What are the differences between the different types of Edelman augers?
Clay soils are very cohesive and the blades on the clay auger are very narrow making the fact that they meet little resistance an advantage. Sandy soils are not cohesive. The sand auger has wider blades in order to keep the sample in. Coarse sand soils are very dry and have little cohesion. The blades of the coarse sand auger are extended with extra wings almost totally enclosing the auger. The combination auger gets a good hold of sandy material while clay-like material can be easily removed from the auger.
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