LIXIVIACIÓN DE NITRATOS EN DOS SUELOS AL ALTERAR SUS PROPIEDADES FÍSICAS
LIXIVIACIÓN DE NITRATOS EN DOS SUELOS AL ALTERAR SUS PROPIEDADES FÍSICAS
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Se realizaron dos experimentos en los cuales, mediante la mezcla de horizontes A y B o arena y horizontes B, se alteraron los contenidos de materia orgánica en un grupo y arena en otro, en dos suelos diferentes deldepartamento de Antioquia: un Andisol y un Oxisol, con el propósito de determinar cÛmo los cambios inducidos artificialmente en estas propiedades afectan la capacidad del suelo para retener nitratos.
Los incrementos en el contenido de arena aumentaron significativamente las cantidades de nitrógeno recuperado en columnas de lixiviación, en tanto que las alteraciones en el contenido de materia orgánica sólo afectaron la capacidad para retener nitratos en el Andisol. El experimento permitió identificar los suelos estudiados como altos retenedores de nitratos, no obstante, existen otros factores adicionales a las características estudiadas que no fueron considerados en este experimento, igualmente importantes en la retención del ion.
Abstract: Two experiments in columns were carried out, to study how changes in organic matter and sand content ofsoil could affect its ability to retain added nitric nitrogen. Mixtures of A and B horizons or quartz sand and B horizontaken from soils belonging to Andisol and Oxisol orders, let us artificially change organic matter and sand content ineach soil before a nitrate leaching test. Changes in sand content significantly reduce the ability to retain nitricnitrogen in both soils, and organic matter reduction accounted for a increase in nitrate leaching only in the Andisol.A brief discussion is shown, about the possible role of another conditions influencing nitrate leaching in this soils.
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