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Total Kjeldhal nitrogen (TKN) (A) and protein content (B) in leaves and roots of maize plants grown for 15 days in sand with or without AA309. C = control, LD = Low AA309 dosage (=2.1 mg/kg N); HD = High AA309 dosage (=4.2 mg/kg N). Different letters above bars indicate significant differences between treatments (p < 0.05, ±SD, n = 5). Lower case letters are referred to leaf comparison, while capital letters are referred to root comparison.
