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Related Experiment Videos

Source-separated municipal solid waste compost application to Swiss chard and basil.

Valtcho D Zheljazkov1, Philip R Warman

  • 1Department of Plant and Animal Sciences, Nova Scotia Agricultural College, PO Box 550. Truro, NS, B2N 5E3 Canada. vjeliazkov@nsac.ns.ca

Journal of Environmental Quality
|April 13, 2004
PubMed
Summary

Source-separated municipal solid waste (SSMSW) compost can improve soil health for crops like basil and Swiss chard. While it increases metal concentrations, it remains safe for plants and doesn't elevate crop tissue metal levels significantly.

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Area of Science:

  • Environmental Science
  • Agronomy
  • Soil Science

Background:

  • Municipal solid waste compost can be a valuable soil amendment.
  • Understanding the bioavailability and plant uptake of metals from compost is crucial for sustainable agriculture.

Purpose of the Study:

  • To evaluate the bioavailability of essential and heavy metals from source-separated municipal solid waste (SSMSW) compost in soil.
  • To assess the impact of SSMSW compost on crop yield and metal accumulation in basil and Swiss chard.
  • To determine the fractionation of copper (Cu), lead (Pb), and zinc (Zn) in soil amended with SSMSW compost.

Main Methods:

  • Growth room experiment using sandy loam soil amended with 0-60% SSMSW compost.
  • Cultivation of basil (Ocimum basilicum L.) and Swiss chard (Beta vulgaris L.).

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  • Sequential extraction to fractionate Cu, Pb, and Zn into exchangeable (EXCH), iron- and manganese-oxide-bound (FeMnOX), organic-matter (OM), and structurally bound (SB) forms.

    • Main Results:

    • SSMSW compost increased soil pH, electrical conductivity (EC), and concentrations of Cu, Pb, and Zn in most soil fractions.
    • Basil yield was highest at 20% compost, while Swiss chard showed increased yield across all compost treatments.
    • Crop tissue analysis indicated that metal concentrations remained within normal ranges, and basil essential oil was metal-free.

    Conclusions:

    • Mature SSMSW compost can be used as a soil conditioner without causing phytotoxicity or significantly increasing metal levels in crops.
    • Long-term monitoring of heavy metal accumulation in soils is recommended.
    • Compost application influences metal bioavailability and plant nutrient uptake.