Abstract
The range of techniques available for measuring soil moisture content is reviewed. Consideration is given to in situ, remote and non-contact methods. Emphasis is placed on the last method as the aim of the review was to identify possible techniques for the rapid determination of soil moisture content to depths of 10–100 mm below the surface by equipment mounted on mobile field machinery with a view to routine operational use on the farm. Of the techniques available, active microwave scattering/absorption and near infra-red reflectance methods have potential for development into suitable sensors.
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