Absorption of arsenic by edible plants

[Chuck.R]

Arsenic was used for many years as an insecticide in both cotton fields and
pecan groves in the southern USA.  The primary problem that occurred in
following years was that Phosphorus uptake was inhibited at lower soil test
levels of P.  Once sufficient P was applied and soil pH was optimized the
problem disappeared. Soil pH's of 6.3+ force Arsenic and most heavy metals
out of availability.

Chuck