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More than 80% of the topsoils sampled fall below the critical surface pHCaCl2 of 5.5 in the northern and southern Wheatbelt study areas, with more in the south than the north. These results confirm soil acidity is a serious concern throughout the WA Wheatbelt when considered in conjunction with the more intensive analysis of current soil pH throughout the Avon River Basin (2005–2008).

agriculture; salinity; erosion; carbon; 

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