Long term experimental design; Nearest neighbour models; Aleppo pine; Essais à long terme; Modèles des plus proches voisins; Pin d'Alep
Abstract :
[en] In 1964 – 1965, four long term trials were established in Tunisia to compare several origins of Aleppo pine (Pinus halepensis Mill.). Nearest neighbour models were used to control soil’s heterogeneity and to reduce experimental error unitil to 79 %. After adjustment of data, statistical methods are applied to choice origins for a reforestation program. [fr] En 1964–1965, quatre essais à long terme ont été implantés en Tunisie pour comparer de 30 à 40 provenances de pin d’Alep (Pinus halepensis Mill.). Pour mieux contrôler l’hétérogénéité spatiale du terrain, l’aptitude des modèles des plus proches voisins est étudiée et le modèle finalement retenu permet de réduire l’erreur expérimentale jusqu'à 79 %, selon la variable considérée. Sur base des données ainsi ajustées, des méthodes statistiques, dont les analyses intra-essais et inter-essais, permettent de déterminer les provenances à conseiller dans le cadre d’un programme de reforestation.
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