Table 4 The effects of treatment with humic acid or fulvic acid and different rates of the recommended dose of phosphorus fertilizer (RDP) on number of grain per spikes and 1000-grain weight of barley cultivar Giza 123 in the seasons 2018/2019 and 2019/2020

HA + 100% RDP

57.10 ± 2.71 a

57.88 ± 2.63 a

58.40 ± 1.30 a

59.17 ± 1.04 a

HA + 75% RDP

55.23 ± 2.62 ab

56.00 ± 2.55 ab

56.93 ± 1.53 ab

57.68 ± 0.97 ab

HA + 50% RDP

53.38 ± 2.53 ab

54.11 ± 2.46 abc

55.46 ± 1.18 abc

56.19 ± 3.07 a

HA + 0% RDP

49.65 ± 2.36 abcd

50.34 ± 2.29 abcde

52.52 ± 2.41 ab

53.21 ± 1.08 cde

FA + 100% RDP

54.34 ± 2.58 ab

55.09 ± 2.50 abc

54.17 ± 2.57 bc

54.88 ± 1.58 bc

FA + 75% RDP

51.65 ± 2.45 abc

52.36 ± 2.38 abcd

53.39 ± 1.06 bc

53.66 ± 1.07 cd

FA + 50% RDP

48.96 ± 2.32 abcd

49.64 ± 2.26 bcdef

51.75 ± 1.73 cd

52.43 ± 1.09 cdef

FA + 0% RDP

43.58 ± 2.07 de

44.18 ± 2.01 fg

49.32 ± 1.52 d

49.97 ± 0.92 fg

100% RDP

49.38 ± 2.35 bcd

50.06 ± 2.27 cdef

53.05 ± 2.20 abc

53.75 ± 1.07 cd

75% RDP

46.82 ± 2.22 cde

47.47 ± 2.16 defg

51.55 ± 1.72 bc

52.22 ± 2.38 def

50% RDP

44.27 ± 2.10 de

44.88 ± 2.04 efg

50.04 ± 0.70 cd

50.70 ± 0.94 efg

0% RDP

39.17 ± 1.86 e

39.71 ± 1.80 g

47.04 ± 1.58 d

47.65 ± 1.18 g