Selected Chemical Properties of Soybean Rhizosphere Soil as Influenced by Cropping Systems, Rhizobium Inoculation, and the Supply of Phosphorus and Potassium after Two Consecutive Cropping Seasons
Table 1
Effects of Rhizobium inoculation, cropping systems, and the supply of P and K on macronutrients in the rhizosphere soil measure in 2016 season.
Treatments
N
OC
Av. P
K
Ca
Mg
Na
%
Bray 1. mg/kg
Meq/100 g
Crop. system
SB
0.039 ± 0.001
2.65 ± 0.05
3.56 ± 0.56
2.20 ± 0.15
8.60 ± 0.41
1.67 ± 0.06
0.16 ± 0.01
M + B (A)
0.041 ± 0.001
2.65 ± 0.05
3.50 ± 0.59
2.25 ± 0.17
7.95 ± 0.39
1.58 ± 0.06
0.18 ± 0.01
M + B (B)
0.040 ± 0.001
2.67 ± 0.04
3.42 ± 0.66
2.27 ± 0.18
8.55 ± 0.44
1.62 ± 0.06
0.19 ± 0.01
Rhizobia
Without
0.038 ± 0.001
2.59 ± 0.04
2.18 ± 0.40
2.32 ± 0.15
7.81 ± 0.28
1.50 ± 0.04
0.15 ± 0.01
With
0.042 ± 0.001
2.72 ± 0.03
4.81 ± 0.52
2.16 ± 0.12
8.92 ± 0.37
1.75 ± 0.05
0.20 ± 0.01
Fertilizers
Control
0.038 ± 0.002
2.61 ± 0.06
0.60 ± 0.17
1.51 ± 0.23
6.92 ± 0.39
1.59 ± 0.06
0.14 ± 0.01
20 K
0.039 ± 0.001
2.71 ± 0.06
2.47 ± 0.95
2.52 ± 0.15
6.44 ± 0.42
1.52 ± 0.10
0.17 ± 0.01
40 K
0.039 ± 0.001
2.74 ± 0.07
0.71 ± 0.16
2.81 ± 0.19
6.46 ± 0.40
1.42 ± 0.06
0.18 ± 0.02
26 P
0.040 ± 0.001
2.62 ± 0.07
5.60 ± 0.95
1.32 ± 0.08
10.14 ± 0.57
1.85 ± 0.08
0.17 ± 0.02
52 P
0.041 ± 0.002
2.66 ± 0.05
5.76 ± 1.04
1.45 ± 0.12
10.46 ± 0.72
1.85 ± 0.11
0.20 ± 0.02
20 K + 26 P
0.041 ± 0.002
2.56 ± 0.08
4.69 ± 0.81
2.83 ± 0.20
8.77 ± 0.43
1.50 ± 0.05
0.18 ± 0.02
40 K + 52 P
0.041 ± 0.001
2.69 ± 0.06
4.63 ± 0.96
3.24 ± 0.29
9.38 ± 0.57
1.63 ± 0.10
0.18 ± 0.01
3-way ANOVA F-statistics
CroSyt
0.475
0.06
0.02
0.103
1.15
0.62
3.41
Rhiz
16.746
5.76
21.71
1.478
8.40
15.97
18.79
Fert
0.810
0.90
8.86
19.195
11.65
4.04
1.75
CroSytRhiz
1.091
0.54
0.90
2.027
0.48
0.19
0.97
CroSytFert
0.898
1.02
0.66
2.578
0.61
0.52
0.71
RhizFert
1.467
0.58
1.77
1.225
0.25
0.19
0.48
CroSytRhizFert
0.830
0.70
1.01
0.567
1.41
0.86
0.85
CroSyt: cropping systems; Fert: fertilizers; Rhiz: Rhizobium; SB: sole soybean; M + B (A): maize/soybean intercropped at a spacing of 75 × 60 cm and 75 × 20 cm, maize, and soybean, respectively; M + B (B): maize/soybean intercropped at a spacing of 75 × 60 cm and 75 × 40 cm, maize, and soybean, respectively; values presented are means ± SE; at ,, and , respectively; ns = not significant; SE = standard error. Means followed by dissimilar letter(s) in a column are significantly different from each other at according to Fischer least significance difference (LSD).