Table 3 Effect of soil application of humic acid and bio-humic on yield, fruit weight, and volume, as well as fruit specific gravity of Kalamata olive trees

T1 = Control

43.33 d

48.31 d

5.15 d

5.44 d

5.28 d

5.71 d

0.975 b

0.953 b

T2 = Organic matter

70.67 c

60.27 c

5.66 c

6.16 c

5.63 c

6.08 c

1.005 a

1.014 a

T3 = Organic matter + humic acid

81.00 b

75.43 b

6.22 b

7.23 b

6.17 b

7.03 b

1.008 a

1.029 a

T4 = Organic matter + bio-humic

89.67 a

83.65 a

6.52 a

7.74 a

6.46 a

7.50 a

1.010 a

1.032 a