Compost and Crude Humic Substances Produced from Selected Wastes and Their Effects on Zea mays L. Nutrient Uptake and Growth

Table 4

Cation content (mg kg⁻¹) in different composts at initial and final stages of composting.

Cation content (mg kg^−1)

Rice straw

Percentage difference

Rice husk

Percentage difference

Sawdust

Percentage difference

EFB

Percentage difference

Initial

End

Initial

End

Initial

End

Initial

End

K

15121

24200^a (±201.33)

+60.04

5976

7497^c (±20.1)

+25.45

4904

5420^d (±77.27)

+10.52

16797

23242^b (±191.51)

+38.37

Ca

11182

12013^a (±409.69)

+7.43

8181

9996^a (±520.84)

+22.19

8536

11236^a (±1307.32)

+31.63

7866

12315^a (±134.00)

+56.56

Mg

2566

7511^a (±199.77)

+192.71

2881

6713^a (±80.40)

+133.01

1755

5554^a (±941.51)

+216.47

3049

7343^a (±409.36)

+140.83

Na

1641

2439^ab (±69.95)

+48.63

1521

1950^ab (±221.40)

+28.21

1742

1896^b (±100.05)

+8.84

1956

2533^a (±46.42)

+29.50

Cu

63

71^c (±8.61)

+12.70

72

105^b (±3.23)

+45.83

118

120^b (±1.29)

+1.67

134

159^a (±1.30)

+18.66

Zn

140

164^b (±8.16)

+17.14

108

147^b (±7.85)

+36.11

126

136^b (±5.60)

+7.94

161

198^a (±2.89)

+22.98

Mn

137

223^b (±2.57)

+62.77

187

295^a (±14.63)

+57.75

20

90^d (±18.52)

+350

46

151^c (±4.32)

+228.26

Fe

1833

2541^a (±445.20)

+38.63

646

815^b (±98.90)

+26.16

509

593^b (±87.01)

+16.50

927

1418^b (±133.62)

+52.97

Different alphabets within a row indicate significant difference between means of compost at the end of composting using Tukey’s test at 𝑃≤0.05.
Positive and negative symbol at the beginning of the number is represents the decrease and increase in each items.
( ) values in parenthesis represent standard error of the mean.