An assessment of various measures of soil phosphorus and the net accumulation of phosphorus in fertilized soils under pasture

Simple item page
dc.contributor.authorMclaren, T.
dc.contributor.authorSimpson, R.
dc.contributor.authorMclaughlin, M.
dc.contributor.authorSmernik, R.
dc.contributor.authorMcbeath, T.
dc.contributor.authorGuppy, C.
dc.contributor.authorRichardson, A.
dc.date.issued2015
dc.description.abstractPhosphorus fertilizer use efficiency of pastures is often low because P accumulates in soils as sparingly-available forms of inorganic and organic P. The aim of this study was to use sequential chemical fractionation to identify which forms of P have accumulated in soil under permanent pasture from a medium-term (13 y) field experiment. Treatments included an unfertilized pasture (P0), and treatments designed to maintain soil P fertility at near ‘optimum’ (P1) and ‘supra-optimum’ (P2) levels for pasture growth; all levels of soil P fertility were continuously grazed with either a moderate or high stocking rate (SR09 and SR18). Summed concentrations of extractable inorganic and organic P, and residual P (i.e., non-extractable P) accounted for 20, 31, and 49% of total soil P (as determined by laboratory X-ray fluorescence), respectively, across all surface (0–10 cm) and subsurface (10–20 cm) soil layers. A large proportion of extractable inorganic and organic P was contained in the NaHCO3 and NaOH soluble fractions across all surface soil layers, and these fractions were also the most important sinks for fertilizer P. The accumulation of organic P appeared to plateau with increasing fertilizer addition, whereas inorganic P continued to increase. The majority of the P that had been applied as fertilizer (70%) was recovered in the surface soil layer (0–10 cm). Approx. 31 and 30% of the added P was recovered in the summed concentrations of extractable inorganic and organic P, respectively, of the surface soil layer at the optimum (P1) agronomic level of soil P fertility.
dc.description.statementofresponsibilityTimothy I. McLaren, Richard J. Simpson, Michael J. McLaughlin, Ronald J. Smernik, Therese M. McBeath, Christopher N. Guppy, and Alan E. Richardson
dc.identifier.citationJournal of Plant Nutrition and Soil Science, 2015; 178(4):543-554
dc.identifier.doi10.1002/jpln.201400657
dc.identifier.issn1436-8730
dc.identifier.issn1522-2624
dc.identifier.orcidMclaughlin, M. [0000-0001-6796-4144]
dc.identifier.orcidSmernik, R. [0000-0001-6033-5855]
dc.identifier.orcidMcbeath, T. [0000-0001-6423-367X]
dc.identifier.urihttp://hdl.handle.net/2440/93651
dc.language.isoen
dc.publisherWiley-VCH Verlag
dc.rights© 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
dc.source.urihttps://doi.org/10.1002/jpln.201400657
dc.subjectImproved grasslands; phosphorus dynamics; phosphorus use efficiency; sequential chemical fractionation; superphosphate
dc.titleAn assessment of various measures of soil phosphorus and the net accumulation of phosphorus in fertilized soils under pasture
dc.typeJournal article
pubs.publication-statusPublished

Files

Collections

Agriculture, Food and Wine publications