Field studies with radioactive sulphur-labelled gypsum fertiliser

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Abstract
The movement of fertilizer S within the profiles of soils, belonging to the recent and yellow-brown earth soil groups, was investigated by applying 35S-labeled gypsum fertilizer in the spring to several field trials located on these soils. Under similar rainfall conditions, the patterns of fertilizer S movement varied. The main soil properties and processes contributing to this variation were S retention capacity and water-holding capacity. The extent of pasture improvement, as related to soil organic matter status and bulk density, had little effect on fertilizer S movement. The significance of the observed fertilizer S movement is discussed in relation to the fertilizer S requirements of pastures.