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Soil sorption-desorption of phosphorus from piggery effluent compared with inorganic sources

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Redding, M. R., Shatte, T. and Bell, K. L. (2006) Soil sorption-desorption of phosphorus from piggery effluent compared with inorganic sources. European Journal of Soil Science, 57 (2). pp. 134-146.

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Article Link: http://dx.doi.org/10.1111/j.1365-2389.2005.00722.x

Publisher URL: http://www3.interscience.wiley.com/cgi-bin/home


The leaching of phosphorus (P) within soils can be a limiting consideration for the sustainable operation of intensive livestock enterprises. Sorption curves are widely used to assist estimation of P retention, though the effect of effluent constituents on their accuracy is not well understood. We conducted a series of P-sorption-desorption batch experiments with an Oxic Haplustalf (soil 1), Haplusterts (soils 2 and 3), and a Natrustalf (soil 4). Phosphorus sources included effluent, orthophosphate-P in a matrix replicating the effluent's salt constituents (the reference solution), and an orthophosphate-P solution. Treated soils were incubated for up to 193 days before sequential desorption extraction. Effluent constituents, probably the organic or particulate components, temporarily increased the vulnerability of sorbed-P to desorption. The increase in vulnerability was removed by 2-113 days of incubation (25 degrees C). Despite vigorous extraction for 20 consecutive days, some P sorbed as part of the treatments of soils 1 and 2 was not desorbed. The increased vulnerability due to effluent constituents lasted a maximum of about one cropping season and, for all other treatments, adsorption curves overestimated vulnerability to desorption. Therefore, adsorption curves provide a conservative estimate of vulnerability to desorption where effluent is used in continued crop production in these soils.

Item Type:Article
Business groups:Animal Science, Crop and Food Science
Additional Information:© British Society of Soil Science.
Keywords:Organic-matter; phosphate sorption; adsorption; time; competition; manures; anions; land.
Subjects:Animal culture > Swine
Agriculture > Agriculture (General) > Soils. Soil science
Live Archive:03 Feb 2009 06:43
Last Modified:28 Oct 2021 05:04

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