Journal
SOIL SCIENCE SOCIETY OF AMERICA JOURNAL
Volume 78, Issue 1, Pages 139-146Publisher
WILEY
DOI: 10.2136/sssaj2013.05.0188
Keywords
-
Categories
Funding
- Cotton Catchment Communities Cooperative Research Centre (Cotton CRC) [1.03.44]
Ask authors/readers for more resources
Long-term studies suggest readily available P, measured using a bicarbonate extractant, can be replenished by slowly available inorganic P pools. The aim of this study was to estimate the supply of slowly available P to the soil solution. Readily and slowly available P pools were measured using two agronomic soil P tests (the bicarbonate (Colwell) and dilute acid (Bureau of Sugar Experiment Stations; BSES) extractants, respectively) in vertisol soils of the northern grains region (NGR) of eastern Australia. The amount of P supplied to the soil solution was estimated by the iron oxide sink method accumulated over 96 h (FeOt-P). The readily available P pool (i.e., Colwell-P) was strongly correlated with FeOt-P, and this pool was likely to be replenished by the slowly available P pool (i.e., BSES-P) when BSES-P concentrations were >61 mg P kg(-1). The slowly available P pool did not supply the readily available P pool when the Ca (mg kg(-1))/P (mg kg(-1)) ratio in the BSES extract was >74:1, suggesting the presence of Ca phosphates of low solubility affected potential buffering. Using a multiple linear regression, approximately 75% of the variability in the ability of the slowly available P pool to supply soil solution P could be explained by the quantity of BSES-P and the ratio of Ca/P in the BSES extract.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available