Fertilisation with biosolids in a silvopastoral system established with Pseudotsuga menziesii (Mirb.) Franco in Galicia (NW Spain)

Autor: Antonio Rigueiro-Rodríguez, N. Ferreiro-Domínguez, M. R. Mosquera-Losada
Rok vydání: 2018
Předmět:
Zdroj: Agroforestry Systems. 95:881-893
ISSN: 1572-9680
0167-4366
DOI: 10.1007/s10457-018-0291-x
Popis: In Europe, sewage sludge has to be stabilised before its use as fertiliser in agricultural land. Stabilisation processes can cause differences in the concentration of heavy metals in sewage sludge, such as that of zinc (Zn), one of the heavy metals with the highest proportion in sewage sludge. This study was undertaken to examine during a five-year period the effects of fertilisation with different types of sewage sludge (anaerobic, composted, and pelletised) on the concentration of total and available Zn in the soil, tree growth, pasture production, and concentration of Zn in the pasture when compared to control treatments (i.e. no fertilisation and mineral fertilisation) in a silvopastoral system (SS) under Pseudotsuga menziesii (Mirb.). The results of this experiment revealed that pelletised sewage sludge enhanced the levels of Zn in soil and pasture and the production of pasture without reducing the tree growth. Therefore, the use of this type of sewage sludge as organic fertiliser should be promoted in SSs established under tree species and edaphoclimatic conditions similar to those in this study. Moreover, regardless of the type of sludge used for fertilisation, the levels of Zn in the soil never exceeded the maximum values set by Spanish regulations and did not cause harmful effects on plants and animals.
Databáze: OpenAIRE
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