Soil sampling requirements in Louisiana

Q: How many soil samples does a 100-acre field need in Louisiana?

Under LSU AgCenter soil sampling, testing and test interpretation advice: A uniform 100-acre field needs at least 10 composite samples of no more than 10 acres each, and at least 120 cores in all, 12 per sample.

State guidance: LSU AgCenter soil sampling, testing and test interpretation advice.

Soil sampling in Louisiana: frequency, area, depth and cores

How often do you need to soil sample in Louisiana?

LSU AgCenter soil sampling, testing and test interpretation advice Official guidance At least once every two to three years, or once per complete crop rotation.

When in the year should soil be sampled in Louisiana?

LSU AgCenter soil sampling, testing and test interpretation advice Official guidance At the same time each year.

How many acres can one soil sample cover in Louisiana?

LSU AgCenter soil sampling, testing and test interpretation advice Official guidance Zone sampling: one composite per 10 acres. Grid sampling: one composite per 2.5 acres; start new fields at 1 acre.

How deep should soil samples be taken in Louisiana?

LSU AgCenter soil sampling, testing and test interpretation advice Official guidance 0 to 6 inches.

How many cores go into one soil sample in Louisiana?

LSU AgCenter soil sampling, testing and test interpretation advice Official guidance 12 to 15 subsamples per composite: one to two per acre for zones, five to six per acre for grids. More where fertilizer was banded or manure spread.

How many soil samples does a 100-acre field need in Louisiana?

LSU AgCenter soil sampling, testing and test interpretation advice: A uniform 100-acre field needs at least 10 composite samples of no more than 10 acres each, and at least 120 cores in all, 12 per sample.

Samples and cores for any field size

Soil sampling rules in Louisiana, with the exact wording of each source
Country / region	Purpose / programme	Time / frequency	Area per sample	Method	Depth	Cores	Status and source
United States
LouisianaUnited StatesLouisiana only. Other states set their own rules.	Routine soil fertility samplingLSU AgCenter soil sampling, testing and test interpretation advice	Repeat At least once every two to three years, or once per complete crop rotation Season At the same time each year	Zone sampling: one composite per 10 acres. Grid sampling: one composite per 2.5 acres; start new fields at 1 acre.	Zone or grid sampling, subsamples in a zigzag pattern within each zone or grid cell. In furrow-irrigated fields, sample the bed top 4 to 6 inches from the row.	0 to 6 inches	12 to 15 subsamples per composite: one to two per acre for zones, five to six per acre for grids. More where fertilizer was banded or manure spread.	Official guidanceLSU AgCenter P3934, Soil Sampling, Testing and Test Interpretation (PDF)
Who it applies to, the exact wording and every source Who it applies to Advice for Louisiana fields from the LSU AgCenter. Not law. Laboratory and analysis A certified soil laboratory. Louisiana fertilizer recommendations are based on the Mehlich-3 extraction of 0 to 6 inch samples. Use the same laboratory each year. Field identifiers Label each bag with farm name and location, sampling date and depth, previous crop and the crop to be grown. In force from Under review Legal text LSU AgCenter P3934, Soil Sampling, Testing and Test Interpretation for Fertilizer Recommendations (July 2024) The wording in the source Timing Frequency of testing: Test soil at least once every two to three years or once per complete crop rotation. P3934, Soil Sampling Procedure, item 1, p. 2 Take soil samples at the same time each year, maintaining a consistent depth of 0 to 6 inches using a soil probe or auger (see Figure 1). P3934, Soil Sampling Procedure, item 2, p. 2 Area per sample Zone sampling: Take one composite sample for every 10 acres. P3934, Sampling density, p. 2 Grid sampling: Take one composite sample for every 2.5 acres. A smaller grid is better than a large grid. For new fields without prior soil testing information, it is advisable to start with a smaller grid (1 acre). P3934, Sampling density, p. 2 Method Collect subsamples in a zigzag pattern within each zone or grid. P3934, Soil Sampling Procedure, p. 2 In furrow irrigation systems, sample from the top of the bed, 4 to 6 inches away from the crop row. P3934, Preparation for sampling, p. 2 Depth Take soil samples at the same time each year, maintaining a consistent depth of 0 to 6 inches using a soil probe or auger (see Figure 1). P3934, Soil Sampling Procedure, item 2, p. 2 Cores Each composite sample should include 12 to 15 subsamples (one to two per acre for zone sampling and five to six per acre for grid sampling). P3934, Subsample collection, p. 2 More subsamples are required for fields with past fertilizer banding or manure spreading. P3934, Soil Sampling Procedure, p. 2 Laboratory and analysis Test soil samples in a certified soil lab, such as the LSU AgCenter Soil Testing and Plant Analysis Lab in Baton Rouge. P3934, Soil Testing, item 1, p. 3 In Louisiana, fertilizer recommendations are based on the Mehlich-3 soil extraction method for samples collected from a 0- to 6-inch depth. P3934, Soil Testing, item 1, p. 3 Analyze soil samples in the same lab each year to maintain a consistent historic record. P3934, Soil Testing, item 2, p. 3 Field identifiers Clearly label the bag with the farm name and location, sampling date and depth, previous crop and the expected crop to be grown. P3934, Sample handling, p. 2 Sources LSU AgCenter P3934, Soil Sampling, Testing and Test Interpretation (PDF) Guidance Sources re-checked every two months, last update October 2026. Reviewed by GeoPard editorial team.

United States: federal rules and every other state

Soil sampling regulations in every country

Report an outdated requirement: info@geopard.tech

Plan the points to the rule that applies

Set the area per sample, the cores and the depth your rule asks for. GeoPard places the points on a grid or by zone, routes the walk, prints the labels and takes the plan to the field on a phone.

Create a sampling plan See the Soil Sampling Planner

A planning reference built from official sources, not legal advice. Rules apply by jurisdiction, nutrient, land use and programme: check the current official text and your laboratory’s instructions before fieldwork.

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Soil sampling requirements in Louisiana

Soil sampling requirements in Louisiana

Soil sampling in Louisiana: frequency, area, depth and cores

How often do you need to soil sample in Louisiana?

When in the year should soil be sampled in Louisiana?

How many acres can one soil sample cover in Louisiana?

How deep should soil samples be taken in Louisiana?

How many cores go into one soil sample in Louisiana?

How many soil samples does a 100-acre field need in Louisiana?

The wording in the source

Timing

Area per sample

Method

Depth

Cores

Laboratory and analysis

Field identifiers

Sources

Plan the points to the rule that applies

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