Morocco ranks fifth among the nations of the world in almond (Prunus dulcis L.) production, and contains many zones where climatic conditions are ideal for this species. Seedling trees are responsible for more than half the total production, although grafted trees are usually much more productive per hectare. A large seedling population represents an important gene pool, both for a breeding program and for selection of superior genotypes adapted to Moroccan conditions.
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Mahhou et al. (1992) studied this question.