Table 2.

Summary of small and large plot trials used to measure maize yield response to inoculation, 2005–11

Type of trial	Sample size, n	Yield increase (t/ha ± s.e.)	95% CI*	Increase %	Paired t-test	Z-test (C† v. I‡)
Small plot	92	0·17 ± 0·044	0·08–0·26	1·8	Prob > t < 0·001	<0·001
Large plot	369	0·33 ± 0·026	0·28–0·38	3·5	Prob > t < 0·001	0·000

^*Confidence interval.

^†Control.

^‡Inoculated.