Abstract
Campbell and Grime (1989) developed a novel technique to establish zones of nutrient enrichment in sand without the use of physical partitions. It is shown here that this technique can be applied to estimate the radial spread of the functional root system from individual plants in monocultures. A model is presented which allows the radial extent of the functioning root system to be estimated from the change in shoot bromide concentration with distance from a boundary between bromide-enriched and non-enriched zones in a sand medium.
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