Waterlogging effects on wheat yield, redox potantial, manganese and iron in different soils of India

摘要

The effect of waterlogging tolerance in wheat genotypes and soil environments in micro plot (Lysimeter) experiment was investigated at the Central Soil Salinity Research Institute (CSSRI), Karnal, India. Redox potentials decreased sharply after waterlogging and were 343, 294,156, and 119 mV at 15 days after waterlogging in alkali soil at pH 7.5 (neutral soil), pH 8.2 (saline soil), pH 9.0 (sodic soil) and pH 9.4 (sodic soil), respectively. Waterlogging caused a 4 and 9 fold increase in neutral soil (pH 7.5), 4 and 24 fold increase in saline soil (pH 8.2) and 8 and 12 fold increase in sodic soil (pH 9.0 and pH 9.4) in DTPA Fe and Mn, respectively at 15 days after waterlogging in comparison with drained conditions. These increases were higher, than reported critical concentrations for wheat. After 15 days waterlogging, all soils were drained, and the re-aeration resulted in an increase in redox potential and a decrease in DTPA-Fe and DTPA-Mn in soil solutions, but this occurred slowly taking 15- 25 days. Results support the working hypothesis that waterlogging tolerance is a product of tolerance to anoxia and microelement toxicities, and that these are both key factors limiting plant growth during and after waterlogging.