Réponse aux carences minérales de clones sélectionnés Coffea canephora Pierre
2001
Labouisse, Jean-Pierre | Charmetant, Pierre
A trial comparing twelve high yielding C. canephora clones was established in Macenta (Guinea) on an acidic, unsaturated soil, with calcium/potash misbalance and high aluminium content. Another trial at Lola on a fertile sol is used as control. Assessments on mineral deficiencies symptoms, growth and yield were made and analysed. Leaf contents were analysed. Highly significant differences are found for these criteria in the first trial. Some clones exhibit normal growth and yield without deficiency symptoms, whereas others show conspicuous deficiency symptoms and abnormal development. These are correlated with the proportion of K and Ca in the sum of cations as measured in the leaves. The role of AI in the absorption of P and of exchangeable bases is discussed. Based on this variability between the clones, it seems possible to select clones for their ability to grow and yield in unsaturated soils with a high exchangeable AI content. Propositions are made for further investigation on this tolerance. (Résumé d'auteur)
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