Waterlogging for short period at the vegetative
stage reduced the growth and yield of yard long bean in the
experiment in the section 1, presumably due to the restriction
of lateral shoot development, while that at the flowering
stage gave a limited influence to the growth and yield.
These facts may indicate that there is a period when the
plants are susceptible to the stress. The same treatment at
the vegetative stage, however, affect the growth and yield
to much less degree in the experiment in the section 2. It
is considered that subtle changes in environmental conditions
interact with the susceptibility of the plants.