A Simple Wetness Recorder

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Abstract
SUMMARY When wetted overnight by dew, dye spots on a cone-shaped paper ‘sensor’ will spread to an extent which depends on both the duration and the intensity of dewfall. Results from such a sensor have been compared with those from the de Wit recorder. Although only a qualitative assessment of surface wetness is obtained, the paper sensors are cheap and easily replicated, they can be stored for assessment later and they can be made in sizes to suit any particular situation in the field.

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