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Table 6.

Pairwise comparisons under the RCBD and split-plot analyses for the P. americana experiment

	Analysis under RCBD					Analysis under Split-plot design
Treatment comparison	T-statistic	Estimated standard error	Tukey–Cramer P-value	T-statistic	Estimated standard error	Tukey–Cramer P-value
A vs B	–0.67	1.4463	0.9076	–0.44	2.0768	0.9700
A vs C	–0.49	1.4639	0.9607	–0.32	2.0882	0.9876
A vs D	5.35	1.4697	<0.0001	3.77	2.0903	0.0120
B vs C	0.17	1.4463	0.9981	0.12	2.0767	0.9994
B vs D	6.08	1.4522	<0.0001	4.23	2.0793	0.0054
C vs D	5.84	1.4697	<0.0001	4.09	2.0908	0.0068

	Analysis under RCBD					Analysis under Split-plot design
Treatment comparison	T-statistic	Estimated standard error	Tukey–Cramer P-value	T-statistic	Estimated standard error	Tukey–Cramer P-value
A vs B	–0.67	1.4463	0.9076	–0.44	2.0768	0.9700
A vs C	–0.49	1.4639	0.9607	–0.32	2.0882	0.9876
A vs D	5.35	1.4697	<0.0001	3.77	2.0903	0.0120
B vs C	0.17	1.4463	0.9981	0.12	2.0767	0.9994
B vs D	6.08	1.4522	<0.0001	4.23	2.0793	0.0054
C vs D	5.84	1.4697	<0.0001	4.09	2.0908	0.0068