
TY  - JOUR
A1  - He, J. Z. 
A1  - Gilkes, R. J. 
A1  - Dimmock, G. M. 
T1  - Mineralogical properties of sandy podzols on the Swan Coastal Plain, south-west Australia, and the effects of drying on their phosphate sorption characteristics
JF  - Soil Research
JO  - Soil Res.
Y1  - 1998
VL  - 36
IS  - 3
SP  - 395
EP  - 410
KW  - phosphorus leaching, seasonal change, allophane.
UR  - https://doi.org/10.1071/S97061 
N2  - Very sandy and sometimes seasonally inundated humus podzols of the Bassendean soil association in southwest Australia experience severe leaching of fertiliser P with consequent eutrophication of waterways. P sorption by these soils is mostly minimal and is primarily due to the podzol Bh horizon. The consequence of seasonal drying of profiles under the prevailing Mediterranean climate on the P sorption capacity of these B horizon materials is not known. The effects of air-drying on P sorption were studied for 3 sandy podzols using samples from entire soil profiles collected in winter (wet) and summer (dry). Results confirm that the surface and near surface horizons (i.e. A and E horizons) of these soils have very low P sorption capacities. Only some B horizon materials exhibit substantial P sorption and this is mostly due to allophane, with minor contributions from extractable Fe forms, organic carbon, and clay. Air-drying during summer and in the laboratory increased P sorption of B horizon materials by up to 120% compared with field-moist samples. The difference in P sorption between air-dried samples and the field-moist samples decreased for long reaction times. 
ER  -

