ISHS Acta Horticulturae 185: I International Protea Research Symposium
THE SIGNIFICANCE OF PROTEOID ROOTS IN PROTEAS |
| Author: | Byron B. Lamont |
| Abstract:
Dense clusters of hairy rootlets, called proteoid roots, are a feature of all cultivated species of protea. They form a 2–5 cm thick mat at the soil surface and are most prolific where there is decomposing litter. They are most abundant under the plant's canopy but can extend for much greater distances. Their prime function is to enhance nutrient uptake but they probably have a major role in water uptake as well. Their formation is suppressed by high nutrient availability, clayey soils, waterlogging and drought and enhanced by organic matter, soil bacteria (which do not invade the root) and moisture. Crop management practices should emphasise minimal root disturbance: a) rotavating is not recommended, b) weed control is important, via slashing or contact herbicides, c) restraint should be exercised with applications of chemicals, especially fertilizers high in phosphates, d) build up of a surface mulch diminishes the need for fertilizers, e) plants in fertile soils will need more regular watering during dry periods, f) delay fertilizer-application immediately after transplanting. | |
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