How many sub-samples are recommended for a bulk soil sample?

The recommendation for the number of sub-samples to collect for a bulk soil sample generally aims to ensure representativeness and accuracy in soil analysis. Collecting between 3 and 10 sub-samples allows for sufficient variability to be captured from the area being sampled. This range helps to mitigate the influence of localized differences in soil properties that could skew results if too few samples were taken.

When sampling soil, the goal is to create a composite sample that accurately reflects the characteristics of the entire area. By collecting multiple sub-samples, variations in soil type, moisture, organic matter content, and nutrient levels are better accounted for, leading to more reliable data for assessment and decision-making.

The upper and lower bounds of the recommended range strike a balance between thoroughness and practical feasibility, making it a widely accepted standard in risk assessment practices regarding soil sampling.