Show simple item record

dc.contributor.authorDodd, Rosalind
dc.contributor.authorMcDowell, Richard
dc.contributor.authorCondron, Leo M.
dc.date.accessioned2018-05-01T01:22:10Z
dc.date.available2012-03-08en
dc.date.issued2012-06
dc.identifier.issn0266-0032en
dc.identifier.urihttps://hdl.handle.net/10182/9299
dc.description.abstractPhosphorus (P) loss from soil can impair surface water quality. Losses from soil are related to soil P concentrations, but agronomic measures such as Olsen P do not in many cases predict the potential for P loss. One possible strategy to decrease P loss is to stop applying P fertilizers. We examined the changes in both agronomic (Olsen P) and environmental [water-extractable P (WEP) and calcium chloride-extractable P (CaCl₂-P)] P tests, and the potential implications following a halt to P fertilizer application to four long-term grassland field trials on different soil types. Exponential decreases in Olsen P and WEP concentration over time were observed in three of the four trials, but only in one trial for CaCl₂-P. The rates of decrease in Olsen P (OP) and WEP concentration were best correlated with initial WEP (WEPi) concentration and the quotient of Olsen Pi⁄P retention (PR, a measure of Al- and Fe-oxides), respectively. The equation t = 1⁄(–0.035 x ln OPi⁄PR – 0.0455) x (ln WEPt – ln WEPi) was used to predict the time (t) taken for WEP concentrations at the sites to decrease to 0.02 mg⁄L (WEPt), which is proposed as a limit for dissolved reactive phosphorus in overland flow, and the result was 23–44 yr. Results from a similar equation for Olsen P predicted a quicker rate of WEP. A significant decline in dry matter (DM) yield was observed at one trial site. For this site, the rate of decline in DM yield was of a similar magnitude to the rate of decline in WEP concentration. This suggests that halting P fertilizer application to decrease P loss as measured by WEP concentration may decrease farm productivity. An alternative, more financially acceptable, strategy is required, such as a negative P balance while maintaining yields with N fertilizer, but further work is required to assess both the agronomic and environmental implications of this strategy.en
dc.format.extent135-147en
dc.language.isoen
dc.publisherWiley on behalf of the British Society of Soil Science
dc.relationThe original publication is available from - Wiley on behalf of the British Society of Soil Science - https://doi.org/10.1111/j.1475-2743.2012.00390.xen
dc.relation.urihttps://doi.org/10.1111/j.1475-2743.2012.00390.xen
dc.rights© 2012 The Authors. Journal compilation © 2012 British Society of Soil Science.
dc.subjectproductivityen
dc.subjectsoil test phosphorusen
dc.subjectsuperphosphateen
dc.subjectwater qualityen
dc.subjectAgronomy & Agricultureen
dc.titlePredicting the changes in environmentally and agronomically significant phosphorus forms following the cessation of phosphorus fertilizer applications to grasslanden
dc.typeJournal Article
lu.contributor.unitLincoln University
lu.contributor.unitFaculty of Agriculture and Life Sciences
lu.contributor.unitDepartment of Soil and Physical Sciences
dc.identifier.doi10.1111/j.1475-2743.2012.00390.xen
dc.subject.anzsrc0503 Soil Sciencesen
dc.subject.anzsrc05 Environmental Sciencesen
dc.subject.anzsrc0703 Crop and Pasture Productionen
dc.relation.isPartOfSoil Use and Managementen
pubs.issue2en
pubs.notesDate of acceptance: January 2012en
pubs.organisational-group/LU
pubs.organisational-group/LU/Agriculture and Life Sciences
pubs.organisational-group/LU/Agriculture and Life Sciences/SOILS
pubs.organisational-group/LU/Research Management Office
pubs.organisational-group/LU/Research Management Office/QE18
pubs.publication-statusPublisheden
pubs.volume28en
dc.identifier.eissn1475-2743en
lu.identifier.orcid0000-0002-3082-994X
lu.identifier.orcid0000-0003-3911-4825
lu.identifier.orcid0000-0001-8970-2460


Files in this item

Default Thumbnail

This item appears in the following Collection(s)

Show simple item record