Table III.

Total sulfur and nitrogen content of B. oleracea as affected by pedospheric and atmospheric sulfur nutrition

	Total S	Total N	N:S Ratio (on a molar basis)
	mmol g−1 DW
Shoot
Initial	0.426 ± 0.021	4.29 ± 0.16	10.1
−S	0.059 ± 0.010*	3.87 ± 0.25	65.6*
−S, H2S	0.063 ± 0.002*	4.12 ± 0.12	65.4*
+S	0.481 ± 0.005	4.16 ± 0.04	8.6
+S, H2S	0.503 ± 0.025	4.06 ± 0.08	8.1
Roots
Initial	0.385 ± 0.014	3.94 ± 0.03*	10.2
−S	0.093 ± 0.029*	3.53 ± 0.09	38.0*
−S, H2S	0.097 ± 0.023*	3.68 ± 0.06	37.9*
+S	0.394 ± 0.018	3.61 ± 0.10	9.2
+S, H2S	0.352 ± 0.026	3.66 ± 0.02	10.4

B. oleracea was grown on a 25% Hoagland nutrient solution at 0.5 mm sulfate in a climate controlled room for 7 d and subsequently transferred to a fresh nutrient solution at 0 mm sulfate (−S) or 0.5 mm sulfate (+S) and simultaneously exposed to 0 or 75 nL L⁻¹ H₂S for 10 d. Total S and N are expressed as mmol g⁻¹ DW and represent the mean of 3 measurements with 27 (initial) and 3 plants in each (± sd). Values marked with an asterisk are significantly different from the control value (+S; P < 0.01).