EFFECTS OF WATERLOGGING ON CHICKPEAS .1. INFLUENCE OF TIMING OF WATERLOGGING

The effect of timing of waterlogging on chickpeas was examined in two pot trials. Plants were waterlogged for ten days from 21 days after so wing (DAS), at flowering or at mid-pod fill, plus combinations of thes e times. Waterlogging at any stage reduced seed yield; waterlogging at 21 DAS had the least effect, reducing yield relative to the non-water logged control by 35%. Ability of the plant to survive and regrow foll owing waterlogging decreased with increasing physiological age: mortal ity rate averaged 0, 30 and 100% after waterlogging at 21 DAS, floweri ng and pod fill, respectively. Tolerance to waterlogging was not enhan ced by previous exposure to waterlogging. In the second experiment, wa terlogging was imposed at six different times shortly before or after flowering began. Ability to survive waterlogging declined sharply as f lowering commenced: mortality rate increased from 13% when waterloggin g was imposed six days before flowering to 65% one day after flowering , and 100% when waterlogging began 7.5 days after flowering. We sugges t that survival and recovery after waterlogging may have been inhibite d in flowering plants by an inadequate supply of nitrogen or carbohydr ates.