Determining the longer term decline in plant-available soil phosphorus from short-term measured values

A - Papers appearing in refereed journals

Johnston, A. E., Poulton, P. R., White, Robin P. and Macdonald, A. J. 2016. Determining the longer term decline in plant-available soil phosphorus from short-term measured values. Soil Use and Management. 32 (2), pp. 151-161.

AuthorsJohnston, A. E., Poulton, P. R., White, Robin P. and Macdonald, A. J.
Abstract

Once phosphorus (P) applications stop, it is important to know how long it will take for plant-available P in soil to decline to a particular level for soils with a history of intensive management. The rate of decline in the absence of applied P can be expressed as a half-life, that is the time in years for it to halve relative to the lowest level measured in the soil. This knowledge is essential when planning long-term policies for managing the P status of soils. It is important to farmers who wish to optimize applications of P fertilizers and make better use of accumulated P residues to ensure that plant-available P does not fall below the critical level for the soil and crop because of the risk of losing yield and the inefficient use of other inputs, especially N fertilizer. Lower levels of plant-available P are also desirable for environmental and ecological reasons. Allowing plant-available P to decline to the critical level from unnecessarily high concentrations will reduce the risk from P on eroded soil causing adverse effects of eutrophication in surface water. Low levels of plant-available P are usually considered necessary for establishing species-rich grassland. A method for determining the longer term decline in plant-available soil P from short-term measured values is presented.

KeywordsSoil Science
Year of Publication2016
JournalSoil Use and Management
Journal citation32 (2), pp. 151-161
Digital Object Identifier (DOI)doi:10.1111/sum.12253
Open accessPublished as non-open access
FunderBiotechnology and Biological Sciences Research Council
Funder project or codeDelivering Sustainable Systems (SS) [ISPG]
ISSN02660032
PublisherWiley

Permalink - https://repository.rothamsted.ac.uk/item/8v1q6/determining-the-longer-term-decline-in-plant-available-soil-phosphorus-from-short-term-measured-values

Restricted files

Publisher's version

Under embargo indefinitely

6 total views
3 total downloads
1 views this month
0 downloads this month