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 2

Effects of rhizobium inoculation, cropping systems, and the supply of P and K on soil pH, EC, and micronutrients in the rhizosphere soil measure in 2016 season.

Treatments	pH	EC	Fe	Cu	Mn	Zn
	Water 1 : 2.5	mS/cm	ppm
Crop. system
SB
M + B (A)
M + B (B)
Rhizobia
Without
With
Fertilizers
Control
20 K
40 K
26 P
52 P
20 K + 26 P
40 K + 52 P
3-way ANOVA F-statistics
CroSyt	0.7	0.98	0.33	2.51	1.57	0.93
Rhiz	4.9	0.33	12.50	24.74	35.64	27.69
Fert	4.2	2.99	0.53	1.14	1.61	1.77
CroSytRhiz	5.0	2.30	0.21	1.05	0.39	0.31
CroSytFert	1.6	1.29	1.36	1.37	0.41	0.71
RhizFert	1.1	0.90	0.60	0.23	1.26	0.84
CroSytRhizFert	0.5	1.55	0.30	0.28	0.66	0.79

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 and 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).