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Zahteve za vzorčenje tal v Arizoni

Zahteve za vzorčenje tal v Arizoni

Državne smernice: Univerza v Arizoni, zadružna razširitev, vodnik za vzorčenje tal.

Vzorčenje tal v Arizoni: pogostost, površina, globina in jedra

Kako pogosto je treba vzorčiti zemljo v Arizoni?

Koliko hektarjev lahko pokrije en vzorec tal v Arizoni?

Kako globoko je treba odvzeti vzorce tal v Arizoni?

Koliko jeder gre v en vzorec tal v Arizoni?

Koliko vzorcev tal potrebuje 100-akrsko polje v Arizoni?

University of Arizona Cooperative Extension, soil sampling guide: 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 Arizona, with the exact wording of each source
Country / region Purpose / programme Time / frequency Area per sample Method Depth Cores Status and source
United States
ArizonaUnited StatesArizona only. Other states set their own rules.Soil sampling for commercial crop productionUniversity of Arizona Cooperative Extension, soil sampling guide
  • Repeat Regularly, if not every season, before planting each crop
Whole field sampling: one composite sample per 15 to 20 acresWhole field: random cores in a zigzag across the field. Grid: composites per grid cell or points at grid intersections. Zone: separate composites where variation is already known.12 inches for vegetables such as lettuce, spinach, broccoli, celery or cantaloupes. 24 inches for cotton, alfalfa, corn or wheat. Tilled soils to tillage depth.15 to 20 cores or scoops per site, depending on field size and the laboratoryOfficial guidanceUniversity of Arizona Cooperative Extension AZ2147 (PDF)
Who it applies to, the exact wording and every source
Who it applies to
Advice for commercial agriculture in Arizona from the University of Arizona Cooperative Extension. Not law.
In force from
Under review
Legal text
University of Arizona Cooperative Extension AZ2147, A Guide to Effective Soil Sampling for Sustainable Crop Production (July 2025)

The wording in the source

Timing

  • Growers managing agricultural lands are encouraged to test their soils regularly, if not every season, before planting each crop.

    AZ2147, Introduction

Area per sample

Method

  • Samples are collected randomly in a zigzag pattern across the field without consideration of any management practices or topographic features.

    AZ2147, 1. Whole Field Sampling

  • Grid sampling (Figure 4) is a type of spatial sampling that involves dividing the whole field into uniform grids.

    AZ2147, 2. Grid Sampling

  • The first method is done by collecting composite samples in the individual grid, which provides information about the area. The second method of grid sampling is done by collecting soil samples at the points created by the overlapping lines.

    AZ2147, 2. Grid Sampling

  • Zone sampling (Figure 5) is used when points of variation across a field are already known.

    AZ2147, 3. Zone Sampling

Depth

  • For example, if the crop is a vegetable such as romaine or iceberg lettuce, spinach, broccoli, celery, or cantaloupes, a 12-inch sampling depth is adequate; however, for crops like cotton, alfalfa, corn or wheat, a 24-inch sampling depth is recommended.

    AZ2147, Composite Sampling

  • For example, tilled soils only need to be taken to the depth that tilling has occurred.

    AZ2147, Composite Sampling

Cores

  • In general, 15 to 20 soil samples (cores or scoops) (Figure 2) are collected per site (or plot), depending on the size of the field and the requirements of the laboratory doing the testing.

    AZ2147, Composite Sampling

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

Prijavi zastarelo zahtevo: info@geopard.tech

Načrtujte točke glede na pravilo, ki velja

Nastavite površino na vzorec, jedra in globino, ki jo zahteva vaše pravilo. GeoPard postavi točke na mrežo ali po conah, določi pot sprehoda, natisne oznake in načrt odnese na teren s telefonom.

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