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Engrais phosphaté --- Phosphate fertilizers --- Fertilité du sol --- soil fertility --- Ferralsol --- Ferralsols --- Engrais organique --- Organic fertilizers --- Système de culture --- cropping systems --- Zea mays --- Légumineuse à grains --- Grain legumes --- République-Unie de Tanzanie --- United Republic of Tanzania --- Theses
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soil fertility --- Physiographic soil types --- cartography --- soil types --- Pedology --- agricultural extension --- soil chemicophysical properties --- soil chemicophysical properties --- Watersheds --- Watersheds --- participatory approaches --- participatory approaches --- Rwanda
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