If different soil types are present, composite soil samples should be assimilated separately for each distinctive soil-type area.

• A. False
• B. True
• C. Not sure
• D. Sometimes

Answer: (B)

When soil characteristics vary across a turf area, sampling must reflect that variation. Different soil types have distinct pH, nutrient-holding capacity, texture, drainage, and organic matter, all of which influence how nutrients are available to the grass. If you mix subsamples from different soils into a single composite, you get an average that doesn’t accurately represent any one zone. That blurs the true needs of each area and can lead to applying too much or too little lime and fertilizer, or altering amendments inappropriately.

By taking separate composite samples for each distinctive soil type, you preserve the unique profile of each zone. The lab can then provide zone-specific recommendations, enabling precise management across the field. To implement this, identify the different soils, collect subsamples within each area, create a composite for that soil type, and submit each composite separately. This approach is the most reliable way to guide turf nutrition and amendment decisions when soil types are heterogeneous.