estimated 29million ha of australian soil is affected with this problem.
when it gets bad, the subsoil becomes acidic, and it becomes impractical to try fix the problem.
see ideally the soil should be pH between 6.5 and 7.5. once it gets like 4.5 - 5.3, things get a bit dodgy.
in acidic soil, nutrients such as phosphorus and magnesium are less available, and other nutrients such as aluminium and manganese become toxic.
also, in acidic soils, nodulation and nitrogen fixation is less because bactera cant survive as well in acidic environments.
lime is sitll the best way to fix acidity problems
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