Difference between revisions of "Raphia palma-pinus"

Production and international trade: African piassava from Raphia spp. has been exported to temperate countries (mainly Europe) for the production of brooms and brushes since the end of the 19th Century, when the supply of South American piassava (from Attalea funifera Mart. and Leopoldinia piassaba Wallace), used in Europe for brooms since the middle of the 19th Century, could no longer meet demand. The trade reached its peak in the 1950s and 1960s (7000 t exported from Sierra Leone, the main exporting country, in 1964; 5300 t from Nigeria in 1966; there was also trade from Guinea), after which it declined with the advent of plastic brooms. The particular qualities of African piassava for broom-making are such that it still enters the international market. The main types of African piassava fibre in trade are ‘Sherbro’, ‘Sulima’ and ‘Calabar’ (‘Opobo’). Sherbro and Sulima are obtained from the petiole, the former from Raphia hookeri and the latter from Raphia palma-pinus, often with an admixture of Raphia hookeri fibres, whereas Calabar is extracted from the leaf sheath of Raphia hookeri. The sheath of Raphia palma-pinus is too short for extraction of sufficiently long fibre. Most of the raffia fibre of commerce is produced in Madagascar from Raphia farinifera. (PROTA)

Properties: Piassava fibre is water resistant, hard-wearing, and has the right balance between stiffness and elasticity to give a firm stroke to a broom and sufficient spring action to make the broom self-cleaning. The best piassava fibre is cylindrical with a firm wall and a soft core and a diameter of 1–1.5 mm. It is obtained from the sides (‘wings’) of the petiole, whereas fibre from the upper and lower surfaces is of only reasonable quality. Mature leaves yield higher quality piassava fibre than younger leaves. (PROTA)

Management: Raphia palms are generally propagated by seed. The traditional practice of piassava fibre extraction from the petiole is to split the petiole along the longitudinal axis into 3 or 4 splits, which are tied into bundles and immersed in water. The retting period varies from a few weeks to 2–3 months. After retting, the fibres can be stripped off relatively easily. Retting influences the appearance of the fibres. Sherbro and Sulima piassava, somewhat pale coloured at harvest, turn brownish on retting. Material retted in fresh running water tends to be pale brown, whereas material retted in stagnant swamp pools develops a reddish-brown tinge, which is attractive and leads to higher prices. The extracted fibres still have a coating of decomposing background tissue which has to be removed. In the case of Sherbro and Sulima, the retted strips are usually flogged over and drawn through a comb of pointed sticks. Fibres may also be separated and cleaned by hand. The cleanliness of the fibre has a large impact on quality and market value. Cleaned fibres may be spread out to dry in the sun for a few days. Further drying may occur under the eaves of houses or above fireplaces. Fibres which are not properly dried become mouldy and brittle and can be a fire hazard in warehouses and ships. Fibre length is an important attribute as long fibres provide more opportunities for further processing. It is also important that bundles consist of fibres of uniform length. High quality Sherbro and Sulima fibres show little variation in length and are about 1.5 m long. Although shorter fibres are acceptable, they should not be shorter than 25–30 cm. Sherbro and Sulima fibres are normally packed in bundles of 25 kg. Traditionally, bundles of fibres of differing lengths are transported to local markets, where they are weighed and priced. The buyer then mixes fibres from different sources before trimming and tying them into uniform bundles of 70–100 cm diameter. (PROTA)

Genetic resources and breeding: Raphia palma-pinus is widespread in the western part of West Africa, but it is widely exploited and its habitat is threatened by many factors, including loss of wetlands for crop farming, and drought. The level of harvesting is increasing and the palm population is believed to be decreasing. However, according to the IUCN Red list more information is needed on the population decline and impacts of threats before the conservation status of the species can be fully assessed. (PROTA)

Prospects: Raphia palma-pinus will remain a useful local source of thatch, rope, brushes and material for furniture and construction. The importance in international trade of African piassava fibre has declined sharply following the advent of plastic substitutes, but there is still demand for natural brush-fibres. This demand may even increase in the future as environmentally friendly, traditional products gain popularity. (PROTA)