Table 6 The effects of treatment with humic acid or fulvic acid and different rates of the recommended dose of phosphorus fertilizer (RDP) on the uptake of N, P, and K in straw (kg/ha) of barley cultivar Giza 123 in the seasons 2018/2019 and 2019/2020

HA + 100% RDP

101.99 ± 4.84 a

103.33 ± 2.96 a

16.20 ± 0.77 a

16.42 ± 0.76 a

41.94 ± 1.99 a

42.49 ± 1.96 a

HA + 75% RDP

93.17 ± 4.42 ab

94.41 ± 1.56 b

15.17 ± 0.72 ab

15.37 ± 0.71 ab

36.97 ± 1.75 b

37.45 ± 1.73 b

HA + 50% RDP

84.36 ± 4.00 bc

85.47 ± 1.06 bc

14.12 ± 0.67 bc

14.31 ± 0.65 bc

31.99 ± 1.52 cd

32.41 ± 1.50 cd

HA + 0% RDP

66.73 ± 3.17 ef

67.61 ± 1.12 e

12.05 ± 0.57 def

12.21 ± 0.57 def

22.03 ± 1.05 g

22.32 ± 1.03 g

FA + 100% RDP

85.51 ± 4.06 bc

86.62 ± 2.27 c

13.71 ± 0.65 bcd

13.88 ± 0.64 bcd

34.30 ± 1.63 bc

34.75 ± 1.60 bc

FA + 75% RDP

78.13 ± 3.71 cd

79.16 ± 2.46 d

12.97 ± 0.62 cde

13.14 ± 0.60 cde

31.00 ± 1.47 cde

31.40 ± 1.45 cd

FA + 50% RDP

70.77 ± 3.36 de

71.69 ± 2.59 d

12.23 ± 0.58 cde

12.39 ± 0.57 de

27.70 ± 1.31 de

28.07 ± 1.29 de

FA + 0% RDP

56.02 ± 2.66 gh

56.75 ± 1.80 f

10.77 ± 0.51 fg

10.91 ± 0.50 fg

21.12 ± 1.01 g

21.39 ± 0.98 g

100% RDP

64.75 ± 3.07 efg

65.61 ± 3.03 ef

11.79 ± 0.56 efg

11.95 ± 0.55 efg

28.01 ± 1.33 ef

28.39 ± 1.31 ef

75% RDP

58.63 ± 2.78 fgh

59.40 ± 2.74 fg

10.12 ± 0.48 gh

10.26 ± 0.47 gh

24.21 ± 1.15 fg

24.54 ± 1.13 fg

50% RDP

52.50 ± 2.49 h

53.19 ± 2.46 g

8.46 ± 0.40 h

8.57 ± 0.40 h

20.42 ± 0.97 g

20.69 ± 0.96 g

0% RDP

40.26 ± 1.91 i

40.79 ± 1.88 h

5.12 ± 0.24 i

5.19 ± 0.24 i

12.81 ± 0.61 h

12.99 ± 0.60 h