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Zahteve za vzorčenje tal v Južni Dakoti

Zahteve za vzorčenje tal v Južni Dakoti

Državne smernice: Razširitev SDSU, Priporočene metode vzorčenja tal za Južno Dakoto.

Vzorčenje tal v Južni Dakoti: pogostost, površina, globina in vzorci

Kako pogosto je treba vzorčiti zemljo v Južni Dakoti?

Kdaj v letu je treba vzorčiti zemljo v Južni Dakoti?

Koliko hektarjev lahko pokrije en vzorec tal v Južni Dakoti?

Kako globoko je treba odvzeti vzorce tal v Južni Dakoti?

  • SDSU Extension, Recommended Soil Sampling Methods for South Dakota Official guidance 0 to 6 inches (0 to 15.24 cm) for P, K, pH, organic matter, soluble salts, zinc, iron, manganese, copper and boron. For mobile nutrients such as nitrate, chloride and sulfur, a 24 inch sample split into 0 to 6 and 6 to 24 inches (15.24 to 60.96 cm).

Koliko jeder gre v en vzorec tal v Južni Dakoti?

Koliko vzorcev tal potrebuje 100-akrsko polje v Južni Dakoti?

SDSU Extension, Recommended Soil Sampling Methods for South Dakota: Za enotno 40-akrsko polje je potrebnih vsaj 40 sestavljenih vzorcev, ki ne presegajo 2,5 akrov vsak, in vsaj 240 jeder skupaj, 6 na vzorec.

Vzorci in jedra za polja vseh velikosti

Soil sampling rules in South 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
South DakotaUnited StatesSouth Dakota only. Other states set their own rules.Routine soil fertility and nitrate samplingSDSU Extension, Recommended Soil Sampling Methods for South Dakota
  • Repeat P, K, pH, salts, Ca, Mg and micronutrients every 2 to 3 years. Nitrate every year before non-legume crops.
  • Season Mobile nutrients, nitrate in particular: late fall once soil is below 50 F, winter, or early spring. Most other tests any time of year.
Grid cells no larger than 2.5 acres (1.01 ha)Whole field composite, a grid of 2.5 acres or less, or directed zone sampling by landscape, yield, imagery or soil conductivity.0 to 6 inches (0 to 15.24 cm) for P, K, pH, organic matter, soluble salts, zinc, iron, manganese, copper and boron. For mobile nutrients such as nitrate, chloride and sulfur, a 24 inch sample split into 0 to 6 and 6 to 24 inches (15.24 to 60.96 cm).At least 15 cores for a whole field or a zone. A grid sample is usually 6 to 8 cores.Official guidanceSDSU Extension P-00132 (PDF)
Who it applies to, the exact wording and every source
Who it applies to
Advice from the public land-grant university extension service for South Dakota. Not law.
In force from
Under review
Legal text
SDSU Extension P-00132, Recommended Soil Sampling Methods for South Dakota (September 2019)

The wording in the source

Timing

  • In general, soil tests for P, K, pH, soluble salts, calcium (Ca), magnesium (Mg), and micronutrients will change very little from year to year and need to be analyzed only every 2 to 3 years.

    P-00132 p. 1, When and how often to sample

  • In contrast, levels of NO3-N can change dramatically from year to year and should be analyzed every year prior to planting non-legume crops.

    P-00132 p. 1, nitrate

  • In summary, a soil sample for most soil tests can be taken anytime during the year.

    P-00132 p. 2, summary

  • For most mobile nutrients, in particular NO3-N, samples should be taken in late fall (when soil temperatures are below 50° F), in winter, or in early spring.

    P-00132 p. 2, summary

Area per sample

  • the largest grid size that will adequately measure nutrient variability for a field should be no more than 2.5 acres in size.

    P-00132 p. 5, Grid sampling

Method

  • Fields may be divided into smaller parcels or “zones” or sampled as a whole field.

    P-00132 p. 4, Field sampling methods

  • The field is divided into rectangular grids and a sample is taken from each grid.

    P-00132 p. 5, Grid sampling

  • Detailed information about a field, such as yield monitor maps, remote sensing imagery, digital soil survey or topographic maps, and/or electrical conductivity data, can all help define nutrient management zones.

    P-00132 p. 5, Directed sampling

Depth

  • A 0-6 inch sample is recommended for P, K, pH, organic matter, soluble salts, zinc (Zn), iron (Fe), manganese (Mn), copper (Cu), and boron (B).

    P-00132 p. 2, Nutrients

  • A deep sample (24-inch) is recommended for mobile nutrients such as NO3-N, chloride (Cl), and sulfur …

    P-00132 p. 2, Nutrients

  • It is recommended to separate deep samples (0-24 inch) into two separate samples; one representing the 0-6 inch depth and the other a 6-24 inch depth (Figure 2).

    P-00132 p. 2, Nutrients

Cores

Sources

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

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