Fig. (1) Nutrient concentration (%) and uptakes (kg ha^-1) of onion bulb: Nitrogen concentration (a), Potassium concentration (b), Sulfur concentration (c), Nitrogen uptake (d), Potassium uptake (e), Sulfur uptake (f). Treatments (column) not connected by same letter for nutrient concentrations and uptakes are significantly different at the 0.01 level of probability. Vertical bars represent standard error of the mean.