warzywnictwo warzywnictwo
  Mapa witryny | Dojazd     
wtorek, 17.07.2018
.
.




Informacje ogólne
- Strona główna
- O Instytucie
- Dyrekcja
- Działalność
- Struktura organizacyjna
- Rada naukowa
- Konferencje i seminaria
- Aktualności
- Dojazd
Prace badawcze
- Współpraca z zagranicą
- Projekty zagraniczne
- Projekty krajowe
- Własność intelektualna
Usługi
- Oferta usługowa
- Szkolenia
Zasoby
- Strony pracowników
- Biblioteka
Wydawnictwa
- Oferta wydawnicza
- Publikacje
- Vegetable Crops Research Bulletin

General information | Instruction for authors | Search | Select issue
 

 

 

 

 

 

 

 


VCRB :: Contents of Volume 59/2003 :: Detailed information


GENOTYPE × ENVIRONMENT INTERACTION AND STABILITY ANALYSIS 
IN DRY BULB YIELD OF ONION CULTIVARS IN THE RIFT VALLEY AREAS
OF ETHIOPIA


Shimeles AKLILU
Nazareth Research Center, P.O. Box 436, Nazareth, Ethiopia


Summary

Eight onion genotypes were studied for 3 years at 3 locations to determine their performance and stability in 9 environments. Stability differences were assessed on the basis of linear regression of genotypes on environmental index and on deviation from linear functions along with the mean yield. According to mean bulb yield over 9 environments, the highest bulb yield of 240 kg·100m-2 obtained from Nasik Red followed by Melkam 230 kg·100m-2 and the lowest bulb yield was obtained from Red Creole Select. The combined analysis of variance showed significant p<0.05 genotype, environment and genotype x environment effects on bulb yield. The regression coefficient for the 8 genotypes ranged from 0.86-1.14 and was not significantly different from unity. There is no widely adaptable genotype except the check Adama Red which had a regression coefficient close to one and mean yield equivalent to grand mean and considered fairly stable in performance across the environments. Nasik Red appeared more productive where growing conditions are favorable. Therefore, can be released for Zewai and Melkassa conditions. Whereas Early Red and Melkam were relatively resistance to changing environments and are adaptable to low yielding environments showing high potential for adverse condition of Werer. Hence, it suggested that initial selection of genotypes from any source at Werer and Melkassa produce cultivars that would be used across the diverse onion growing environments in the Rift Valley and similar areas of the country.    


keywords:onion, environment, yield, cultivar

[Back]      [Printer friendly version]