Table 3.

The solitary effects of adopting water stress and applying different applications methods of potassium humate and zinc applications under partial root-zone drip irrigation techniques on maize nutrient uptake during the growing seasons of 2019/2020 and 2020/2021

Studied factors		N (g kg−1)	P (g kg−1)	K (g kg−1)	Mg (g kg−1)	Fe (mg kg−1)	Zn (mg kg−1)
PRIs techniques
FDI		12.03 ± 4.2 b	1.31 ± 0.39 a	5.16 ± 1.4 a	0.949 ± 0.16 b	128.1 ± 21 b	35.3 ± 17.8 b
ADI		12.73 ± 3.9 a	1.22 ± 0.36 b	5.04 ± 1.5 b	1.07 ± 0.16 a	146.2 ± 20.6 a	43.5 ± 19.3 a
Irrigation levels (Ir)
100 (%)		13.58 ± 2.8 a	1.28 ± 0.42 a	4.90 ± 1.2 b	1.011 ± 0.14 a	138.1 ± 21.7 a	39.2 ± 19.5 b
75 (%)		11.08 ± 3.6 b	1.26 ± 0.34 b	5.30 ± 1.5 a	1.012 ± 0.25 a	136.2 ± 33.4 b	39.6 ± 19.2 a
Applications (EAP)
Control		9.85 ± 2.9 f	0.98 ± 0.13 e	4.15 ± 0.71 g	0.919 ± 0.17 h	118.4 ± 21.4 i	27.8 ± 7.8 i
KH F		12.24 ± 2.4 c	1.23 ± 0.24 c	4.65 ± 0.42 e	0.960 ± 0.17 f	126.1 ± 21.3 h	29.5 ± 7.9 h
Zn F		11.34 ± 1.6 e	1.16 ± 0.20 d	4.60 ± 0.34 f	0.943 ± 0.16 g	132.7 ± 21.6 g	33.4 ± 9.5 f
KH S		12.55 ± 2.5 bc	1.18 ± 0.19 d	5.18 ± 1.2 d	0.989 ± 0.18 e	138.1 ± 21.4 e	32.6 ± 4.9 g
Zn S		11.71 ± 2.6 d	1.13 ± 0.17 d	4.70 ± 0.74 e	0.983 ± 0.16 e	136.2 ± 21.5 f	42.2 ± 9.0 d
KH F + Zn F		11.59 ± 5.5 de	1.49 ± 0.4 a	5.61 ± 1.0 b	1.02 ± 0.14 d	142.3 ± 21.5 d	40.2 ± 7.5 e
KH F + Zn S		12.72 ± 4.3 b	1.38 ± 0.19 b	5.50 ± 0.77 c	1.06 ± 0.15 c	144.2 ± 21.6 c	48.9 ± 3.2 b
KH S + Zn F		14.69 ± 2.5 a	1.35 ± 0.21 b	5.58 ± 1.3 b	1.096 ± 0.14 b	147.7 ± 21.6 b	46.8 ± 6.9 c
KH S + Zn S		14.76 ± 1.2 a	1.47 ± 0.10 a	5.94 ± 1.1 a	1.12 ± 0.13 a	152.1 ± 21.6 a	53.6 ± 5.8 a
Source of variation	df	p-values
PRIs techniques	1	0.003	0.002	0.002	0.003	< 0.001	0.001
Irrigation levels (Ir)	1	0.001	0.009	< 0.001	0.348 NS	< 0.001	0.03
Examined applications (EAP)	8	< 0.001	< 0.001	< 0.001	< 0.001	< 0.001	< 0.001
PRIs × Ir	1	0.007	< 0.001	< 0.001	< 0.001	< 0.001	0.000
PRIs × EAP	8	< 0.001	0.004	< 0.001	0.589 NS	< 0.001	< 0.001
Ir × EAP	8	< 0.001	< 0.001	< 0.001	0.995 NS	< 0.001	< 0.001
PRIs × Ir × EAP	64	< 0.001	< 0.001	< 0.001	< 0.001	< 0.001	< 0.001

Abbreviations: N Nitrogen, P Phosphorus, K Potassium, Mg Magnesium, Fe Iron, Zn Zinc, PRIs Partial root-zone drip irrigation techniques, FDI Fixed partial root-zone drip irrigation, ADI Alternate partial root-zone drip irrigation. control (tap water applications), KH F (foliar applications of potassium humate = 3 g L⁻¹ water), Zn F (foliar applications of chelated zinc = 1.25 kg ha⁻¹), KH S (applications of potassium humate applied through the drip irrigation systems = 3 g L⁻¹), Zn S (chelated zinc applied through the drip irrigation systems at a rate of 1.25 kg ha⁻¹)