Effect of the Irrigation Interval and Nitrogen Rate on Yield and Yield Components of Onion (Allium cepa L.) at Arba Minch, Southern Ethiopia
Table 6
Interaction effect of the irrigation interval and N rate on yield and yield components of onion.
Treatment
Bulb length (cm)
Bulb diameter (cm)
Average bulb weight (g)
Total biomass (t ha−1)
Marketable bulb yield (t ha−1)
Unmarketable bulb yield (t ha−1)
Total bulb yield (t ha−1)
Harvest index (%)
Irrigation interval (day) N (kg·ha−1)
3
0
5.13
5.51de
62.13c
29.35f
21.54d
3.56
25.10d
82.65
50
5.71
6.17c
70.6b
36.48b
28.86b
2.78
31.65b
86.75
100
7.02
6.18a
79.6a
41.59a
33.70a
2.57
36.27a
87.22
150
7.48
6.83a
82.00a
41.84a
34.12a
2.63
36.75a
87.87
6
0
5.11
5.54dc
64.53c
29.72f
23.23d
2.43
25.67d
82.19
50
5.27
6.13c
73.10b
36.64b
30.31b
2.01
32.33b
88.20
100
6.27
6.44b
78.47a
40.31a
33.56a
1.76
35.34a
87.66
150
7.01
6.58ab
80.76a
40.69a
33.20a
2.02
35.22a
86.58
9
0
4.57
4.54g
40.86g
26.12h
18.61e
3.29
21.90e
78.43
50
5.11
5.37e
46.23ef
31.52de
22.61d
2.52
25.13d
79.73
100
5.83
5.58ed
49.86ed
33.27c
25.99c
1.77
27.76c
83.40
150
6.28
5.66d
53.10d
32.54cd
25.87c
2.13
28.00c
86.15
12
0
4.04
3.66h
31.57i
22.34i
15.14f
3.18
18.32f
76.68
50
4.45
4.62g
35.46hi
27.65g
18.37e
3.29
21.67e
78.34
100
5.34
5.03f
39.93gh
29.69f
21.72d
2.45
24.17d
81.52
150
5.53
5.38e
42.53fg
30.54ef
21.43d
2.46
23.89d
77.64
CD (<0.05)
NS
0.09
1.6
0.65
0.79
NS
0.85
NS
SEM (±)
0.08
0.02
4.91
0.80
1.21
0.12
1.41
8.05
CV (%)
5.15
2.45
3.81
2.69
4.32
13.48
4.24
3.41
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 mean, CV = coefficient of variation, and NS = nonsignificant.