Journal of Food, Agriculture and Environment

Vol 10, Issue 1,2012
Online ISSN: 1459-0263
Print ISSN: 1459-0255

Effect of ammonium/nitrate nitrogen ratio on photosynthesis, respiration and some vegetative traits of canola grown under salinity stress


Ahmad Bybordi

Recieved Date: 2011-09-12, Accepted Date: 2012-01-14


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.


Canola, salinity, ammonium and nitrate ratios, photosynthesis, respiration

Journal: Journal of Food, Agriculture and Environment
Year: 2012
Volume: 10
Issue: 1
Category: Agriculture
Pages: 372-375

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