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The density and size of drops on the leaves of Rhinanthus alectorolophus (55 d after sowing) classified on an ordinal scale: (A) no drops (0), (B) small drops (0·5), (C) large drops (1). The plant was cultivated under (A) low irrigation and nutrient treatment, (B) low irrigation and high nutrient treatment, and (C) high irrigation and nutrient treatment. Images were taken immediately before the physiological measurement.
