Abstract
A simple instrument has been devised for the comparative estimation of soil moisture under field conditions where more elaborate tecniques are not practicable. It consists of a solid length of porous clay, the size and shape of an ordinary pencil, pointed at one end and with a graduated scale along its length. The point is stuck into the soil, and the distance to which the water moves along the stem is used as a measure of the water-supplying power of the soil. Since it is not possible to calibrate in absolute units, the direct readings are used comparatively. Laboratory and field tests of the instrument are discussed.
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