Plant mechanisms to optimise access to soil phosphorus
Alan E. Richardson A C , Peter J. Hocking A , Richard J. Simpson A and Timothy S. George BA CSIRO Plant Industry, PO Box 1600, Canberra, ACT 2601, Australia.
B Scottish Crop Research Institute, Invergowrie, Dundee DD2 5DA, United Kingdom.
C Corresponding author. Email: alan.richardson@csiro.au
Crop and Pasture Science 60(2) 124-143 https://doi.org/10.1071/CP07125
Submitted: 4 May 2007 Accepted: 16 October 2007 Published: 27 February 2009
Abstract
Phosphorus (P) is an important nutrient required for plant growth and its management in soil is critical to ensure sustainable and profitable agriculture that has minimal impact on the environment. Although soils may contain a large amount of total P, only a small proportion is immediately available to plants. Australian soils often have low availability of P for plant growth and P-based fertilisers are, therefore, commonly used to correct P deficiency and to maintain productivity. For many soils, the sustained use of P fertiliser has resulted in an accumulation of total P, a proportion of which is in forms that are poorly available to most plants. The efficiency with which different P fertilisers are used in agricultural systems depends on their capacity to supply P in a soluble form that is available for plant uptake (i.e. as orthophosphate anions). In addition to fertiliser source, the availability of P in soil is influenced to a large extent by physico-chemical and biological properties of the soil. Plant access to soil P is further affected by root characteristics (e.g. rate of growth, specific root length, and density and length of root hairs) and biochemical processes that occur at the soil–root interface. The ability of roots to effectively explore soil, the release of exudates (e.g. organic anions and phosphatases) from roots that influence soil P availability, and the association of roots with soil microorganisms such as mycorrhizal fungi are particularly important. These processes occur as a natural response of plants to P deficiency and, through better understanding, may provide opportunities for improving plant access to soil and fertiliser P in conventional and organic agricultural systems.
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