کاهش اثرات مخرب تنش غرقابی بر کلزا با کاربرد کودهای زیستی

In the current experiment, the application of biofertilizers in order to alleviate the damages of the two weeks waterlogging stress in the 5-leaf growth stage of canola (Brassica napus L.) was evaluated. The biofertilizers include AAP (a combination of Azotobacter chroococcum, Azospirillum brasilense, A. lipoferum, Pseudomonas fluorescens and P. putida) and APB (a combination of Azospirillum brasilense, A. lipoferum, Pseudomonas fluorescens and Basillus subitilis) which applied by seed inoculation or foliar spray at different times. The results of this study showed that the waterlogging stress significantly decreased the nitrogen, chlorophyll a, chlorophyll b and carotenoid concentrations in the leaves and also decreased the grain yield, whereas the ethylene production in the leaves was increased by this stress. The undesirable effects of the waterlogging stress were alleviated by the seed inoculation or foliar application of biofertilizers. Overall, it was concluded that, among the application methods, the seed inoculation of biofertilizers is more cost efficient and advisable to alleviate the waterlogging damage in canola.