Research Article

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.

TreatmentsNOCAv. PKCaMgNa
%Bray 1. mg/kgMeq/100 g

Crop. system
 SB0.039 ± 0.0012.65 ± 0.053.56 ± 0.562.20 ± 0.158.60 ± 0.411.67 ± 0.060.16 ± 0.01
 M + B (A)0.041 ± 0.0012.65 ± 0.053.50 ± 0.592.25 ± 0.177.95 ± 0.391.58 ± 0.060.18 ± 0.01
 M + B (B)0.040 ± 0.0012.67 ± 0.043.42 ± 0.662.27 ± 0.188.55 ± 0.441.62 ± 0.060.19 ± 0.01
Rhizobia
 Without0.038 ± 0.0012.59 ± 0.042.18 ± 0.402.32 ± 0.157.81 ± 0.281.50 ± 0.040.15 ± 0.01
 With0.042 ± 0.0012.72 ± 0.034.81 ± 0.522.16 ± 0.128.92 ± 0.371.75 ± 0.050.20 ± 0.01
Fertilizers
 Control0.038 ± 0.0022.61 ± 0.060.60 ± 0.171.51 ± 0.236.92 ± 0.391.59 ± 0.060.14 ± 0.01
 20 K0.039 ± 0.0012.71 ± 0.062.47 ± 0.952.52 ± 0.156.44 ± 0.421.52 ± 0.100.17 ± 0.01
 40 K0.039 ± 0.0012.74 ± 0.070.71 ± 0.162.81 ± 0.196.46 ± 0.401.42 ± 0.060.18 ± 0.02
 26 P0.040 ± 0.0012.62 ± 0.075.60 ± 0.951.32 ± 0.0810.14 ± 0.571.85 ± 0.080.17 ± 0.02
 52 P0.041 ± 0.0022.66 ± 0.055.76 ± 1.041.45 ± 0.1210.46 ± 0.721.85 ± 0.110.20 ± 0.02
 20 K + 26 P0.041 ± 0.0022.56 ± 0.084.69 ± 0.812.83 ± 0.208.77 ± 0.431.50 ± 0.050.18 ± 0.02
 40 K + 52 P0.041 ± 0.0012.69 ± 0.064.63 ± 0.963.24 ± 0.299.38 ± 0.571.63 ± 0.100.18 ± 0.01
3-way ANOVA F-statistics
 CroSyt0.4750.060.020.1031.150.623.41
 Rhiz16.7465.7621.711.4788.4015.9718.79
 Fert0.8100.908.8619.19511.654.041.75
 CroSytRhiz1.0910.540.902.0270.480.190.97
 CroSytFert0.8981.020.662.5780.610.520.71
 RhizFert1.4670.581.771.2250.250.190.48
 CroSytRhizFert0.8300.701.010.5671.410.860.85

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).