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Zahteve za vzorčenje tal v Missouriju

Zahteve za vzorčenje tal v Missouriju

Državne smernice: Tehnični standard za upravljanje hranil Missouri DNR CAFO in nasveti za vzorčenje tal Univerze v Missouriju.

Vzorčenje tal v Missouriju: pogostost, površina, globina in vzorci

Kako pogosto je treba vzorčiti zemljo v Missouriju?

Kdaj v letu je treba vzorčiti zemljo v Missouriju?

  • University of Missouri Extension soil sampling advice Official guidance When the field is idle: fall and winter after harvest for forages and spring crops; summer for winter wheat and fall-seeded crops. At least three months after phosphorus fertilizer, lime or manure.

Koliko hektarjev lahko pokrije en vzorec tal v Missouriju?

Kako globoko je treba odvzeti vzorce tal v Missouriju?

Koliko jeder gre v en vzorec tal v Missouriju?

Koliko vzorcev tal potrebuje 100-akrsko polje v Missouriju?

Missouri DNR CAFO Nutrient Management Technical Standard: Za enotno 40-akrsko polje je potrebnih vsaj 5 sestavljenih vzorcev, vsak s površino največ 7 hektarjev, in vsaj 75 jeder skupaj, 15 na vzorec.

Vzorci in jedra za polja vseh velikosti

Soil sampling rules in Missouri, with the exact wording of each source
Country / region Purpose / programme Time / frequency Area per sample Method Depth Cores Status and source
United States
MissouriUnited StatesMissouri only. Other states set their own rules.Current soil test results for CAFO manure applicationMissouri DNR CAFO Nutrient Management Technical Standard
  • Result valid Re-sample before manure application when the soil test is more than five years old, or the phosphate surplus since the last test exceeds 500 lb/acre
Approximately 20 acres or less per sample. Grid alternative: cells under 3 acres.Per MU Guides G9215 (pastures) and G9217 (row and hay crops). Georeferenced grid sampling is an alternative.6 to 8 inchesAt least 15 representative cores per sample, more on pastures or where phosphorus was banded. Grid: at least 10 cores within 15 feet of the grid point.Official guidanceMissouri DNR CAFO Nutrient Management Technical Standard, March 4, 2009 (PDF, copy in the MU CAFO operator curriculum)
Who it applies to, the exact wording and every source
Who it applies to
Missouri DNR technical standard (March 4, 2009) for land application fields in the nutrient management plans of Class I CAFOs. Compliance is how a CAFO shows a precipitation-related discharge qualifies as agricultural stormwater. A department standard, not the regulation text.
Laboratory and analysis
A laboratory accredited by the Missouri Soil Testing Association, using University of Missouri Soil Testing Laboratory procedures.
In force from
Under review
Legal text
Missouri Concentrated Animal Feeding Operation Nutrient Management Technical Standard (Missouri DNR, March 4, 2009), Section III, A1(1)

The wording in the source

Timing

  • Fields should be re-sampled before manure application when:

    NMTS, III A1(1)f

  • The soil test is greater than five years old; or

    NMTS, III A1(1)f.i

  • Phosphate surplus (actual applied phosphate minus actual removed phosphate) for the field has exceeded 500 lbs/acre since the last soil test;

    NMTS, III A1(1)f.ii

Area per sample

  • The average field area represented by a soil sample should be approximately 20 acres or less;

    NMTS, III A1(1)b

  • Grid size should be less than three acres and at least 10 cores should be obtained from within 15 feet of the central grid point;

    NMTS, III A1(1)d

Method

  • MU Guides G9215 (for pastures) and G9217 (for row and hay crops);

    NMTS, III A1(1)a

  • operations may elect to use a geo-referenced grid soil sampling method instead.

    NMTS, III A1(1)d

Depth

Cores

  • Each soil sample should be comprised of a well-mixed subsample derived from at least 15 representative cores from the sampled field area; more cores are recommended on pastures or where phosphorus has been band applied;

    NMTS, III A1(1)c

  • Grid size should be less than three acres and at least 10 cores should be obtained from within 15 feet of the central grid point;

    NMTS, III A1(1)d

Who it applies to

  • The department’s CAFO regulations require the development and implementation of a field specific Nutrient Management Plan (NMP), meeting the criteria prescribed in 10 CSR 20-6.300(5)(A)-(I), at all Class I CAFOs.

