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Determinación de S cambiable del suelo por el método colorimétrico del metiltimol azul
(Instituto Interamericano de Cooperación para la Agricultura (IICA), 1982-04)
Traditional methods Jim determinist the exchangeable S of soils lack sensitivity, reproducibility, and are too time consuming. The method described in this paper is more favorable. Blue methylthymol in a high pH (12.70) ...