Reza Aminpour; Mostafa Mobli; Ahmad Mortazav Bak
Abstract
Abstract
In order to study the adaptability and bulb yield characteristics of 12 short day onion cultivars for sowing in autumn in Isfahan, an experiment was conducted at Kabootar Abad Research Station of Isfahan during two growing seasons (2007-2008 and 2008-2009). The experimental design was Randomized ...
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Abstract
In order to study the adaptability and bulb yield characteristics of 12 short day onion cultivars for sowing in autumn in Isfahan, an experiment was conducted at Kabootar Abad Research Station of Isfahan during two growing seasons (2007-2008 and 2008-2009). The experimental design was Randomized Complete Blocks with four replications. Cultivars included: 1- Pegasus, 2- Grano 6835(XP 0759 6835), 3- Hyb. Cirrus, 4- Texas Early White, 5- Hyb. Jaguar, 6- Century (EX 0759 2000), 7- Calera, 8- Hyb. Primavera, 9- Lahoya, 10- Texas Yellow Grano 502 (common cv. in region), 11- Contessa and 12- Hyb. Savannah Sweet. Seed were sown in early October and common cultural practices were followed. Analysis of variances showed that the effect of year was not statistically significant. Results showed that Hyb. Cirrus produced significantly the highest total (109.39 t/ha) and marketable yield (94.47 t/ha) and Lahoya produced the lowest total (28.19 t/ha) and marketable yield (16.17 t/ha). Total and marketable yield in Texas Yellow Grano 502 were placed after cirrus. Bulb diameter and bulb height decreased as bulb yield decreased. Among cultivars, Hyb. Jaguar with 4.66 mm and Lahoya with 2.58 mm had the thickest and thinnest bulb neck, respectively. Hyb. Contessa produced the highest bulb dry matter (10.38%) and total soluble solids (10.70%). The lowest DM and TSS were belonged to Primavera and Savannah Sweet respectively. There was a significant correlation between DM and TSS (r = +0.71). In conclusion, Hyb. Cirrus showed good adaptability and performed better than the other cultivars in Isfahan area.
Keywords: Onion, Short day cultivars, Adaptability, Bulb yield, Dry matter, Total soluble solids
Reza Aminpour; Seyyed Farhad Mousavi; Mostafa Mobli
Abstract
Abstract
In order to study the effects of irrigation regimes and plant spacing on bulb yield of two onion (Allium cepa L.) genotypes, an experiment was conducted at Kabootar Abad Research Station of Isfahan during two growing seasons (2005 and 2006). The experiment design was split-factorial with a ...
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Abstract
In order to study the effects of irrigation regimes and plant spacing on bulb yield of two onion (Allium cepa L.) genotypes, an experiment was conducted at Kabootar Abad Research Station of Isfahan during two growing seasons (2005 and 2006). The experiment design was split-factorial with a randomized complete block arrangement with four replications. Main plots included three irrigation regimes (irrigation after T1= 503 mm, T2= 703 mm and T3= 903 mm evaporation from class A pan). Sub-plots formed from factorial combination of two spring onion genotypes (Yellow Sweet Spanish and Dorcheh-Isfahan) with three plant spacing in rows (5, 7.5 and 10 cm). The results showed that total yield, marketable yield, bulb diameter and bulb height decreased as irrigation frequency increased. The highest total yield (6.867 kg/m2) and marketable yield (5.761 kg/m2) were produced in T1 treatment. Regarding total yield, the response of genotypes to increasing irrigation frequency was different. The Yellow Sweet Spanish genotype tolerated water deficit more than Dorcheh. Total yield, marketable yield and bulb height in Yellow Sweet Spanish genotype were significantly greater than Dorcheh, but diameter of bulb neck, dry matter and total soluble solids in Dorcheh were significantly greater than Yellow Sweet Spanish. Among the plant spacings, the 10 cm spacing had the lowest total and marketable yield and there were no significant differences between 5 and 7.5 cm spacing. But bulb size (height and diameter) increased as plant spacing increased.
Keywords: Onion, Irrigation regime, Spring genotypes, Bulb yield.
