Different amount of elements detecting in wheat under B stress at (a) T0=0 mg/kg H3BO3; (b) T1=3 mg/kg H3BO3; (c) T2=6 mg/kg H3BO3; (d) T3=9 mg/kg H3BO3; (e) T4=12 mg/kg H3BO3; (f) T5=15 mg/kg H3BO3; (g) T6=18 mg/kg H3BO3.