Author:
Burkitt L. L.,Moody P. W.,Gourley C. J. P.,Hannah M. C.
Abstract
Soil phosphorus (P) buffering capacity (PBC) is an important soil property
that influences the amount of P fertiliser available for plant uptake.
However, current methods of determining PBC are time-consuming and uneconomic
in most commercial soil testing programs. The current study examined simpler
methods of measuring the PBC of a wide range of Australian soils. Phosphorus
sorption and extractable P data from 290 soils (initial data set) were
collated to define the range of PBC values of Australian agricultural soils.
Independently, detailed chemical and physical analyses were undertaken on a
second set of 90 agricultural soils (principal data set), which were selected
to represent the range of soil properties measured on the initial data set.
Relationships between PBCO&S (Ozanne and Shaw 1968)
values (P sorbed between solution P concentrations of 0.25 and 0.35 mg
P/L) and 11 different single-point P sorption indices and selected soil
properties were examined for the principal data set. Whilst relationships
between PBCO&S values and selected soil properties
such as oxalate-extractable iron and aluminium, and clay content, were
generally poor, strong relationships existed between all of the single-point P
sorption indices and PBCO&S. Results suggest that
PBCO&S values were most closely related to the P
buffering indices (PBI+ColP and
PBI+OlsP) when a single addition of 1000 mg
P/kg was added to soil and either the Colwell or 4.59 Olsen extractable P
were added to the amount of P sorbed:
PBI+ColP =
(Ps + Colwell
P)/c0.41
PBI+OlsP =
(Ps + 4.59 Olsen
P)/c0.41
where Ps is the amount of P sorbed
(mg P/kg) from a single addition of 1000 mg P/kg, and
c is the resulting solution P concentration (mg
P/L).
This index provides a simple and accurate method for estimating PBC, a
fundamental soil property that influences the P fertiliser requirements of
different soil types.
phosphorus sorption capacity, single-point phosphorus sorption index,
phosphorus retention index, soil properties, Colwell phosphorus, Olsen
phosphorus.
Subject
Earth-Surface Processes,Soil Science,Environmental Science (miscellaneous)
Cited by
140 articles.
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