Effect of the Irrigation Interval and Nitrogen Rate on Yield and Yield Components of Onion (Allium cepa L.) at Arba Minch, Southern Ethiopia

Table 4

Interaction effect of the irrigation interval and N rate on growth parameters of onion.

Treatment		Plant height (cm)	Number of leaves per plant	Leaf length (cm)	Days to maturity
Irrigation interval (day)	N (kg·ha^−1)
3	0	54.87^fg	10.47^e	44.06	95.00^d
	50	59.73^cd	11.26^d	48.40	98.00^c
	100	62.28^bc	13.16^a	50.06	104.66^a
	150	66.13^a	13.40^a	54.06	106.33^a
6	0	56.53^ef	10.43^e	46.27	94.66^d
	50	58.53^de	12.10^c	47.53	96.33^cd
	100	61.76^bc	12.66^b	51.80	102.00^b
	150	64.20^ab	12.33^b	52.70	104.67^a
9	0	51.46^hi	8.00^g	44.20	85.66^e
	50	53.93^gh	9.03^f	45.70	90.00^e
	100	55.90^fg	9.25^f	48.46	90.67^e
	150	57.00^ef	9.40^f	49.31	91.33^e
12	0	43.80^l	5.60^l	37.20	81.66^h
	50	49.20^l	6.56^h	41.60	84.88^g
	100	51.76^h	6.48^h	45.33	85.33^fg
	150	52.36^h	6.56^h	46.53	86.66^f
CD (<0.05)		0.99	0.18	NS	0.78
SEM (±)		1.88	0.06	2.23	1.11
CV (%)		2.44	2.58	3.16	1.15

Means followed by the same letter within a column are not significantly different at a 5% probability level according to Duncan’s multiple range tests, CD = critical difference, SEM = standard error of the mean, CV = coefficient of variation, and NS = nonsignificant.