Author
Listed:
- Cabidoche, Yves-Marie
- Oort, Folkert van
Abstract
Sur les sols ferralitiques du domaine expérimental INRA de Duclos (Petit- Bourg, Guadeloupe), le Macroptylium atropurpureum cv Siratro subit divers degrés de toxicité aluminique, d'une parcelle à l'autre, comme à l'intérieur d'une parcelle. Les symptômes répondent à la distribution spatiale du rapport de Kamprath (k=»AI saturation»). Cette variabilité permet la mise en évidence d'une loi de comportement unique k=f(pHKCI) sur une même parcelle. Des parcelles de positions topographiques différentes, montrent des lois différentes, k=f(pHKCI), Ca/CEC=g(pHKCI), CEC=h(Matière organique), en réponse à des nuances de composition minéralogique. Une fois déterminées, ces lois permettent de simplifier le diagnostic du chaulage. Au-delà, plus que les valeurs des variables d'état, les véritables caractéristiques physico-chimiques permanentes d'une unité de sol sont les paramètres de ces lois. ----- Grown on oxisols of I.N.R.A.'s experiment station Duclos (Petit-Bourg, Guadeloupe), Macroptylium atropurpureum cv Siratro reveals various degrees of aluminum toxicity. The symptom distribution on field-plots agrees with the spatial distribution of the Kamprath's ratio (k, «Aluminum saturation»). The soil of the field-plot, showing a tilled layer formed by a homogeneous material, display a single behaviour law : k=f(pHKCt). In order to define lime requirement, based on low costing analysis, three laws are established for different soils units : k=f(pHKCI), CA/CEC=g(pHKCl), CEC=h(O.M. content). The differences between parameters of one law, for different soil units, result from slight mineralogical gradations. More than individual state variables values, the behaviour law parameters values are characteristic of a soil-unit.
Suggested Citation
Cabidoche, Yves-Marie & Oort, Folkert van, 1989.
"Problemes Souleves Par La Caracterisation , A L'Echelle De La Parcelle, Du Statut Cationique De Sols Ferralitiques De Guadeloupe,"
25th Annual Meeting, July 1-6, 1989, Gosier, Guadeloupe
259918, Caribbean Food Crops Society.
Handle:
RePEc:ags:cfcs89:259918
DOI: 10.22004/ag.econ.259918
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