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 Efficiency
of Soil and Fertilizer Phosphorus Use
Reconciling changing concepts of soil phosphorus behaviour with agronomic
information
Published by FAO. 2008
ISBN 978-92-5-105929-6
J.K. Syers, Dean, School of ScienceMae Fah Luang University, Thailand
A.E. Johnston, Lawes Trust Senior Fellow Rothamsted Research, United
Kingdom
D. Curtin, Scientist New Zealand Institute for Crop & Food Research
Limited, New Zealand
The efficient use of phosphorus (P) is essential to many
agricultural and environmental issues. These include maintaining or improving
the P fertility of soils by the judicious use of P fertilizers and other sources
of P, such as organic manures including animal manures, composts and biosolids.
There is also the need to conserve the finite global P resource. This bulletin
reviews, analyses and synthesizes information on the efficient use of soil and
fertilizer P. It presents information on the plant availability of soil and
fertilizer P, with an emphasis on soil plant interactions. The focus is on the
changing concepts of the behaviour of both soil and fertilizer P and on the need
to define and assess their recovery and, thus, P-use efficiency more
appropriately. The bulletin also outlines strategies for improving P-use
efficiency. Strategies for improving the efficiency of use of soil and
fertilizer P include: (i) modifying surface soil properties; (ii) managing
surface soil; (iii) managing P sources; and (iv) optimizing P use through
economically appropriate rates and timing. The main conclusion of this bulletin
is that the efficiency of fertilizer P use is often high when evaluated over an
adequate time scale using the balance method.
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