Table 1 Physicochemical attributes of compost and soil used in the experiment

Organic matter

%

0.61

4.58

pH

-

7.4

8.22

Electrical Conductivity

dS m^− 1

1.56

2.19

Total Nitrogen

%

1.35

Available Phosphorous

mg kg^− 1

6.78

6.45

Extractable Potassium

mg kg^− 1

165.7

91.5

Cation Exchange Capacity

cmolc kg^− 1

1.44

Volumetric moisture contents

%

35.98

Nickel concentration

mg kg^− 1

Non-detectable

Non-detectable