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For about ten years the author has been using the type of core sampler illustrated b\' Figs. I to 3 in bulk density and related determinations. As the device enables rapid working, it has also found application in such investigations in which the sample need not necessarily have an accurate volume if only it is representative of a given soil layer. Consequently, it has also been used by the author’s colleagues, for instance in investigating the movement of top dress nitrogen and boron in the soil.

A soil core sampler with provision for cutting successive layers