Figure 3.

Effect of foliar boron application (1.1 kg ha⁻¹) on nitrogenase activity (nitrogen fixation rate) in watered plants (A) and water stressed plants (B), natural abundance δ¹⁵N in seed of watered plants (C) and water stressed plants (D), and natural abundance δ¹³C in seed of watered plants (E) and water stressed plants (F). Treatments were watered plants without foliar B (W–B), and watered plants with foliar B (W+B), water stressed plants with no foliar B (WS–B); water stressed plants with foliar B (WS+B).