Distribution and Impact of Parthenium (Parthenium hysterophorus L.) on Weed Species Diversity in Maize Fields in Western Gojjam Zone, Amhara National Regional State, Ethiopia

Table 3

Similarity index of aboveground weed species among parthenium infestation levels.

Similarity	Number of weed species			Similarity index (%)
	On both infestations	1^st infestation	2^nd infestation
NPIL vs. VLPIL	66	32	6	63.46
NPIL vs. LPIL	61	37	7	58.10
NPIL vs. MPIL	33	65	4	32.35
VLPIL vs. LPIL	48	24	20	52.17
VLPIL vs. MPIL	28	44	9	34.57
LPIL vs. MPIL	29	39	8	38.16

NPIL=no parthenium infestation level, VLPIL=very low parthenium infestation level, LPIL = low parthenium infestation level, MPIL = moderate parthenium infestation level.