A Case of Cyperus spp. and Imperata cylindrica Occurrences on Acrisol of the Dahomey Gap in South Benin as Affected by Soil Characteristics: A Strategy for Soil and Weed Management

Table 4

Pearson correlation values (𝑅) and its probabilities (𝑃) between Cyperus spp. and Imperata Cylindrica and soil different ratios in K : Mg and Ca : Mg at each topographic position.

		Correlation (𝑅) and probability value (𝑃)
		Cyperus spp.		Imperata Cylindrica
		𝑅	𝑃	𝑅	𝑃
K : Mg	SUM	−0.703	0.0002	0.397	0.021
	US	0.853	<0.0001	0.482	0.007
	MS	0.956	<0.0001	−0.338	0.032
	FS	0.273	0.290	0.378	0.034
Ca : Mg	SUM	0.843	<0.0001	−0.231	0.195
	US	0.839	<0.0001	0.066	0.729
	MS	0.822	<0.0001	−0.839	<0.0001
	FS	−0.094	0.719	−0.743	<0.0001

SUM: Summit; US: upper slope; MS: middle slope; FS: foot slope.