Russian standards PDF

Fertilizers. Determination of the fineness of grinding of soft natural phosphates

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Fertilizers. Extraction of total sulfur present in various forms

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Fertilizers. Extraction of water soluble sulfur where the sulfur is in various forms

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Fertilizers. Determination of the fineness of grinding (dry method)

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Fertilizers. Extraction of phosphorus soluble in mineral acids

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Fertilizers. Extraction of phosphorus which is soluble in neutral ammonium citrate

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