Question

Effect of water logging on nitogen fixation in pulses

Answer 1

The effect of timing of waterlogging on chickpeas was examined in two pot trials. Plants were waterlogged for ten days from 21 days after sowing (DAS), at flowering or at mid-pod fill, plus combinations of these times. Waterlogging at any stage reduced seed yield; waterlogging at 21 DAS had the least effect, reducing yield relative to the non-waterlogged control by 35%. Ability of the plant to survive and regrow following waterlogging decreased with increasing physiological age: mortality rate averaged 0, 30 and 100% after waterlogging at 21 DAS, flowering and pod fill, respectively. Tolerance to waterlogging was not enhanced by previous exposure to waterlogging. In the second experiment, waterlogging was imposed at six different times shortly before or after flowering began. Ability to survive waterlogging declined sharply as flowering commenced: mortality rate increased from 13% when waterlogging was imposed six days before flowering to 65% one day after flowering, and 100% when waterlogging began 7.5 days after flowering. We suggest that survival and recovery after waterlogging may have been inhibited in flowering plants by an inadequate supply of nitrogen