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Descripción
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| Raña formations are a common occurrence in the landscape of SW Spain, where they span wide areas hundreds of square kilometers in size, which act as watershed divides. They were formed in the Middle-Upper Pliocene and support very old and highly weathered soils, whose properties have resulted mostly from the action of a pre-Quaternary climate with subtropical features (Espejo, 1987). Agriculturally, raña soils are very poor and subjected to a number of severe constraints as regards exploitation due to the effect of their poor Ca, Mg, K and P availability, and high Al contents in the exchange complex (Espejo, 1987; Peregrina et al., 2006). In the 1930¿s and 1940¿s, most of the natural vegetation on these surfaces was cleared for agricultural use. Tillage of these virgin soils increased the mineralization rate of the organic matter (SOM) and, as a result, after several decades of crop production, the soils evolved from Palehumults to Palexerults (Soil Survey Staff, 2003). The loss of SOM , and the extraction of bases by crops further reduced the already low productivity of these soils, reducing nutrient bioavailability and the Ca/Al ratio, with the latter causing an increase in Al toxicity (Mariscal-Sancho et al., 2009). This led to most of the tilled fields being abandoned within 20-50 years of clearing. Any regeneration or rehabilitation measure to be adopted for these degraded soils should consider preliminary liming, in order to increase base saturation in the exchange complex, raise the Ca/Al ratio, and encourage the success of conservative management practices, which promote the accumulation of OM and the storage base capacity. The objective of this work was to evaluate the incidence on the exchange complex of the application of lime amendments in the form of sugar foam waste (sugar-manufacturing residue), alone or accompanied by another industrial bye product like phosphogypsum, the latter with the aim of supplying Ca to the subsurface horizons as gypsum is more soluble than lime. The effect on the biomass production was studied through the yield of a forage crop. | |
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Internacional
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Si |
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Nombre congreso
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14th Ramiran |
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Tipo de participación
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960 |
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Lugar del congreso
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Lisboa, Portugal |
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Revisores
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Si |
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ISBN o ISSN
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978-972-8669-47-8 |
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DOI
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Fecha inicio congreso
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13/09/2010 |
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Fecha fin congreso
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15/09/2010 |
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Desde la página
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0 |
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Hasta la página
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0 |
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Título de las actas
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Libro de actas del congreso |