Phosphorus storage on effluent irrigated land

Menzies, N. W., Skilton, J. A. and Guppy, C. N. (1999) Phosphorus storage on effluent irrigated land. Journal of Environmental Quality, 28 3: 750-754. doi:10.2134/jeq1999.00472425002800030003x


Author Menzies, N. W.
Skilton, J. A.
Guppy, C. N.
Title Phosphorus storage on effluent irrigated land
Journal name Journal of Environmental Quality   Check publisher's open access policy
ISSN 0047-2425
1537-2537
Publication date 1999-05
Sub-type Article (original research)
DOI 10.2134/jeq1999.00472425002800030003x
Volume 28
Issue 3
Start page 750
End page 754
Total pages 5
Place of publication Madison, WI, U.S.A.
Publisher American Society of Agronomy
Collection year 1999
Language eng
Subject C1
300103 Soil Chemistry
770602 Land and water management
Formatted abstract
Land disposal of secondary treated sewage effluent is being widely adopted in Australia as an alternative to tertiary treatment. At the Cleveland Waste Water Pollution Control Works, effluent has been applied to a Hapludalf at high rates (3000 mm yr−1) for more than 20 yr, adding an estimated 4.5 t P ha−1 to the soil. Thus, this site provides an opportunity to assess the retention of P under conditions typical of southeast Queensland. Laboratory chemical fractionation and P sorption studies of effluent irrigated and control sites were undertaken to determine the amount and forms of P retained within this soil and its capacity to retain further P. Organic material (peat) which had accumulated on the surface of effluent irrigated plots, was also sampled and its P content determined. Accumulation of P was limited to the sandy surface soil, increasing total soil P content by ≈ 700 kg ha−1, with this increase being approximately evenly distributed between inorganic and organic pools. The excessive irrigation rate used on this site, and the management adopted, has resulted in a marked podzolization of the surface horizon, apparent in reduced extractable Fe and Al concentrations. The removal of these P adsorbing materials would contribute, along with P saturation and organic ligand competition, to the much lower P sorption capacity of irrigated sites relative to the control. The largest P pool was found to be the peat layer, containing approximately 1500 kg P ha−1. On this site P has accumulated principally in organic forms, both within the soil and as peat on its surface. This finding throws into question the common practice of predicting disposal scheme life on the basis of P adsorption curves.
Keyword Environmental Sciences
Secondary
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Agriculture and Food Sciences
 
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Created: Tue, 10 Jun 2008, 14:56:41 EST