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Evolution of forest soil properties after liming with a by‑product derived from a sugar beet mill

AutorGonzález, Isabel M.; Gallardo, Juan F. ; Egido, José A.; Obrador, José J.
Palabras claveForest ecosystem
Oak stands
Quercus pyrenaica
Acid soils
Fecha de publicación2016
CitaciónChemical and Biological Technologies in Agriculture 3(26): (2016)
ResumenDeciduous oak coppices (Quercus pyrenaica Willd.) of the “Sierra de Gata” mountains (central western Spain) are located on acid rocks and subjected to annual rainfall higher than 700 mm year−1. Accordingly, the soils are acidic (soil pH is often below 5.0) and feature the presence of Mn2+ and Al3+ in the exchangeable complex. The aim of the present study was to assess the response of these soils to the addition of a lime residue from a sugar beet mill to reach pH values close to 7.0 and 6.0 with in situ and in vitro experiments, respectively. Initially, the quality of the lime by-product was evaluated, which showed content close to 75 % CaCO3. Based on that analysis, calculations were accomplished to determine the dose of lime by-product necessary for achieving the targeted soil pH. We first performed an in vitro liming experiment, incubating 0.50 kg soil (0–20 cm layer) with 23.92 g CaCO3 kg−1 soil (20 °C and soil moisture equivalent to that of field capacity). Subsequently, another experiment was done adding an equivalent quantity of sub-product in lieu of the pure CaCO3; the factors monitored were: soil pH, exchange acidity, CEC, and exchangeable bases, every 24 h. The in situ experiment was performed in a forest plot located in Western Spain (Navasfrías), liming with 16.0 Mg DM by-product ha−1 (September 1999). Soil samples (two depths: 0–10 and 10–20 cm) were taken from both the control and the experimental forest plots for monitoring the liming effect. Sampling dates were September and December 1999; June 2000, January, June and September 2001; October 2002 and 2003, and March 2005). The dissolution of the lime by-product at the laboratory was almost immediate, but the effects in the field occurred approximately 2 years after initial liming, since lime dissolution depends on both the amount and distribution of rainfall and, also, on the application procedure.
Descripción5 tablas, 1 figura.
Versión del editorhttp://dx.doi.org/10.1186/s40538-016-0078-0
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