Measurement of the in-package atmosphere revealed that CO, concentrations in the perforated
bags were maintained around 0.12- 0.16% and
did not rise to more than 0.2% (Fig. 1) The CO,
concentrations in the sealed bags, however, accumulated gradually during the first 7 days to 3.0%
and then leveled off thereafter. The 0, levels in
the perforated bags remained at around 19-20%
throughout the experiment (Fig. 1). Slightly lower
levels of 0, (16- 17%) were detected in the sealed
bags.