Excess water management
Due to the uncertainty
of rainfall, excess water may accumulate in the rhizosphere. Excess water may
cause anoxia in the rhizosphere and plant roots do not get sufficient oxygen to
respire. Turbidity associated with excess water also damages the crop. In rice,
excess water accumulation at vegetative stages deters tillering. The crop
growth stage in between flowering to maturity is more sensitive to excess water
compared to the stage from maximum tillering to flowering. If fields remain flooded
beyond the dough stage, the crop will show non-homogenous maturity and
harvesting of the crop will be delayed. Management of submergence and drainage
are two important options for the management of excess water.