摘要 : Canola cultivars respond differently to nitrogen sources and to saline conditions. Interactions between salinity and NH₄⁺ and NO₃^- ratios with canola genotypes were studied. The effect o... 展开 Canola cultivars respond differently to nitrogen sources and to saline conditions. Interactions between salinity and NH₄⁺ and NO₃^- ratios with canola genotypes were studied. The effect of four NH₄⁺ and NO₃^- ratios (100:0, 75:25, 50:50 and 25:75) and three salinity levels (100, 150 and 200 mM NaCl) on three canola cultivars (SLM₀₄₆, Licord and Okapi) were studied in a greenhouse experiment. Photosynthesis, respiration, leaf number, leaf area and fresh and dry weight were assayed in current study. Results revealed that there were significant differences among canola cultivars in response to salinity stress, although salinity resulted in a smaller leaf area, lower plant fresh and dry matter and lower photosynthesis in all canola cultivars. Regarding different ratio of ammonium and nitrate, application of equal proportion of ammonium and nitrate to the nutrient solution contributed to improved growth so that it is recommended to use under salinity stress conditions. 收起