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Phosphoric acid. --- Phosphates. --- Phosphatic fertilizers.
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Phosphatic fertilizers --- Superphosphates --- Congresses --- Congresses
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Nitrogen fertilizers --- Phosphatic fertilizers --- Fertilizers --- Application
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Phosphate rock --- Phosphatic fertilizers --- Phosphorus in agriculture
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Nitrogen fertilizers --- Phosphatic fertilizers --- Congresses --- Congresses
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Nitrogen fertilizers --- Phosphatic fertilizers --- Manures --- Environmental aspects
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