We made a hypothesis that elevated CO2 concentrations in the
root zone associated with elevated soil water contents lead to
growth stagnation in sweet potato. In this study, we investigated
the effects of soil water contents and gas components on the growth
performance of sweet potato cultured with different irrigation frequencies,
water table levels and soil gas components to confirm the
above hypothesis and to obtain basic knowledge about the moisture
and gaseous environment in the root zone, which is suitable
for developing sweet potato production.