Typical cells different soils

Worldwide, given adequate nutrients, the presence of AP+ is the main limiting factor in plant productivity in acidic soils. Plants such as tea that accumulate AP+ are rare and do so in acidic soils and evidently detoxify the AP+ by storing a chelated version in cell vacuoles of older leaves separate from the more metabolically active parts of the plant. Tea plants have been found with as much as 3% AP+ in older leaves and only 0.01% in younger ones, a 300-fold difference. Typical tea infusions contain about 50 times as much AP+ as do infusions from coffee. Adding milk to tea should immobilize Al + as an insoluble phosphate, while lemon will strongly complex the Al + in deleterious soluble citrate complexes described below. 

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