Sampling Instructions

Accurate analysis begins with and depends greatly on sample collection. We've pulled together detailed directions and our expert team's tips to create video resources to make sampling any material easy and accurate.

Soil and Agronomy Sampling Instructions

Collecting a Soil Sample from Commercial Vegetable or Fruit Fields

Collecting a Soil Sample for a Lawn, Garden, or Wildlife Food Plot

Collecting a Soil Sample for a Soybean Cyst Nematode Analysis

Late Season Cornstalk Nitrate Test Sampling Procedure

Manure Sampling Instructions

Plant Tissue Sampling Instructions

Pre-Plant Nitrogen Test (PPNT) Sampling Instructions

Animal Nutrition Sampling Instructions

Sampling Hay, Silage, and Total Mixed Rations for Analysis

Mill Quality Assurance Sample Collection

Forage Sampling Article as seen in Hay and Forage Grower



Hemp Sampling Instructions

For nutrient analysis of plant tissue:

1. Collect the newest, fully developed leaf from at least 30 plants in the problem area. It’s important to collect a sample that’s representative of the area of concern.

2. If there is a good area as well as a bad area, it’s a good idea to collect samples from both. This will allow for a comparison between the good and poor crop. That’s especially important in hemp, as there is little information on plant tissue interpretation. 

For Potency: 

The US Hemp Authority provides sampling and handling hemp procedures for THC & CBD Analysis in their Guidance Procedures for Growers, Processors / Manufacturers, Brand Owners linked here: Exact procedures for pre-harvest sampling are listed in section 1.4.3 on page 7 of that booklet. 

Water Sampling Instructions

  1. Open the faucet and let the water run for five minutes. Do not treat the water before sampling.
  2. Fill the sample container 3/4 full of water. Screw cap on very tightly to prevent leaks.
  3. Submit the sample to the laboratory within 48 hours of collection. If the sample cannot be submitted within 48 hours, refrigerate the sample.

Rock River Laboratory

Founded in 1976, Rock River Laboratory is a family-owned laboratory network that provides production assistance to the agricultural industry through the use of advanced diagnostic systems, progressive techniques, and research-supported analyses.  Employing a team of top specialists in their respective fields, Rock River Laboratory provides accurate, cost-effective, and timely analytical results to customers worldwide, while featuring unsurpassed customer service.

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