The Effects of Organic Wastes on Soil and Cotton Quality with respect to the Risk of Boron and Heavy Metal Pollution
Table 3
Chemical properties of the treated soils (0–20 cm) at harvest in the two experiments.
Year
Treatments
pH
%
Available
Total (mg kg−1)
Total soluble salt
CaCO3
Organic matter
B (mg kg−1)
Pb
Ni
Cr
Co
Cd
2003
Control
7.1
<0.03
0.57
1.77
0.25
9.7
35
33
13
0.37
Mineral fertilizer
6.8
<0.03
0.47
1.30
0.22
7.3
27
29
11
0.30
Oily cumin wastes
7.2
<0.03
0.50
1.83
0.27
6.7
27
35
11
0.33
Oily oregano wastes
7.3
<0.03
0.50
1.57
0.27
5.3
36
35
13
0.43
Oilless oregano wastes
7.3
<0.03
0.57
2.20
0.31
4.3
34
32
13
0.30
Minimum
6.8
<0.03
0.47
1.30
0.22
4.3
27
29
11
0.30
Maximum
7.3
<0.03
0.57
2.20
0.31
9.7
35
35
13
0.43
LSD
n.s.
n.s.
n.s.
n.s.
n.s.
3.37
n.s.
n.s.
n.s.
n.s.
2006
Control
7.2
<0.03
1.0
0.50
0.19
3.8
31
28
12
Trace
Mineral fertilizer
6.8
<0.03
1.0
0.60
0.37
3.7
30
28
10
Trace
Oily cumin wastes
7.3
<0.03
1.2
1.10
0.56
3.5
29
27
9
Trace
Oily oregano wastes
7.2
<0.03
0.9
1.40
0.19
4.2
31
28
9
Minimum
6.8
<0.03
0.9
0.50
0.19
3.5
29
27
9
Maximum
7.3
<0.03
1.2
1.40
0.56
4.2
31
28
12
LSD
0.23
n.s.
n.s.
0.61
n.s.
n.s.
n.s.
n.s.
n.s.
n.s.
Values are an average of three replicates; n.s.: nonsignificant; LSD: least significant difference method. Means for treatments followed by the same letter are not significantly different, , .
