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Zahtjevi za uzorkovanje tla u Ohiju

Zahtjevi za uzorkovanje tla u Ohiju

Državne smjernice: Ohio State University Extension, informativni listovi Ohioline.

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

Koliko hektara može pokriti jedan uzorak tla u Ohiju?

Koliko duboko treba uzimati uzorke tla u Ohiju?

Koliko jezgara ide u jedan uzorak tla u Ohiju?

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

Ohio State University Extension, Ohioline fact sheets: Za ujednačeno polje od 100 hektara potrebna su najmanje 4 složena uzorka, svaki ne veći od 25 hektara, i ukupno najmanje 60 jezgri, 15 po uzorku.

Uzorci i jezgre za bilo koju veličinu polja

Soil sampling rules in Ohio, with the exact wording of each source
Country / region Purpose / programme Time / frequency Area per sample Method Depth Cores Status and source
United States
OhioUnited StatesOhio only. Other states set their own rules.Soil sampling to develop nutrient recommendationsOhio State University Extension, Ohioline fact sheetsNot specifiedNo sample zone over 25 acres (10.12 ha). Grid option: one point per 2.5 acres (360 by 360 feet).Systematic grid sampling, or management zones from yield maps, management history and other data; zigzag through each zone. Georeferenced points help track trends.8 inches (20.32 cm), the depth most soil tests are calibrated to. No-till: a 0 to 2 inch (0 to 5.08 cm) sample for pH may help.At least 15 cores per composite from 25 acres or less; 20 to 25 after banded fertilizer. Zones: 10 to 15 cores. Grid points: 8 cores within a 10-foot circle.Official guidanceOhioline AGF-513, Soil Sampling to Develop Nutrient Recommendations
Who it applies to, the exact wording and every source
Who it applies to
Advice for Ohio fields from Ohio State University Extension. Not law.
Laboratory and analysis
Ask whether the lab follows Recommended Chemical Soil Test Procedures for the North Central Region.
In force from
Under review
Legal text
Ohio State University Extension, Soil Sampling to Develop Nutrient Recommendations (AGF-513, 2012)

The wording in the source

Area per sample

Method

Depth

  • Most soil tests are calibrated using an 8-inch sampling depth, which corresponds to the plow depth. Management in no-till systems may benefit from a 0–2 inch sample for pH, especially where pH-sensitive herbicides are used.

    AGF-513, Taking the Soil Cores

Cores

  • For a standard soil sample, take at least 15 sample cores from each field area of 25 acres or less into one composite sample.

    AGF-513, Taking the Soil Cores

  • If the field has a history of banded fertilizer applications, increase the number of samples to 20–25 cores.

    AGF-513, Taking the Soil Cores

  • Sample points should be taken randomly with 10–15 cores per sample area of up to 25 acres.

    AGF-513, Zone Management

  • Soil samples are collected at each sample point within a 10-foot diameter circle, with two cores pulled from each quadrant, for a total of eight cores.

    AGF-513, Systematic Grid Sampling

Laboratory and analysis

  • Standards for laboratory procedure and extraction solutions have been established by land-grant universities in the publication Recommended Chemical Soil Test Procedures for the North Central Region. It is a good practice to ask if the laboratory utilizes these procedures in their analysis process.

    AGF-513, Sending the Sample to the Testing Lab

Sources

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

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