Table 3 The impacts of different concentrations and application times of fulvic acid on antioxidant capacity and SOD, CAT, APX, and POX activity of ‘Kaleh-Ghoochi’ pistachio nut

Fulvic acid application time

Fulvic acid concentration

(g L^− 1)

Antioxidant capacity

(%)

SOD activity

CAT activity

APX activity

POX activity

(U mg ^− 1 protein)

June

0

57.34 ± 4.022 bc

57.35 ± 3.67 b

5.57 ± 0.66 f

19.33 ± 2.02 cd

1.23 ± 0.03 a

1.5

75.903 ± 4.314 a

178.07 ± 19.52 a

11.34 ± 1.42 bcd

31.03 ± 4.86 ab

0.6 ± 0.01 b

3

54.546 ± 5.007 c

91.03 ± 25.18 b

7.66 ± 0.57 ef

14.58 ± 2.01 d

1.01 ± 0.05 a

4.5

76.98 ± 1.072 a

104.72 ± 44.58 b

9.34 ± 1.02 de

30.71 ± 4.14 ab

1.22 ± 0.34 a

August

0

57.34 ± 4.022 bc

57.35 ± 3.67 b

5.57 ± 0.66 f

19.33 ± 2.02 cd

1.23 ± 0.03 a

1.5

67.106 ± 5.699 abc

184.81 ± 31.97 a

12.77 ± 1.74 bc

32.91 ± 4.04 ab

0.56 ± 0.01 b

3

77.45 ± 4.302 a

96.74 ± 25.13 b

8.81 ± 0.53 de

19.6 ± 1.42 cd

1.1 ± 0.02 a

4.5

75.38 ± 7.144 a

242.64 ± 4.81 a

15.81 ± 0.25 a

38.92 ± 4.41 ab

0.47 ± 0.05 b

June-August

0

57.34 ± 4.022 bc

57.35 ± 3.67 b

5.57 ± 0.66 f

19.33 ± 2.02 cd

1.23 ± 0.03 a

1.5

76.53 ± 1.17 a

240.74 ± 1.98 a

13.38 ± 0.46 ab

40.12 ± 1.34 a

0.4 ± 0.04 b

3

71.12 ± 1.61 ab

203.7 ± 9.9 a

11.08 ± 0.23 cd

31.82 ± 5.65 ab

0.31 ± 0.008 b

4.5

69.68 ± 7.17 ab

182.74 ± 0.68 a

9.96 ± 0.96 de

28.07 ± 0.03 bc

1.06 ± 0.01 a