The wording in the source

Timing

• Facilities required to maintain an NMP, pursuant to these rules, must have soil samples collected each year from all fields owned or operated by the dairy, beef, poultry, or commercial truck wash operation to which livestock waste, manure, or process wastewater from the operation was land applied.

  Section 150, Soil Samples

Method

• All soil samples collected pursuant to this chapter must be representative samples that are collected by a CSS at the depth indicated by the approved NMP for each facility. Samples shall be collected pursuant to SSB approved methods and submitted to an approved laboratory.

  Section 151, Soil Sample Collection

• August 1997 University of Idaho, Soil Sampling Bulletin 704 (revised).

  Section 104.01, Incorporation by Reference

• All persons who collect soil samples pursuant to Subchapter A must be a certified soil sampler via the Department Certification Program.

  Section 152, Soil Sample Certification

Who it applies to

• Facilities required to maintain an NMP, pursuant to these rules, must have soil samples collected each year from all fields owned or operated by the dairy, beef, poultry, or commercial truck wash operation to which livestock waste, manure, or process wastewater from the operation was land applied.

  Section 150

• All dairy farms licensed to sell milk for human consumption, beef cattle feeding operations required to implement a Nutrient Management Plan (NMP), poultry operations required to implement an NMP, certified NMP planners and certified soil samplers.

  Rule summary, Who does this rule apply to?

Laboratory and analysis

• Approved Laboratory. A soil testing laboratory with a valid certification from the North American Proficiency Testing Program under the auspices of the Soil Science Society of America.

  Section 110.01, Definitions

Field identifiers

• If resource concerns require an alternate sampling depth be used, the CSS must indicate the alternate depths on all samples and lab submission forms.

  Section 151

The wording in the source

Timing

• For optimal soil fertility management, samples should be collected each year, and fields fertilized for a realistic potential yield of the intended crop.

  Sampling Frequency

• It is recommended to collect soil samples at least once during each crop rotation cycle (Walworth 2011).

  Sampling Frequency

Method

• Soil cores must be taken randomly within each sampling unit; be sure to distribute sampling sites throughout the unit. Meander or zigzag throughout each sampling unit while collecting soil samples.

  Sampling Technique, 2. Plan out sampling path

• Since most fields are not completely uniform and may vary in topography, divide each field into sampling units (Figure 1).

  Sampling Technique, Divide field into units

Depth

• With wheat rooting depth reaching up to 5 ft, it would be beneficial to sample wheat fields to 5 ft, in 1 ft increments.

  Sampling Technique, 4. Define sampling depth

• Although most fertilizer guides are based on a 2 ft depth, the sampling depth should be tailored to crop-specific rooting depth for the most accurate recommendations. For beans and sugar beets, the soil samples are typically collected from 2 ft. For potatoes, 1 ft samples are appropriate, due to a shallower rooting depth.

  Sampling Technique, 4. Define sampling depth

Cores

• Table 1, field size in acres and recommended number of samples: <5 15; 5–10 18; 10–25 20; 25–50 25; >50 30

  Table 1 (table, transcribed)

• *An absolute minimum of 10 samples from each sampling unit is necessary to obtain an acceptable sample.

  Table 1 footnote