Allelopathic Potential of Green Manure Cover Crops on Germination and Early Seedling Development of Goose Grass [Eleusine indica (L.) Gaertn] and Blackjack (Bidens pilosa L.)

Table 7

Effect of soil incorporated residues of different plant parts of cover crops on emergence (%), dry weight, and seedling vigor index (SVII) of blackjack.

Cover crop	Leaf	% inhibition	Stem	% inhibition	Root	% inhibition	Mean % inhibition	Rank
Emergence (%)
Control	67.0^a		67.0^a		67.0^a
Hyacinth bean	8.0^c	88	14.0^dc	79	12.0^de	82	83	2
Red sunnhemp	8.0^c	88	29.0^bc	57	19.0^cde	72	72	4
Showy rattlebox	39.0^b	42	24.0^bc	64	5.0^e	93	66	8
Common bean	4.0^c	94	29.0^bc	57	31.0^bc	54	68	7
Common rattlepod	34.0^b	49	34.0^b	49	35.0^b	48	49	10
Radish	6.0^c	91	28.0^bc	58	27.0^bcd	60	70	5
Tephrosia	11.0^c	84	4.0^d	94	10.0^e	85	88	1
Black sunnhemp	9.0^c	87	29.0^bc	57	36.0^b	46	63	9
Dry weight (g)
Control	0.074^a		0.074^a		0.074^a
Hyacinth bean	0.009^c	88	0.01^dc	86	0.008^c	89	88	1
Red sunnhemp	0.020^bc	73	0.046^b	38	0.018^bc	76	62	8
Showy rattlebox	0.047^b	36	0.029^c	61	0.044^b	41	46	10
Common bean	0.014^c	81	0.028^c	62	0.037^bc	50	64	6
Common rattlepod	0.018^c	76	0.030^c	59	0.028^bc	62	66	7
Radish	0.021^bc	72	0.041^b	45	0.035^bc	53	56	9
Tephrosia	0.017^c	77	0.001^d	99	0.022^bc	70	82	2
Black sunnhemp	0.023^bc	69	0.023^dc	69	0.023^bc	69	69	4
Seedling vigor index (SVII)
Control	2.30^c (5.007)		2.30^c (5.007)		2.30^c (5.007)
Hyacinth bean	0.77^a (0.087)	98	0.83^ab (0.190)	96	0.79^a (0.132)	97	97	1
Red sunnhemp	0.83^a (0.200)	96	1.36^c (0.401)	92	0.92^abcd (0.359)	93	94	7
Showy rattlebox	1.50^b (0.914)	82	1.15^abc (0.031)	99	0.83^ab (0.197)	96	92	10
Common bean	0.76^a (0.082)	98	1.15^abc (0.873)	83	1.29^de (1.207)	76	86	6
Common rattlepod	0.99^a (0.560)	89	1.19^bc (0.980)	80	1.12^abcde (0.820)	84	84	8
Radish	0.82^a (0.192)	96	1.27^bc (1.224)	76	1.21^cde (1.016)	80	84	9
Tephrosia	0.85^a (0.225)	96	0.72^a (0.016)	100	0.85^abc (0.242)	95	97	2
Black sunnhemp	0.87^a (0.280)	94	1.07^abc (0.660)	87	1.16^bcde (0.960)	81	87	4

Means followed by the same letter in the same column are not significantly different at . , , represent species with mean inhibition over control ≥80%, ≥50%, and ≥20%, respectively. Data were √ (x + 0.5) transformed. Untransformed data given in brackets were used to calculate the inhibition percentages.