Calidad del suelo. Determinación de nitrógeno total. Método Kjeldahl modificado.
Soil quality. Determination of total nitrogen. Modified Kjeldahl method.
Qualité du sol. Dosage de l'azote total. Méthode de Kjeldahl modifiée.
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13.080.05 / Examination of soils in general
CTN 77/SC 3 - Soil
ISO 11261:1995 (Identical)
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