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Summary The efficiency of indices of aggregation was tested by assessing the accuracy with which they reflected observed differences between selected samples from a variety of Albertan and Derbyshire soils. The most efficient indices were shown to be the percentage‐weight of water‐stable aggregates > 3 mm, > 2 mm, > 1 mm, > 0.5 mm, the coefficient of aggregation, and the mean‐weight diameter. Indices also showed highly significant variations in aggregation between fourteen soil groups, ranging from humus‐iron podzol to brown solodized‐solonetz. The Derbyshire soils showed significantly higher aggregate stability than those from Alberta. These differences may be the result of variations in clay mineral type, sodium content and climatic factors.
Rorke B. Bryan (Tue,) studied this question.