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Changes in soil organic matter, enzymatic activities and heavy metal availability induced by application of organic residues

AutorBurgos, Pilar ; Madejón, Engracia ; Cabrera, Francisco
Fecha de publicación2002
CitaciónDevelopments in Soil Science 28(B): 353-362 (2002)
ResumenA 3-year field experiment on a sandy soil supporting a strawberry crop was carried out to study the effects of the application of three organic residues (AC, olive mill wastewater sludge compost; MWC, municipal solid waste compost; and PW, paper mill waste) on organic matter content, enzymatic activities, and available heavy metals. Significant increases in organic carbon content (total organic carbon (TOC), total extractable carbon (TEC) and humic acid carbon (HAC)) were observed in soils, depending on fue nature of organic amendments. The application of the organic residues also caused significant increases in dehydrogenase, phosphatase, β-glucosidase, urease and BAA-protease activities. This favourable effect on soil biological activity was more noticeable in MWC and PW treatments. Significant positive correlation (p < 0.01) between enzymatic activities and total organic carbon was found for all treatments. Available heavy metal contents increased slightly in fue soils treated with MWC and PW but did not affect negatively soil enzymatic activities. A discriminant analysis generated two functions (F1 and F2) based on linear contributions offue variables (TOC, TEC, RAC, DHase, Phosp,β-glu, Ure, and BAA). F1 is correlated with DH-ase, TOC and BAA and separates treatments C and AC from PW and MWC. F1 underlines the effect of the higher doses of organic matter applied with MWC and PW. F2 is correlated with humic substances (TEC and RAC), and β-glu separates treatments C and PW from AC and MWC. This function shows the difference of the effect of composted (AC and MWC) and fresh residues (PW) on soil properties. Results showed that the application of organic residues to a sandy soil improves its agronomic quality by increasing soil organic matter and enhancing soil enzyme activities.
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