Table 5 Variance analysis of the investigated parameters in the second growing season.

From: Potassium humate and cobalt enhance peanut tolerance to water stress through regulation of proline, antioxidants, and maintenance of nutrient homeostasis

Source of variation

df

CHL

RWC

PROL

SOD

POD

CAT

APX

Irrigation schemes (ST)

3

*

*

*

*

*

*

*

Examined treatments (ET)

5

*

*

*

*

*

*

*

ST × ET

15

*

*

*

*

*

*

NS

 

p-value

  

 < 0.001

 < 0.001

 < 0.001

 < 0.001

 < 0.001

 < 0.001

 < 0.001

 < 0.001

 < 0.001

 < 0.001

 < 0.001

 < 0.001

 < 0.001

 < 0.001

0.001

 < 0.001

 < 0.001

 < 0.001

 < 0.001

 < 0.001

0.070

  

H2O2

PHE

N

P

Ca

KL

KR

Irrigation schemes (ST)

3

*

*

*

*

*

*

*

Examined treatments (ET)

5

*

*

*

*

*

*

*

ST × ET

15

*

*

*

*

*

*

*

 

p-value

  

 < 0.001

 < 0.001

 < 0.001

 < 0.001

 < 0.001

 < 0.001

 < 0.001

 < 0.001

 < 0.001

 < 0.001

 < 0.001

 < 0.001

 < 0.001

 < 0.001

 < 0.001

 < 0.001

 < 0.001

 < 0.001

 < 0.001

0.006

 < 0.001

  

KS

Y

WP

Fe

Mn

Zn

COL

Irrigation schemes (ST)

3

*

*

*

*

*

*

*

Examined treatments (ET)

5

*

*

*

*

*

*

*

ST × ET

15

NS

*

*

*

*

*

*

 

p-value

  

 < 0.001

 < 0.001

 < 0.001

 < 0.001

 < 0.001

 < 0.001

0.001

 < 0.001

 < 0.001

 < 0.001

 < 0.001

 < 0.001

 < 0.001

 < 0.001

0.080

 < 0.001

 < 0.001

0.002

 < 0.001

 < 0.001

 < 0.001

  

COR

CAR

RL

pH

OIL

PROT

 

Irrigation schemes (ST)

3

*

*

*

*

*

*

 

Examined treatments (ET)

5

*

*

*

*

*

*

ST × ET

15

*

NS

*

*

*

NS

 

p-value

  

 < 0.001

0.010

0.001

0.001

 < 0.001

 < 0.001

 

 < 0.001

0.009

 < 0.001

0.001

 < 0.001

 < 0.001

 < 0.001

0.513

0.001

0.023

0.003

0.378

  1. CHL total chlorophyll; RWC relative water content; PROL proline; SOD superoxide dismutase; POD peroxidase; CAT catalase; APX ascorbate peroxidase; H2O2 hydrogen peroxide; PHE phenolics; N nitrogen; P phosphorus; Ca calcium; KL potassium contents in leaves; KR potassium contents in roots; KS potassium contents in seeds; Y peanuts yield; WP water productivity; Fe iron; Mn manganese; Zn zinc; COL cobalt in leaves; COR cobalt in roots; CAR carbohydrates; RL root length; pH power of hydrogen; PROT protein ; NS non-significance.
  2. *significance at P ≤ 0.05.
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