Use of alkaline flyash-based products to amend acid soils: Extractability of selected elements and their uptake by plants

Spark, K. M. and Swift, R. S. (2008) Use of alkaline flyash-based products to amend acid soils: Extractability of selected elements and their uptake by plants. Australian Journal of Soil Research, 46 7: 585-599. doi:10.1071/SR07210


Author Spark, K. M.
Swift, R. S.
Title Use of alkaline flyash-based products to amend acid soils: Extractability of selected elements and their uptake by plants
Journal name Australian Journal of Soil Research   Check publisher's open access policy
ISSN 0004-9573
Publication date 2008-10-08
Sub-type Article (original research)
DOI 10.1071/SR07210
Volume 46
Issue 7
Start page 585
End page 599
Total pages 15
Place of publication Sydney, Australia
Publisher CSIRO Publishing
Language eng
Subject C1
961203 Rehabilitation of Degraded Forest and Woodlands Environments
070199 Agriculture, Land and Farm Management not elsewhere classified
0701 Agriculture, Land and Farm Management
Abstract In addition to promoting plant growth, the incorporation of flyash material into soil also has the potential to affect the solubility and plant availability of some elements. This paper reports on the effect of 2 flyash products (FAP) on the extractability and plant uptake as a function of pH of selected elements of concern in the environment: As, B, Cd, Co, Cu, Cr, Mn, Pb, Ni, and Zn. The results for the growth response of maize plants (Zea mays L.) in the FAP-amended soils have been reported in a companion paper. The addition of the FAP to the soils used in this study at rates up to 5% w/w resulted in increased levels of Cu, Mn, Ni, As, and Co in an acetic acid extract. The levels of Cr, Mn, Ni, Pb, Zn, As, and Co in these extracts all showed a dependency on pH for some soils. Maize plants grown in the amended soils exhibited an increase in the plant uptake of Cu, Mn, and Ni in some soils. However, none of the elements studied increased the plant uptake to levels which would generally be considered toxic to plants or cause problems in the food chain. The presence of the FAP decreased the plant availability of Ni at low pH and levels of Mn and Cd in the acetic acid extract were decreased, most likely due to sorption of these elements by the FAP. There is no evidence that either the flyash alone, or the 2 FAP used in this study would pose a threat to plants or the environment when used at levels of up to 5% w/w. Possible beneficial effects for the environment were observed as the incorporation of FAP into soils has the capacity to reduce the uptake and potential toxicity of Cd, Ni, or Mn in some soils.
Keyword Flyash
Soil acidity
Soil amendments
Acetic acid extract
Plant uptake
Contaminants
Q-Index Code C1
Q-Index Status Confirmed Code

 
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Created: Fri, 17 Apr 2009, 04:52:40 EST by Emma Cushworth on behalf of Faculty Of Nat Resources, Agric & Veterinary Sc