مطالعة ویژگیهای کمی و کیفی ارقام روز کوتاه پیاز در اصفهان

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 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