Table 3.

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

	Estimate	Std. error	t value	p value
(Intercept)	0.663	0.020	32.826	<0.001
Log copy number	−0.010	0.007	−1.425	0.155
Chitinophaga	−0.008	0.028	−0.282	0.778
Terrabacter	−0.046	0.028	−1.655	0.099
Direct coating	0.038	0.038	0.991	0.323
Alginate coating	0.071	0.030	2.378	0.018
12 h coating	0.028	0.026	1.089	0.277
Seedling priming	0.298	0.120	2.478	0.014
Soil drench	0.117	0.055	2.132	0.034
Time Week 6	0.400	0.017	23.553	<0.001
Time Week 8	0.719	0.018	41.001	<0.001
Log copy number*Direct coating	0.016	0.014	1.133	0.258
Log copy number*Alginate coating	0.006	0.012	0.537	0.592
Log copy number*12 h coating	0.025	0.011	2.261	0.025
Log copy number*Seedling priming	−0.034	0.025	−1.367	0.173
Log copy number*Soil drench	−0.005	0.013	−0.37	0.712
Chitinophaga*Direct coating	−0.047	0.034	−1.397	0.164
Terrabacter*Direct coating	0.069	0.035	1.994	0.047
Chitinophaga*Alginate coating	0.018	0.036	0.484	0.629
Terrabacter*Alginate coating	0.097	0.034	2.848	0.005
Chitinophaga*12 h coating	0.000	0.041	0.009	0.993
Terrabacter*12 h coating	0.105	0.035	2.995	0.003
Chitinophaga*Seedling priming	0.008	0.035	0.242	0.809
Terrabacter*Seedling priming	−0.083	0.076	−1.09	0.277
Chitinophaga*Soil drench	−0.019	0.034	−0.554	0.580
Terrabacter*Soil drench	0.029	0.042	0.698	0.486
Chitinophaga*Week 6	0.021	0.024	0.872	0.384
Terrabacter*Week 6	0.098	0.024	4.143	<0.001
Chitinophaga*Week 8	0.020	0.025	0.802	0.424
Terrabacter*Week 8	0.012	0.024	0.483	0.630

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.