Table 4. Four-way ANOVA on the rhizosphere soil densities of rhizobacterias inoculated in the potted soil of Bt maize and its parental line of non-Bt maize grown under ambient and elevated CO₂ in 2016 and 2017.

Impact factors	Sampled soil at the maize seedling after 14 days		Sampled soil at the maize harvest
	AB	AC	AB	AC
Ya	0.00/0.99	0.002/0.96	0.97/0.33	1.13/0.29
Cv.b	0.32/0.574	0.36/0.55	0.070/0.79	0.080/0.78
CO2c	0.19/0.89	0.80/0.38	26.01/<0.001***	331.16/<0.001***
Rhizobacteriad	2555.00/<0.001***	1380.37/<0.001***	1311.83/<0.001***	2080.71/<0.001***
Y × Cv.	0.62/0.44	1.96/0.17	0.18/0.673	0.53/0.47
Y × CO2	1.21/0.28	2.50/0.12	0.74/0.40	0.032/0.86
Y × Rhizobacteria	0.00/1.00	0.02/0.99	0.97/0.39	1.13/0.33
Cv. × CO2	0.35/0.55	0.010/0.92	0.32/0.57	0.36/0.55
Cv. × Rhizobacteria	0.32/0.73	0.36/0.70	0.070/0.93	0.80/0.93
CO2 × Rhizobacteria	0.019/0.98	0.80/0.45	26.01/<0.001***	331.16/<0.001***
Y × Cv. × CO2	5.99/0.018*	0.06/0.94	0.82/0.37	0.63/0.43
Y × Cv. × Rhizobacteria	0.62/0.54	1.96/0.15	0.18/0.84	0.53/0.59
Y × CO2 × Rhizobacteria	1.21/0.31	2.50/0.093	0.74/0.49	0.032/0.97
Cv. × CO2 × Rhizobacteria	0.35/0.70	0.10/0.99	0.32/0.73	0.36/0.70
Y × Cv. × CO2 × Rhizobacteria	5.99/0.05	0.006/0.99	0.82/0.45	0.63/0.54

Notes:

^*P < 0.05;

^**P < 0.01;

^***P < 0.001.

^aYear (2016 vs. 2017).

^bTransgenic treatment (Bt maize vs. non-Bt maize).

^cCO₂ levels (elevated CO₂ vs. ambient CO₂).

^dRhizobacteria infection (A. brasilense and A. chroococcum vs. the control buffer), the same as in Tables 5 and 7.