Please use this identifier to cite or link to this item:
|Title:||Do Decomposing Organic Matter Residues Reduce Phosphorus Sorption in Highly Weathered Soils?||Contributor(s):||Guppy, C (author) ; Menzies, NW (author); Blamey, FPC (author); Moody, PW (author)||Publication Date:||2005||DOI:||10.2136/sssaj2004.0266||Handle Link:||https://hdl.handle.net/1959.11/328||Abstract:||Many studies have shown a reduction in P sorption in highly weathered soils when organic matter (OM) is applied, suggesting competition between OM decomposition products and P for sorption sites. However, such studies seldom consider the P released from the added OM. To delineate the effects of OM addition on P availability through sorption competition and P addition, water leachate from incubated soybean (SB) [Glycine max (L.) Merr.] and Rhodes grass (RG) (Chloris gayana Kunth cv. Callide) was used in competitive P sorption studies both undiluted and after acidification (i.e., the fulvic acid [FA] component). Addition of two rates (0.2 and 2 mL) of SB leachate to an Oxisol significantly increased P sorption at the higher rate, while a similar trend was observed following RG leachate addition at the same rates. Extending the range of highly weathered soils examined (two Oxisols, an Ultisol, and an acidic Vertisol) resulted in no observed decrease in P sorption following addition of OM leachate. Surprisingly, SB leachate transiently increased P sorption in the two Oxisol soils. Addition of the FA component of the leachates resulted in a transient (<6 d) decrease in P sorption in three of the four soils examined and constituted the only evidence in this study that decomposing OM residues reduced P sorption. This research provides further evidence contradicting the long held assumption that inhibition of P sorption by dissolved organic compounds, derived from decomposing OM, is responsible for increased P phytoavailability when P fertilizer and OM are applied together.||Publication Type:||Journal Article||Source of Publication:||Soil Science Society of America Journal, 69(5), p. 1405-1411||Publisher:||Soil Science Society of America||Place of Publication:||USA||ISSN:||0361-5995||Field of Research (FOR):||050304 Soil Chemistry (excl Carbon Sequestration Science)||Peer Reviewed:||Yes||HERDC Category Description:||C1 Refereed Article in a Scholarly Journal||Statistics to Oct 2018:||Visitors: 63
|Appears in Collections:||Journal Article|
Files in This Item:
checked on Nov 26, 2018
checked on Dec 29, 2018
Items in Research UNE are protected by copyright, with all rights reserved, unless otherwise indicated.