to, the exact wording and every source
Who it applies to
Anyone who must submit a manure management plan for a confinement feeding operation: construction permit applicants, owners of operations built or expanded after May 31, 1985 or building a manure storage structure, and people applying manure in Iowa from out-of-state confinement operations. Covers each field in the plan, the fields where the phosphorus index must be used.
Outside the rule
Small animal feeding operations (SAFO, 500 or fewer animal units), operations of 500 or fewer animal units that elect SAFO status for updated plans, construction permit applicants for an egg washwater storage structure, and research colleges for their research activities.
Laboratory and analysis
Phosphorus and pH. A laboratory enrolled in the IDALS soil testing certification program. Bray-1 phosphorus not accepted where soil pH is 7.4 or higher.
In force from
Under review
Legal text
Iowa Administrative Code 567, Chapter 65 (Animal Feeding Operations), Rule 567-65.111(11) and 65.111(12)

The wording in the source

Timing

  • Soil samples shall be obtained from each field in the MMP, and the soil samples shall be four years old or less.

    567 IAC 65.111(11)

  • An operation must submit a complete MMP using a new phosphorus index, including soil sampling as required in subrule 65.111(11), for each field in the MMP a minimum of once every four years.

    567 IAC 65.111(12)"h"(3)

Area per sample

  • Each soil sample shall represent no more than ten acres. For fields less than or equal to 15 acres, only one soil sample is necessary.

    567 IAC 65.111(11)"c"

  • If manure is applied as phosphorus-based rates within soil sampling periods, each soil sample may represent up to 20 acres for the next required soil sampling.

    567 IAC 65.111(11)"f"

Method

  • Acceptable soil sampling strategies include but are not limited to grid sampling, management zone sampling, and soil type sampling.

    567 IAC 65.111(11)"a"

  • Procedural details can be taken from Iowa State University Extension and Outreach publication CROP 31-8, “Take a Good Soil Sample to Help Make Good Fertilization Decisions,” NCR-13 Report 348, “Soil Sampling for Variable-Rate Fertilizer and Lime Application,” effective January 1, 2001, or other credible soil sampling publications.

    567 IAC 65.111(11)"a"

Depth

Cores

  • Each soil sample must be a composite of at least ten soil cores from the sampling area, with each core containing soil from the top six inches of the soil profile.

    567 IAC 65.111(11)"b"

Who it applies to

  • Soil sampling requirements for fields where the phosphorus index must be used. Soil samples shall be obtained from each field in the MMP

    567 IAC 65.111(11), heading

  • An applicant for a construction permit for a confinement feeding operation.

    567 IAC 65.110(1)"a"

  • The owner of a confinement feeding operation, other than a SAFO, if one of the following applies:

    567 IAC 65.110(1)"b"

  • The owner constructs a manure storage structure, regardless of whether the person is required to be issued a permit for the construction

    567 IAC 65.110(1)"b"(2)

  • A person who applies manure in Iowa that was produced in a confinement feeding operation, other than a small operation, located outside of Iowa.

    567 IAC 65.110(1)"c"

  • The confinement feeding operation was constructed or expanded after May 31, 1985, regardless of whether the confinement feeding operation structure was required to have a construction permit.

    567 IAC 65.110(1)"b"(1)

  • A person who submits an MMP shall include a phosphorus index as part of the MMP as required in subrule 65.111(12).

    567 IAC 65.111(1)"c"

Outside the rule

  • “Small AFO” or “SAFO” means an AFO that has an animal unit capacity of 500 or fewer animal units.

    567 IAC 65.1, definitions

  • However, an MMP shall not be required of an applicant for an egg washwater storage structure or for a SAFO.

    567 IAC 65.110(1)"a"

  • An AFO otherwise required to submit an updated MMP and pay an annual compliance fee may make an election to be considered a SAFO for purposes of filing updated MMPs and annual compliance fees if the confinement feeding operation maintains an animal unit capacity of 500 or fewer animal units.

    567 IAC 65.110(1)"e"(2)

  • A research college is exempt from this subrule and the MMP requirements of rule … for research activities and experiments performed under the authority of the research college and related to confinement feeding operations.

    567 IAC 65.110(1)"e"(1)

Laboratory and analysis

  • Each soil sample shall be analyzed for phosphorus and pH.

    567 IAC 65.111(11)

  • Soil analysis must be performed by a lab enrolled in the Iowa department of agriculture and land stewardship (IDALS) soil testing certification program.

    567 IAC 65.111(11)"d"

  • If soil pH is greater than or equal to 7.4, soil phosphorus data from the Bray-1 extraction method is not acceptable for use with the phosphorus index.

    567 IAC 65.111(11)"e"

Sources

Sources re-checked every two months, last update October 2026. Reviewed by GeoPard editorial team.
IowaUnited StatesIowa only. Other states set their own rules.Routine soil fertility samplingIowa State University Extension and Outreach soil sampling advice
  • Repeat Every 2 to 4 years for most crops, or once in a crop rotation, in the same crop each time
  • Season Ideally after harvest and before fertilization. Not shortly after lime, fertilizer or manure. Avoid winter and frozen soil.
Grid: a suggested minimum of one sample per 2.5 acres. Beyond that, zone sampling is likely more effective. Otherwise one sample per uniform area.Soil map unit or management zone sampling, or grid sampling. Cores in a random zigzag pattern across each area; grid points cover an area at least 50 feet across.P, K, Zn and organic matter: 0 to 6 inches in all tillage systems. pH: 0 to 6 inches with tillage, top 2 to 3 inches in no-till and in hay or pasture.At least 10 to 12 cores per sample. 15 to 20 for a better average. At least 20 with recent banded fertilizer or manure.Official guidanceISU Extension and Outreach CROP 3108 (PDF, copy hosted by Iowa DNR)
Who it applies to, the exact wording and every source
Who it applies to
Advice for Iowa fields from Iowa State University Extension and Outreach. Not law. Iowa manure management rules point to it for procedure.
Laboratory and analysis
Tell the laboratory when the pH sample came from 2 to 3 inches or the lime will not be incorporated.
Field identifiers
Each bag identifies the field and sample area with a unique number.
In force from
Under review
Legal text
ISU Extension and Outreach CROP 3108, Take a Good Soil Sample to Help Make Good Fertilization Decisions (December 2016)

The wording in the source

Timing

Area per sample

Method

Depth

Cores

Laboratory and analysis

  • In these tillage and cropping conditions the laboratory must be informed that the sample was taken from a depth of 2-3 inches or that the lime will not be incorporated.

    CROP 3108, Sampling depth, p. 4

Field identifiers

Sources

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

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