Fig. 3.

Effects of mineral nitrogen (N) supply (0 or 11 mm NO₃⁻) and drained or waterlogged conditions on Melilotus siculus inoculated with rhizobia. (A) Number of nodules per plant, (B) number of nodules on main root system, (C) number of nodules on adventitious roots, (D) nodules formed during treatments, (E) individual nodule dry mass (DM) and (F) nodule/root DM ratio. Treatments were imposed 23 d after seed imbibition, for 21 d (plants were 44 d old when harvested) (20/15 °C day/night). Plants were grown in vermiculite and provided with a nutrient solution. Values are means ± s.e. (n = 3; one plant from an individual pot was partitioned to provide one replicate of the various tissues measured). For statistics see Table 2.