Fig. 7From: Implication of quantifying nitrate utilization and CO2 assimilation of Brassica napus plantlets in vitro under variable ammonium/nitrate ratiosThe utilization coefficients of nitrate (a) and ammonium (b) in the Brassica napus plantlets cultured under nitrate treatment. Note: Each nitrate treatment contained 20Â mM ammonium. The error bars were calculated by the error propagation formulaBack to article page