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YIELD AND YIELD COMPONENT ANALYSIS OF ONION CULTIVARS
GROWN IN ARID REGIONS
ABDULLAH A. ALSADON
Department of Plant Production, College of Agriculture, King Saud University, P.O. Box 2460, Riyadh 11451, Saudi Arabia
INTRODUCTION
OBJECTIVES
* To evaluate yield performance of eleven onion cultivars
under the arid conditions of Riyadh area.
* To determine yield stability differences among onion
cultivars.
MATERIALS AND METHODS
Cultivar performance trial
* Eleven onion cultivars were used ( Table 1 )
Study conducted at the Agricultural Research and
Experiment Station of the College of Agriculture,
at Dirab near Riyadh, Saudi Arabia during the 1997
and 1998 seasons.
The temperature and relative humidity data were
recorded.
Transplants were grown under greenhouse conditions
for 45 days.
* Transplanting was carried out on 7 January 1997 and on
29 December 1997 for the first and second seasons,
respectively.
The field layout was a complete randomized design with
three replications.
Plots consisted of nine rows, each 3 m long and .7 m
wide. The distance was 15 cm between plants and 75 cm
between rows.
Common cultural practices were performed.
Harvesting was carried out on 19 May 1997 and on 15
May 1998 for the first and second seasons, respectively.
Yield and yield components studied:
Yield (ton/ha)
Bulb weight
Bulb diameter
Bulb length
Dry matter
Yield stability analysis was assessed.
RESULTS AND DISCUSSION
* Significant differences between cultivars and
among growing seasons.
* Significant cultivar x season interactions were
significant for mean yield and other yield traits.
0
5
10
15
20
25
30
Yie
ld (
ton
ha-1
)
CL CN RC DR RM RS RT TG TE UG YS
Cultivars
First Season Second Season
b
Fig 1. Yield of eleven onion cultivars as influenced by growing season . See table 1 for full listing of cultivars.
Fig 2. Bulb weight of eleven onion cultivars as influenced by growing season . See table 1 for full listing of cultivars.
0
50
100
150
200
250
300
Bu
lb w
eig
ht
(g)
CL CN RC DR RM RS RT TG TE UG YS
Cultivars
First Season Second Season
Fig. 3. Bulb diameter of eleven onion cultivars as influenced by growing season . See table 1 for full listing of cultivars.
0
2
4
6
8
10
12
Bu
lb D
iam
eter
(cm
)
CL CN RC DR RM RS RT TG TE UG YS
Cultivars
First Season Second Season
Fig. 4. Bulb height of eleven onion cultivars as influenced by growing season . See table 1 for full listing of cultivars.
0
1
2
3
4
5
6
7
8
9
Bu
lb h
eig
ht
(cm
)
CL CN RC DR RM RS RT TG TE UG YS
Cultivars
First Season Second Season
Fig. 5. Dry matter of eleven onion cultivars as influenced by growing season . See table 1 for full listing of cultivars.
0
5
10
15
20
25
Dry
mat
ter
(%)
CL CN RC DR RM RS RT TG TE UG YS
Cultivars
First Season Second Season
a
5 10 15 20 25
Mean yield (ton/ha)
Re
su
lts
of
t-te
st
RMRM
DR
RM
RM
RCRMRMRMRMRM
RM
bi>1
bi>1
bi>1
Fig. 5. Dry matter of eleven onion cultivars as influenced by growing season . See table 1 for full listing of cultivars.
CONCLUSIONS