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Linear regression between photosynthetic rate (PN) and intercellular CO2 concentration [CO2]i drawn to calculate carboxylation efficiency (CE) of mustard (Brassica juncea L.) plants sprayed with 0, 100 or 200 μl l−1 ethephon at 40 DAS and grown with soil-applied 0, 40, and 80 mg N kg−1 soil at 50 DAS (** significant at P <0.01).
