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Phosphate rock --- Geochemistry --- Analysis. --- Phosphoria Formation.
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Tithonia --- Tithonia --- case studies --- case studies --- soil fertility --- soil fertility --- Phosphorus --- Phosphorus --- Crop residues --- Crop residues --- Phosphate fertilizers --- Phosphate fertilizers --- Viet Nam --- Viet Nam
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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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