Russian standards
Fertilizers. Extraction of phosphorus soluble in 2 % formic acid
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Fertilizers. Extraction of phosphorous soluble in 2 % citric acid
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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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