Acta Agronómica (Jul 2011)
Fracciones de fósforo en suelos del Valle del Cauca con diferentes sistemas de cultivo de café Phosphorus fractions in soils of the Valle del Cauca under different coffee crop systems
Abstract
El trabajo tuvo como objetivo evaluar la influencia de los sistemas de cultivo de café: orgánico, convencional y orgánico-mineral, sobre las fracciones de fósforo (P) en suelos del departamento del Valle del Cauca, Colombia. Las mediciones por fraccionamiento secuencial reducido 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 orgánicas de P disponible y P moderadamente disponible variaron (P This study was conducted in the department of Valle del Cauca (Colombia) coffee growing zone to evaluate the response of planting coffee under different cropping systems: organic, conventional and organicmineral, on soil phosphorus fractions with volcanic influence. Sequential fractionation methodology adapted by the International Center of Tropical Agriculture was used. 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 showed significant differences among the systems in which organic and conventional management was included, the conventional system had the lowest values. The organic-mineral system showed the highest contents of organic and inorganic phosphorus 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. The total P showed a similar pattern to the fractions described. The low content in the conventional system can be explained by specific aspects of management such as the use of synthetic chemical fertilizers, planting without shade in monoculture and lack of soil coverage between plants.
