The wording in the source

Timing

• When sampling fertilized fields, avoid sampling directly in fertilized band and wait at least 2 months after last fertilization.

  step 3

Area per sample

• Take one composite sample for every 10 to 40 acres.

  Procedure for Taking Soil Samples, step 1

Method

• A separate sample should be taken for:

  step 1, followed by: areas with different soil types; different land uses or fertilizer application rates; different cropping histories; different terrain

• Areas with different soil types

  step 1(a)

• Areas with different land uses or fertilizer application rates

  step 1(b)

• Areas with different cropping histories (species and yields)

  step 1(c)

• Areas with different terrain

  step 1(d)

• Avoid sampling areas such as small gullies, slight field depressions, terrace, waterways, or unusual areas.

  step 2

• When sampling fertilized fields, avoid sampling directly in fertilized band

  step 3

Depth

• Take a 0-6 inch sample, insure equal soil throughout this six inch depth.

  step 6

Cores

• It is important to repeat steps 4-6 an additional 9 to 14 times for each area identified in steps 1-3.

  step 7

The wording in the source

Timing

• Before you begin to apply waste, and after you begin applying waste in accordance with the CAFO rules and General Permit, you are required to collect and analyze representative soil samples from each permitted land management unit (LMU)

  RG-408 p. 1, What is the purpose of soil sampling?

• Sampling is conducted annually using the same grid layout to improve field sub-sampling consistency.

  RG-408 p. 3, GPS Grid Method

Method

• Methods for locating subsamples include the following: professional judgment, grid and GPS Grid.

  RG-408 p. 2

Depth

• If you are required to take 0–2 in and 2–6 in samples, collect a 0–6 in sample and divide according to depth.

  RG-408 p. 2

• If you cannot collect the entire 6–24 in sample for more than the minimum 10 subsamples, specify the average depth that was obtained for the LMU.

  RG-408 p. 3

Cores

• A representative composite sample typically should be composed of a composite of 10 to 15 (preferably 15) discrete subsamples for each depth increment within an LMU

  RG-408 p. 2

Laboratory and analysis

• Coordinate with an agronomic soil laboratory

  RG-408 p. 1

• appropriate soil test methodology found in the Standard Operating Procedures (SOPs) for the Texas AgriLife Extension Service Soil, Water and Forage Testing Laboratory.

  RG-408 p. 2

Field identifiers

• GPS each subsample location and maintain the information for a period of two years.

  RG-408 p. 3, Grid Sampling and GPS Grid methods