If different soil types are present, a representative soil sample should be assimilated by mixing numerous subsamples taken across the entire area.

If different soil types are present, a representative soil sample should be assimilated by mixing numerous subsamples taken across the entire area.

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

Answer: (C)

When soil types vary across an area, sampling must reflect that variation. Each soil type has its own characteristics—pH, nutrient levels, texture, and organic matter—so you need to treat each type as its own sampling unit. If you mix subsamples from across all areas into a single composite, you blend those distinct properties into one average. That average can hide important differences, leading to recommendations that don’t fit any part of the field well.

The proper approach is to collect subsamples within each soil type and mix only those subsamples within the same type to create a composite for that type. You can then use the separate composites to guide site-specific management, or weight them by the area each type covers if you need an overall assessment. So the idea of mixing subsamples taken across the entire area to form a single representative sample is not appropriate when multiple soil types are present.