Aluminium in the soil - Soil Essentials: Managing Your Farm's Primary Asset - page 60

Summary
Aluminium toxicity in soil is directly linked to soil acidity, and fixing acidity
problems will remove the aluminium toxicity. This is strongly linked to the type of
farm enterprise and its management.
As a general principle, it is much better in the long term to control soil acidity,
than take the option of planting acid-tolerant crops (Figure 21 on p. 109). The use
of acid-tolerant crops alone as a management option will allow the soil acidity to
continue to increase further over time, eventually leading to an irreversible loss of
fertility and a breakdown of soil structure.
Regular liming will increase, or at least maintain, the range of crops that can
be grown, thus increasing the farm's profitability and sustainability.