اثرات تاريخ و فاصله كاشت بر عملكرد و جوانه زني بذر پياز رقم تگزاس ارلي گرانو502

Effect of planting date and intra-row spacing on seed yield and germination of onion (Allium cepa L.cv.Texas Early Grano 502)

In order to studying effects of planting dates and intra-row spacings on quantitative traits and germination of onion seed (Allium cepa L.cv. Texas Early Grano 502) an experiment was conducted in Kabootar Abad Research Station of Isfahan during two growing seasons (1998-1999 and 1999-2000). The experiment design was a split plot with a randomized complete block arrangement and four replications. Main factor included four planting dates (from the 22nd September every 15 days), and sub factor included three intra-row spacings (10,20 and 30 centimetres). The number of umbels/m2,capsules/umbel and seeds/capsule were increased significantly in first and second planting dates as compared with third and fourth.Among planting dates, the third planting date had the lowest 1000 seeds weight.Seed yield and umbels/m2 increased significantly as plant space dereased from 30 to 10 centimeters. The means of Capsules/umbel and 1000 seed weight reduced in 10 cm plant spacing as compared with the others. Among yield components, umbels/m2 had the most contribution in the seed yield.Planting dates and plant spacings didnot have significant effects on the seed germination percent. The seed germination rate in first and second planting dates was higher than the two others, but plant spacings didn’t have any significant effects on this trait.