Abstract
We evaluated waterlogging tolerance in barley, Italian ryegrass, and oat at three different growth stages. First, we
evaluated crop emergence rate under three conditions: waterlogging at ground level, waterlogging at 5 cm below ground
level, and no waterlogging (control). The emergence rate was the highest in Italian ryegrass, followed by oat and barley.
Next, we evaluated crop responses to waterlogging at the early and late growth stages. In addition, we evaluated recovery
growth after waterlogging. Waterlogging at the early growth stage did not reduce plant dry weight in all crops, whereas
waterlogging at the late growth stage significantly reduced root dry weight at the end of treatment in all crops (P<0.01).
In Italian ryegrass and oat, subsequent growth after waterlogging at the late growth stage showed no significant difference
between plants subjected to waterlogging and those in the control. The shoot dry weight at the harvest stage in barley was
significantly lower under waterlogging at the late growth stage compared with that in the control (P<0.01). Our results
showed that Italian ryegrass exhibited the highest waterlogging tolerance except for waterlogging at the late growth stage,
followed by oat and barley.
