Table 4.

Linear model testing the effect of the degree of colonization (log copy number), bacterial strain, inoculation method, and their interactions on sorghum shoot dry weight.

	Estimate	Std. error	t value	p value
(Intercept)	0.760	0.025	30.299	<2e-16
Log copy number	−0.014	0.009	−1.541	0.125
Chitinophaga	0.000	0.034	0.002	0.998
Terrabacter	−0.011	0.035	−0.308	0.758
Direct coating	0.025	0.047	0.527	0.599
Alginate coating	0.107	0.037	2.885	0.004
12 h coating	0.042	0.032	1.295	0.197
Seedling priming	0.331	0.150	2.214	0.028
Soil drench	0.073	0.068	1.063	0.289
Week 6	0.478	0.021	22.660	<2e-16
Week 8	1.192	0.022	54.715	<2e-16
Log copy number*Direct coating	0.022	0.017	1.282	0.201
Log copy number*Alginate coating	−0.003	0.015	−0.181	0.857
Log copy number*12 h coating	0.026	0.014	1.842	0.067
Log copy number*Seedling priming	−0.040	0.031	−1.310	0.192
Log copy number*Soil drench	0.003	0.017	0.203	0.840
Chitinophaga*Direct coating	−0.028	0.042	−0.671	0.503
Terrabacter*Direct coating	0.025	0.043	0.575	0.566
Chitinophaga*Alginate coating	0.044	0.045	0.974	0.331
Terrabacter*Alginate coating	0.065	0.042	1.546	0.123
Chitinophaga*12 h coating	0.012	0.050	0.248	0.805
Terrabacter*12 h coating	0.077	0.044	1.773	0.077
Chitinophaga*Seedling priming	0.038	0.043	0.882	0.379
Terrabacter* Seedling priming	−0.115	0.094	−1.221	0.223
Chitinophaga*Soil drench	0.001	0.042	0.014	0.989
Terrabacter*Soil drench	0.020	0.052	0.388	0.699
Chitinophaga*Week 6	0.023	0.030	0.790	0.431
Terrabacter*Week 6	0.000	0.029	0.003	0.998
Chitinophaga*Week 8	−0.001	0.030	−0.024	0.981
Terrabacter*Week 8	−0.006	0.030	−0.210	0.834

Backward selection was performed and the non-significant interactions (log copy number^*strain, log copy number^*sampling time, and treatment^*sampling time) were removed from the model.