Effect of the Irrigation Interval and Nitrogen Rate on Yield and Yield Components of Onion (Allium cepa L.) at Arba Minch, Southern Ethiopia
Table 5
Main effects of the irrigation interval and nitrogen rate on yield and yield components of onion.
Treatment
Bulb length (cm)
Bulb diameter (cm)
Average bulb weight (g)
Total biomass (t ha−1)
Unmarketable bulb yield (t ha−1)
Marketable bulb yield (t ha−1)
Total bulb yield (t ha−1)
Harvest index (%)
Irrigation interval (days)
3
6.33a
6.33a
73.45a
37.32a
2.88a
29.55a
32.44a
86.12a
6
5.91b
6.17a
74.22a
36.84a
2.05b
30.08a
32.14a
86.16a
9
5.45c
5.29b
47.57b
30.86b
2.42b
23.27b
25.69b
81.93b
12
4.84d
4.67c
37.37c
27.61c
2.84a
19.16c
22.01c
78.54b
CD(<0.05)
0.24
0.17
2.03
0.65
0.17
1.32
1.54
3.84
SEM (±)
0.06
0.06
4.11
0.43
1.74
0.14
2.36
14.80
CV (%)
4.24
3.09
3.48
1.97
14.83
5.16
5.48
4.62
N (kg·ha−1)
0
4.71d
4.81d
49.77d
26.88c
3.12a
19.63c
22.74c
79.99b
50
5.14c
5.57c
56.35c
33.07b
2.65b
25.04b
27.69b
83.25a
100
6.12b
5.96b
61.83b
36.22a
2.13c
28.65a
30.88a
84.95a
150
6.58a
6.12a
64.65a
36.45a
2.31c
28.75a
30.96a
84.56a
CD (<0.05)
0.25
0.11
1.90
0.76
0.25
0.87
0.91
2.13
SEM (±)
0.09
0.02
5.11
0.89
0.11
1.08
1.18
6.36
CV (%)
5.35
2.27
3.88
2.85
13.11
4.07
3.86
3.03
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, and CV = coefficient of variation.
