Soil acidification is a natural process that is accelerated by agricultural production [1,2]. It has been estimated that 80-90 million hectares of land in the agricultural areas of Australia are acidic, with 30-35 million requiring immediate remedial action [pH (CaCl2) 4.8] [3,4]. In Western Australia alone, two thirds of the soils in the agricultural areas of state are acidic or at risk from soil acidification [pH (CaCl2) 5].