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Zahtjevi za uzorkovanje tla u Wisconsinu

Zahtjevi za uzorkovanje tla u Wisconsinu

Državne smjernice: UW Extension A2100, Uzorkovanje tla za ispitivanje.

Uzorkovanje tla u Wisconsinu: učestalost, površina, dubina i jezgre

Koliko često trebate uzimati uzorke tla u Wisconsinu?

Kada u godini treba uzorkovati tlo u Wisconsinu?

Koliko hektara može pokriti jedan uzorak tla u Wisconsinu?

  • UW Extension A2100, Sampling Soils for Testing Official guidance One composite per 5 acres (2.02 ha) on responsive fields and fields not sampled in the past 4 years. Fewer samples on nonresponsive fields tested within 4 years (Table 1).

Koliko duboko treba uzimati uzorke tla u Wisconsinu?

  • UW Extension A2100, Sampling Soils for Testing Official guidance Plow depth or at least 6 inches (15.24 cm). Chisel or disk: three quarters of tillage depth. Ridge till: 6 inches on ridges, 4 in furrows. No-till: 6 to 7 inches (17.78 cm) for fertilizer advice, plus 2 inches for pH if an acid layer is suspected.

Koliko jezgara ide u jedan uzorak tla u Wisconsinu?

Koliko uzoraka tla je potrebno za polje od 100 hektara u Wisconsinu?

UW Extension A2100, Sampling Soils for Testing: Za ujednačeno polje od 100 hektara potrebno je najmanje 20 složenih uzoraka, ne većih od 5 hektara svaki, i ukupno najmanje 200 jezgri, 10 po uzorku.

Uzorci i jezgre za bilo koju veličinu polja

Soil sampling rules in Wisconsin, with the exact wording of each source
Country / region Purpose / programme Time / frequency Area per sample Method Depth Cores Status and source
United States
WisconsinUnited StatesWisconsin only. Other states set their own rules.Routine soil fertility samplingUW Extension A2100, Sampling Soils for Testing
  • Repeat At least every 4 years. Sands and loamy sands every 2 years.
  • Season Any convenient time; fall may be best, so lime and fertilizer advice arrives in time. Hayfields after any cutting. Stay consistent from one year to the next.
One composite per 5 acres (2.02 ha) on responsive fields and fields not sampled in the past 4 years. Fewer samples on nonresponsive fields tested within 4 years (Table 1).W-shaped pattern for a whole field composite. Unaligned grid-point sampling at 200 feet (about 1 acre) or, on nonresponsive fields, 300 feet (2 to 2.5 acres). Zone (smart) sampling.Plow depth or at least 6 inches (15.24 cm). Chisel or disk: three quarters of tillage depth. Ridge till: 6 inches on ridges, 4 in furrows. No-till: 6 to 7 inches (17.78 cm) for fertilizer advice, plus 2 inches for pH if an acid layer is suspected.At least 10 cores per composite. 10 to 20 cores give a more representative sample.Official guidanceUW Extension A2100, Sampling Soils for Testing (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 Wisconsin. Not law in itself; plans prepared to the NRCS 590 standard follow its sampling techniques.
Laboratory and analysis
A Wisconsin certified laboratory, for plans that must follow the NRCS 590 standard.
In force from
Under review
Legal text
University of Wisconsin-Extension A2100, Sampling Soils for Testing (Peters and Laboski, 2013)

The wording in the source

Timing

Area per sample

  • For responsive fields, as well as all fields that have not been sampled in the past 4 years, take one composite sample for every 5 acres.

    A2100 p. 3, step 3

  • Table 1. Recommended sample intensity for uniform fields: fields tested more than 4 years ago OR fields testing in the responsive range, all fields, 1 sample/5 acres; nonresponsive fields tested within past 4 years, 5–10 acres 2, 11–25 acres 3, 26–40 acres 4, 41–60 acres 5, 61–80 acres 6, 81–100 acres 7

    A2100 p. 1, Table 1 (transcribed)

Method

  • use a W-shaped sampling pattern (as shown in Figure 1) over the whole area the sample represents.

    A2100 p. 1

  • Where there is no information about the P or K status of the field or where previous tests were in the responsive range, a 200-foot grid size should be used. This is equivalent to approximately one soil sample per acre.

    A2100 p. 2, site-specific management

  • Fields that have soil test P and K levels in the nonresponsive categories should be grid-point sampled on a 300-foot grid. This is equivalent to one soil sample for every 2 to 2.5 acres.

    A2100 p. 2

  • Smart (zone or directed) sampling. Another approach gaining support among researchers is smart sampling, also known as directed or management zone sampling.

    A2100 p. 3

Depth

Cores

  • Each sample should be made up of a minimum of 10 cores to ensure accurate representation of the nutrient needs of the field.

    A2100 p. 1

  • Research has shown that taking 10 to 20 cores provides a more representative sample of the area than when samples are made up of fewer cores.

    A2100 p. 1

Laboratory and analysis

Sources

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

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