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This study was conducted in the coffee growing zone of Valle del Cauca Colombia to evaluate the effect of planting coffee under different cropping systems: organic, conventional and organic-mineral, on soil phosphorus P fractions.  Adapted sequential fractionation methodology was done by the International Center of Tropical Agriculture.  The statistical analysis consisted of a Complete Randomized Block Design under a split plot arrangement with three treatments and three replications.  The results showed that contents of the organic fraction of available P and the moderately available P had significant differences P andgt; 0.5 among the conventional and organic systems, in which the conventional system had the lowest values. The organic-mineral system showed the highest contents of organic and inorganic P and the conventional system showed the lowest for these fractions of P.  For the non-available P fraction, it was found that organic systems had higher P content than the conventional system and, the organic-mineral system showed significant differences with respect to the rest. Total P showed a similar pattern than the fractions described above.  The low content in the conventional system can be explained by specific aspects of management such as the use of synthetic chemical fertilizers, planting in monoculture without shade and lack of soil coverage between plants., El trabajo tuvo como objetivo evaluar la influencia de los sistemas de siembra de caé: orgãnico, convencional y orgánico-mineral, sobre las fracciones de fósforo P en suelos del departamento del Valle del Cauca, Colombia. Las mediciones por fraccionamiento secuencial adaptado se hicieron en el Laboratorio de Suelos del Centro Internacional de Agricultura Tropical CIAT. El análisis estadístico se ajustó a un modelo de diseño completamente aleatorio en un arreglo en parcelas divididas con tres tratamientos y tres repeticiones. Los resultados mostraron que los contenidos de las fracciones orgánica de P disponible y P moderadamente disponible variaron P andlt; 0.05 entre los sistemas de manejo orgánico y el convencional, este último, presentó los valores más bajos. El sistema orgánico-mineral mostró los mayores contenidos de P orgánico e inorgánico, y el sistema convencional presentó los valores más bajos de ambas fracciones de P. La fracción de P no-disponible fue más alta en los sistemas orgánicos comparado con el sistema convencional, mientras que en el sistema orgánico mineral se encontraron diferencias P andlt; 0.05 con respecto a los restantes sistemas. El P total mostró un comportamiento similar al de las fracciones. Los bajos contenidos de P en el sistema convencional se deben, posiblemente, a prácticas de manejo, como el uso de fertilizantes de síntesis química, la siembra a libre exposición en monocultivo y la ausencia de coberturas entre plantas.

Tipo de documento: Artículo - Article

Palabras clave: Cultivo de café, fraccionamiento de fósforo, sistemas de cultivo, suelos con influencia volcánica, Coffee crop, cropping systems, phosphorus fractions, soils with volcanic influence





Fuente: http://www.bdigital.unal.edu.co


Introducción



Research article Phosphorus fractions in Valle del Cauca soils under different coffee cropping systems Fracciones de fósforo en suelos del Valle del Cauca con diferentes sistemas de cultivo de café Diana Milena Mejía-Umaña*, Diego Iván Ángel-Sánchez†, and Juan Carlos Menjivar-Flores‡ Department of Agricultural Sciences, Universidad Nacional de Colombia - Palmira, AA.
237.
Palmira, Valle del Cauca, Colombia. *Corresponding author: dmmejiau@unal.edu.co; †dangels@unal.edu.co; ‡jcmenjivarf@unal.edu.co Rec.: 24.03.11 Acept.: 29.11.11 Abstract This study was conducted in the coffee growing zone of Valle del Cauca (Colombia) to evaluate the effect of planting coffee under different cropping systems: organic, conventional and organic-mineral, on soil phosphorus (P) fractions.
Adapted sequential fractionation methodology was done by the International Center of Tropical Agriculture.
The statistical analysis consisted of a Complete Randomized Block Design under a split plot arrangement with three treatments and three replications.
The results showed that contents of the organic fraction of available P and the moderately available P had significant differences (P 0.5) among the conventional and organic systems, in which the conventional system had the lowest values.
The organic-mineral system showed the highest contents of organic and inorganic P and the conventional system showed the lowest for these fractions of P.
For the non-available P fraction, it was found that organic systems had higher P content than the conventional system and, the organic-mineral system showed significant differences with respect to the rest.
Total P showed a similar pattern than the fractions described above.
The low content in the conventional system can be explained by specific aspects of management such as the use of synthetic chemical fertilizers, planting in monoculture without shade and lack of soil coverage between plants. Key words: Coffee crop, cropping systems, phospho...






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