Hevea brasiliensis Muell. Arg. belongs to the family Euphorbiaceae Although it originated in South America primarily in the Amazon basin, but it is now, mainly cultivated in South East Asia. Of the ten species, only H. benthamiana, H. brasiliensis and H. guianensis yield rubber of acceptable quality (Carron et al, 1989). As H. brasiliensisis the highest yielder, it was extensively cultivated a century ago in South East Asia. It has been established, practically, as the only important natural source of rubber with desirable physical properties (Archer and Audley, 1973). The tree is monoecious and it grows best at temperatures of 20–28°C with an average annual rainfall of 1800–2000 mm. It grows satisfactorily on most soils with adequate drainage, and is prone to damage by strong winds. The prime growing area is defined by temperature and rainfall, and is confined between 10° latitudes on either side of the equator.
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