Author:
Nash David M.,Halliwell David J.
Abstract
This paper reviews phosphorus loss from productive high rainfall grazing
systems. In particular it describes the processes occurring when phosphatic
fertilisers are added to soil, the different pathways through which fertiliser
and other nutrient sources may contribute to phosphorus losses, and an
evaluation of the management strategies aimed at minimising phosphorus loss.
It is now generally accepted that soil is not an endless sink for phosphorus
uptake and that at the landscape scale the highest concentrations of
phosphorus loss occur in surface runoff, followed by macropore flow and
vertical matrix flow. However, loads of phosphorus lost through these pathways
are unknown. The development of an understanding of the transport mechanisms
and phosphorus species being transported is fundamental to developing
management strategies that are effective in decreasing phosphorus losses from
grazing systems.
Subject
Earth-Surface Processes,Soil Science,Environmental Science (miscellaneous)
Cited by
88 articles.
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