Arylsulphatase in the rhizosphere of plantain Musa AAB and its relation with growth, development and pr Arilsulfatasa en la rizosfera de plátano, Musa AAB y relación con crecimiento, desarrollo y produccion

<&59;p align&61;"justify">&59;Arylsulphatase in the rhizosphere of plantain <&59;em>&59;Musa<&59;/em>&59; AAB and its relation with growth, development and production. In a plantain crop (<&59;em>&59;Musa<&59;/em>&59; AAB) of the Central coffee growing zone of Colombia, arylsulphatase activity in a <&59;em>&59;Pachic Melanudand Medial Isotermic<&59;/em>&59; soil under three agronomic management systems during 18 months was measured. Measurements were done at 6, 12 and 18 months in four depths, 0-5, 5-10, 10-20, 20-30 cm. The highest arylsulphatase activity (60%) was found in the first 10 cm, with a decreasing in depth. Statical analysis did not show significant differences among the three plant ages. Arylsulphatase activity was found between 164 <&59;em>&59;&&59;micro&59;<&59;/em>&59;mol g<&59;sup>&59;-1<&59;/sup>&59; min<&59;sup>&59;-1<&59;/sup>&59; and 319 <&59;em>&59;&&59;micro&59;<&59;/em>&59;mol g<&59;sup>&59;-1<&59;/sup>&59; min<&59;sup>&59;-1<&59;/sup>&59;. The lowest activity was found in the rhizosphere of plants with 12 months of age (flowering) under chemical management. Arylsulphatase activity showed very significant correlation with Biomass-C and with Mg in soil, number of leaf and the plantain bunch weight.<&59;/p>&59;<&59;p align&61;"justify">&59;<&59;strong>&59;Key words&58;<&59;/strong>&59; Enzymic activity-arylsulphatase, andisol, <&59;em>&59;Musa<&59;/em>&59; ABB<&59;/p>&59;&60;br&62;<&59;p align&61;"justify">&59;En la zona central cafetera de Colombia, en un suelo <&59;em>&59;Pachic Melanudands medial isot&&59;eacute&59;rmico<&59;/em>&59;, se midi&&59;oacute&59; la actividad de arilsulfatasa en rizosfera de pl&&59;aacute&59;tano <&59;em>&59;Musa<&59;/em>&59; AAB, en tres sistemas de manejo agron&&59;oacute&59;mico (qu&&59;iacute&59;mico o convencional, tradicional y ecol&&59;oacute&59;gico), cuatro profundidades (0-5, 5-10, 10-20 y 20-30 cm) y tres edades de cultivo (6 meses &&59;ndash&59; diferenciaci&&59;oacute&59;n floral, 12 meses &&59;ndash&59; floraci&&59;oacute&59;n, 18 meses - cosecha). La mayor actividad (60%) se encontr&&59;oacute&59; en los primeros 10 cm., y disminuy&&59;oacute&59; a medida que se profundiz&&59;oacute&59; en el perfil del suelo. El an&&59;aacute&59;lisis estad&&59;iacute&59;stico no mostr&&59;oacute&59; diferencias significativas entre los tres manejos o entre edades de planta. La actividad de arilsulfatasa se encontr&&59;oacute&59; entre 164 &&59;micro&59; mol g-1 min-1 y 319 &&59;micro&59; mol g-1 min-1. La m&&59;aacute&59;s baja actividad se observ&&59;oacute&59; en la rizosfera de plantas de 12 meses (floraci&&59;oacute&59;n) y con manejo qu&&59;iacute&59;mico. La actividad de este enzima correlacion&&59;oacute&59; muy significativamente con biomasa microbiana carbono (BMC) y muy significativamente con el contenido de Mg, n&&59;uacute&59;mero de hojas emitidas y peso del racimo de pl&&59;aacute&59;tano.<&59;/p>&59;<&59;p align&61;"justify">&59;<&59;strong>&59;Palabras clave&58;<&59;/strong>&59; <&59;em>&59;Musa<&59;/em>&59; ABB. Actividad enzim&&59;aacute&59;tica - arilsulfatasa, andisol, <&59;/p>&59;