
%0 Journal Article
%A Blair, G. J. 
%A Anderson, G. 
%A Crestani, M. 
%A Lewis, D. 
%T Soil sulfur status, sulfur fertiliser responses and rainfall sulfur accessions at trial sites in the National Reactive Phosphate Rock Project
%J Australian Journal of Experimental Agriculture
%D 1998/02/27
%V 37
%N 8
%P 995-1001
%K 
%R https://doi.org/10.1071/EA96114
%U https://www.publish.csiro.au/paper/EA96114 
%X Summary. The sulfur (S) status of the National Reactive Phosphate Rock Project trial sites was determined using 2 chemical extractants KCl-40 (0.25 mol KCl/L heated to 40&#xb0;C) and MCP (0.01 mol mono-calcium phosphate/L). There were marked differences between sites in KCl-40- extractable S down the soil profile. Soil profiles were classified into 4 groups according to the shape of the extractable S profile. KCl-40 was better able to distinguish between responsive (significant at P = 0.10 only) and unresponsive sites than MCP. Mean S accession in rainfall over the 3 years ranged from 0.40 kg/ha . year at Jericho (site T17) in the centre of Tasmania to 20.33 kg/ha . year at Smithton (site T16) on the north-west coast of Tasmania. The proportion of S-responsive sites increased from 26% in the first year to 43, 42 and 48% in years 2, 3 and 4 respectively. Such a large proportion of S-responsive sites limits the use of direct application of reactive phosphate rock fertiliser. 
