บทคัดย่องานวิจัย

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Phytoavailability and extractability of copper and zinc in calcareous soil amended with composted urban wastes.

Gallardo-Lara, F.; Azcon, M.; Quesada, J. L.; Polo, A.;

Journal of Environmental Science and Health. Part B, Pesticides, Food Contaminants, and Agricultural Wastes Year: 1999 Vol: 34 Issue: 6 Pages: 1049-1064 Ref: 48 ref.

1999

บทคัดย่อ

Phytoavailability and extractability of copper and zinc in calcareous soil amended with composted urban wastes.

A greenhouse experiment was conducted under simulated field conditions using large-capacity plastic pots, filled each one with 25 kg of air-dried calcareous soil. Besides the control, four treatments were prepared by applying separately two rates (20 and 80 t ha-1) of municipal solid wastes (MSW) compost, and co-composted municipal solid waste and sewage sludge (MSW-SS). Lettuce was planted and harvested 2.5 months later. The application of composted urban wastes increased Cu concentration in lettuce with respect to the control, but it was only significant when the higher rate of MSW compost was applied. The control showed values of Zn concentration in plant within a deficient range. In general, composted urban wastes treatments had increased Zn concentration values, which were within the sufficiency range. Both treatments with MSW compost increased Cu and Zn uptake in comparison with MSW-SS co-compost treatments. At the postharvest, all composted urban wastes treatments increased significantly

DTPA-extractable Cu content in soil with respect to the control; the increase in AAAc-EDTA-extractable Cu in soil produced by the addition of the higher rate of MSW compost was also significant. The application of composted urban wastes increased significantly DTPA-extractable and AAAc-EDTA-extractable Zn contents in soil vs. the control, except for the lower rate of MSW-SS co-compost. The values of DTPA-extractable/total ratio for Cu and Zn were <10%, except for the treatment applying the higher rate of MSW compost which promoted higher values. The values of AAAc-EDTA-extractable/total ratio for Cu were >10% in all treatments including the control. This tendency was also observed in AAAc-EDTA-extractable/total ratio for Zn when applying both rates of MSW compost or the higher rate of MSW-SS co-compost.