    NMTS, I.A Authority and Purpose

  • CAFOs will qualify for the Agriculture Stormwater Discharge exemption when they can demonstrate compliance with this NMTS at the time of a precipitation-related discharge from land application areas.

    NMTS, I.A Authority and Purpose

Laboratory and analysis

  • Soil samples should be analyzed at soil testing laboratories accredited by the Missouri Soil Testing Association

    NMTS, III A1(1)g

  • using procedures recommended by the University of Missouri Soil Testing Laboratory.

    NMTS, III A1(1)g

Sources

Sources re-checked every two months, last update October 2026. Reviewed by GeoPard editorial team.
MissouriUnited StatesMissouri only. Other states set their own rules.Routine soil fertility sampling, hayfields and row cropsUniversity of Missouri Extension soil sampling advice
  • Repeat Every three to five years, at the same time of year as the last sample
  • Season When the field is idle: fall and winter after harvest for forages and spring crops; summer for winter wheat and fall-seeded crops
  • Wait At least three months after phosphorus fertilizer, lime or manure
Sampling areas typically no more than 20 acres. Grid sampling: typically one sample per 2.5 acres or less.Divide fields into areas expected to be similar or managed alike; zigzag across the whole area. Grid sampling for variable rate, high-value fields or unknown history.6 to 7 inches for most objectives. Long-term no-till: a separate 0 to 2 inch sample for surface pH.10 to 20 cores. 15 to 20 with manure, banded fertilizer or other variation; 10 to 15 on uniform, broadcast-fertilized fields. 30 cores in a set pattern where injection bands are known.Official guidanceMU Extension G9217, Soil Sampling Hayfields and Row Crops (PDF, CAFO operator curriculum copy)
Who it applies to, the exact wording and every source
Who it applies to
Advice for Missouri hayfields and row crops from University of Missouri Extension. Not law.
Laboratory and analysis
A laboratory accredited by the Missouri Soil Testing Association (MSTA).
Field identifiers
Label each sample with field and subfield names.
In force from
Under review
Legal text
MU Extension Guide G9217, Soil Sampling Hayfields and Row Crops

The wording in the source

Timing

  • Sample your fields every three to five years. It is also recommended that you sample a field at the same time of year as your last sample because some soil test levels fluctuate during the year.

    G9217, When should I sample?

  • It is best to wait at least three months after application of phosphorus fertilizer, lime or manure before taking a soil sample.

    G9217, When should I sample?

  • The best time to collect soil samples is when the field is idle and enough time is available to plan fertilizer and lime applications for the next crop.

    G9217, When should I sample?

  • Sampling after harvest in the fall and winter usually works best for forages and spring-seeded crops.

    G9217, When should I sample?

  • For winter wheat and fall-seeded crops, sampling while the field is idle in the summer works well.

    G9217, When should I sample?

Area per sample

Method

  • When creating a soil-sampling plan for fields and farms, the objective is to divide fields into areas that you expect to have similar characteristics or you are likely to manage similarly.

    G9217, How should I divide my fields?

  • The best approach is to travel across the entire area to be sampled in a zigzag pattern randomly selecting spots to take a core (Figure 1).

    G9217, How to collect a soil sample

  • This method of sampling is typically used when a farmer uses variable rate technology to apply fertilizers or lime.

    G9217, Should I grid sample my field?

  • Grid sampling is most justified on high value and high yielding soils, particularly when you anticipate significant variations in soil test levels including low testing areas within a field. It can also be useful the first time you sample the soil in a field with an unknown history.

    G9217, Should I grid sample my field?

Depth

Cores

Laboratory and analysis

Field identifiers

Sources

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

Združene države: zvezna pravila in pravila vseh drugih držav

Predpisi o vzorčenju tal v vsaki državi

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