Table 1. Effect of the nature of competitors on plant growth.

		Nature of the competitors		Block
		F ratio	P value	% of variance explained
Healthy central plant	Plant fresh weight	0.809	0.536	3.25
	Plant height	1.790	0.176	47.62
	Internode length	1.075	0.399	25.57
TEV-infected central plant	Plant fresh weight	1.551	0.228	11.73
	Plant height	2.320	0.094	53.22
	Internode length	1.605	0.218	17.53
TuMV-infected central plant	Plant fresh weight	1.009	0.426	11.69
	Plant height	0.586	0.677	65.88
	Internode length	0.256	0.903	41.89

Results of two-way ANOVAs with nature of the competitors and block as effects for the three possible central plants.