The effect of biosolids on cereals in central New South Wales, Australia. 2. Soil levels and plant uptake of heavy metals and pesticides
J. L. CooperNSW Agriculture, Agricultural Research Centre, Trangie, NSW 2823, Australia; present address for correspondence: PO Box 163, Narromine, NSW 2821, Australia. Email: cooperj@tpg.com.au
Australian Journal of Experimental Agriculture 45(4) 445-451 https://doi.org/10.1071/EA03100
Submitted: 25 May 2003 Accepted: 29 November 2004 Published: 23 May 2005
Abstract
Two forms of biosolids, with and without lime, were applied to acid soils at 2 sites growing wheat and triticale in central New South Wales. The forms of biosolids used were dewatered sewage sludge cake, and N-Viro Soil which is a lime-amended sewage sludge. Dewatered sewage sludge cake was applied at rates of 0, 6, 12 and 24 dry Mg/ha, and N-Viro soil at 0, 1.5, 3.0 and 4.5 dry Mg/ha. The soil was sampled and analysed at 2 points in time to determine the effect of the biosolids on heavy metal concentrations. Vegetative plant material and grain were also analysed for heavy metal and organo-chlorine pesticide levels.
Zinc and copper concentrations increased significantly with the addition of biosolids, especially with the highest rates of dewatered sewage sludge cake. However, all soil heavy metals were below the maximum allowable soil contaminant concentrations set by Environment Protection Authority, NSW. Cereal species, the addition of lime, and biosolids each affected heavy metal concentrations in plant material, but the responses differed between sites. Also, the changes in heavy metal concentrations in plant material were smaller and less consistent than the changes in soil heavy metal concentrations. The maximum heavy metal concentrations in grain were all below the maximum permitted concentrations of Food Standards Australia New Zealand. There were no detectable changes in the levels of organo-chlorine pesticides in the grain.
Additional keywords: acid soil, lime, sewage sludge.
Acknowledgments
The technical assistance of Mr A. Holmes, Mr R. Pither and Mr I. Bamforth in conducting the trials is greatly appreciated. This work would not have been possible without the financial assistance of NSW Agriculture Sludge Applications Program and Sydney Water.
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