Predicting the changes in environmentally and agronomically significant phosphorus forms following the cessation of phosphorus fertilizer applications to grassland
dc.contributor.author | Dodd, Rosalind | |
dc.contributor.author | McDowell, Richard | |
dc.contributor.author | Condron, LM | |
dc.date.accessioned | 2018-05-01T01:22:10Z | |
dc.date.available | 2012-03-08 | |
dc.date.issued | 2012-06 | |
dc.description.abstract | Phosphorus (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. | |
dc.format.extent | pp.135-147 | |
dc.identifier | https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=elements_prod&SrcAuth=WosAPI&KeyUT=WOS:000305399300001&DestLinkType=FullRecord&DestApp=WOS_CPL | |
dc.identifier.doi | 10.1111/j.1475-2743.2012.00390.x | |
dc.identifier.eissn | 1475-2743 | |
dc.identifier.issn | 0266-0032 | |
dc.identifier.other | 960PB (isidoc) | |
dc.identifier.uri | https://hdl.handle.net/10182/9299 | |
dc.language | en | |
dc.language.iso | en | |
dc.publisher | Wiley on behalf of the British Society of Soil Science | |
dc.relation | The 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.x - http://dx.doi.org/10.1111/j.1475-2743.2012.00390.x | |
dc.relation.isPartOf | Soil Use and Management | |
dc.relation.uri | https://doi.org/10.1111/j.1475-2743.2012.00390.x | |
dc.rights | © 2012 The Authors. Journal compilation © 2012 British Society of Soil Science. | |
dc.subject | productivity | |
dc.subject | soil test phosphorus | |
dc.subject | superphosphate | |
dc.subject | water quality | |
dc.subject.anzsrc | ANZSRC::0503 Soil Sciences | |
dc.subject.anzsrc | ANZSRC::05 Environmental Sciences | |
dc.subject.anzsrc | ANZSRC::0703 Crop and Pasture Production | |
dc.subject.anzsrc2020 | ANZSRC::3004 Crop and pasture production | |
dc.subject.anzsrc2020 | ANZSRC::4106 Soil sciences | |
dc.title | Predicting the changes in environmentally and agronomically significant phosphorus forms following the cessation of phosphorus fertilizer applications to grassland | |
dc.type | Journal Article | |
lu.contributor.unit | LU | |
lu.contributor.unit | LU|Agriculture and Life Sciences | |
lu.contributor.unit | LU|Agriculture and Life Sciences|SOILS | |
lu.contributor.unit | LU|Research Management Office | |
lu.contributor.unit | LU|Research Management Office|OLD QE18 | |
lu.identifier.orcid | 0000-0001-8970-2460 | |
lu.identifier.orcid | 0000-0003-3911-4825 | |
pubs.issue | 2 | |
pubs.notes | Date of acceptance: January 2012 | |
pubs.publication-status | Published | |
pubs.publisher-url | http://dx.doi.org/10.1111/j.1475-2743.2012.00390.x | |
pubs.volume | 28 |