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Advisor(s)
Abstract(s)
In Galicia (northwestern Spain), the soils tend to be acidic mainly due to the region’s humid climate, the prevalence of subtractive systems, frequent fires and, often, acidic parent material which can limit the tree growth and the pasture production in the silvopastoral systems. Therefore, it is advisable to carry out management techniques and fertilisation to improve soil fertility as well as the pasture and tree productivity. The objective of this experiment was to compare the effect of no fertilisation, three doses of sewage sludge (160, 320 and 480 kg N total ha-1), with or without liming (2.5 t CaCO3 ha–1), and the mineral fertilisation usually used in the region (8% N – 24% P2O5 – 16% K2O) on tree growth in a silvopastoral system established on an acidic forest soil with Pinus radiata D. Don in 1997. In the first years of the study, the results showed an increase of tree growth in the limed plots probably due to the reduction in the Al saturation percentage in the soil exchange complex. However, 12 years after the addition of lime and 9 years after the fertilisation with sewage sludge, the Al saturation percentage in the soil exchange complex was similar to that observed at the beginning of the study which decreased the tree growth in all plots and significant differences between treatments were not observed. Therefore, it is necessary to maintain an adequate regime of soil fertility to guarantee a sustainable growth of the forest stand.
Description
Poster
Keywords
Pinus radiata silvopastoral system