Se hicieron seis experimentos en columnas de suelo para determinar la solubilidad y el movimiento vertical de aplicaciones superficiales de sales de Mg en tres Ultisoles típicos de la zona montañosa de Puerto Rico. La lixiviación del Mg proveniente de la aplicación del fue óxido de magnesio mucho más lenta que la de las sales de sulfato de magnesio y sulfato de potasio-magnesio. La adición de sulfato de amonio a la banda de óxido de magnesio aumentó la solubilidad y el movimiento vertical del Mg en la columna de suelo de 15 a 85%. La urea tuvo un efecto mínimo en la solubilidad del óxido de magnesio mientras que el cloruro de potasio y el superfosfato triple fueron inefectivos.
Laboratory experiments, using disturbed soil columns, were performed to determine solubility and downward movement of surface-applied magnesium fertilizers in three Puerto Rican Ultisols. Leaching of Mg from surface-applied granular magnesium oxide fertilizers was much slower than leaching from Epsom salts and potassium-magnesium sulfate. The inclusion of ammonium sulfate in the MgO fertilizer band resulted in solubilization of Mg from the MgO and allowed greater movement into the soil profile. When ammonium sulfate was applied with MgO, 85% of the Mg dissolved and moved deep into the profile, whereas with MgO applied alone only 15% of the Mg moved. However, in the presence of high concentrations of ammonium sulfate, the extent of Mg leaching through the soil was greater than where soluble magnesium fertilizer was applied without ammonium sulfate. Urea had a lesser solubilizing effect on MgO, and potassium chloride and triple superphosphate were ineffective.
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