Fig 2. Assimilation rate (a, A_n) and stomatal conductance (b, g_s) of olive trees in response to four phosphorus (P) levels (0.1, 1, 10 and 26 mg l^-1 P in irrigation for P1–P4 respectively).

Measurements were taken between 10:00–12:00 over three days in early May 2012. On each day, four trees per treatment were measured (n = 16). Different letters indicate significant differences at p<0.05.