| Popis: |
Chez l\'hevea, la plupart des clones selectionnes a bas âge, a partir de la combinaison des quatre parametres physiologiques du latex (Pi, Sac, Exs et R-SH) qui expliquent au mieux la productivite adulte, n\'expriment pas l\'augmentation de production attendue a l\'âge adulte. L\'efficacite de prediction des rendements de ces parametres pris individuellement a ete etudiee, chez les arbres adultes. Des correlations ont ete etablies entre la production et les parametres physiologiques mesures a un stade precoce de la selection (CCPE). Des correlations ont egalement ete etablies entre ces memes parametres physiologiques mesures en CCPE et la production estimee en fin de selection (CCGE). Le saccharose et le phosphore inorganique ont presente les meilleures tendances a predire le potentiel de production a l\'âge adulte. In rubber tree, most of clones selected early by combining the four physiological parameters of latex (Pi, Sac, Exs and R-SH ) that better explain productivity didn\'t express expected yield increasing at the old age. The efficiency of each of these physiological parameters to predict the yield of clones has been studied at the old age. Correlations have been subsequently established between the physiological parameters and the yield at the early stage of the selection (CCPE). Likewise, correlation have been established between the same physiological parameters recorded at the early stage (CCPE) and the predicted yield at the final step (CCGE) of selection. Sucrose and inorganic phosphorus exhibited best tendencies to predict yield potential of rubber tree clones at old age. Keywords : Hevea brasiliensis , production, selection precoce, parametres physiologiques, CI; Hevea brasiliensis , production, early selection, physiological parameters, CI. Agronomie Africaine Vol. 16 (3) 2004: pp. 1-10 |
