مقایسه کمّی و کیفی توده های بذر جو انبار شده در فضای باز قبل از بوجاری

This study was conducted to compare the quantitative and qualitative characteristics of stored barley seed lots in outdoor in Khorasan Razavi Agricultural and Natural Resources Research Center, a factorial experiment carried out based on randomize complete design with three replications at three main seed processing center in Mashhad, Torbatjam and Torbatheydaryeh for one year from June 2005. The First factor was three barley varieties including Reyhan, Nosrat & Makoei. The second factor was duration of exposure to direct sunlight for 0, 15, 30 and 45 days as an open storage before processing. Traits under studied were including moisture content, hectolitre weight and seed loss percentage, germination percentage, seedling vigor index and germination rate. Compound analysis of variance for data, showed that barley variety had significant effect on hectolitre weight and seed loss percentage. Duration of exposure to direct sunlight showed a significant effect on all traits exept hectolitre weight. Also intraction between variety × duration of exposure to direct sunlight had significant effect on all traits. Generally, barley seed lots exposured to direct sunlight showed decreasing in moisture content, hectolitre weight and seed germination quality and also increasing in seed loss percentage after processing. It is necessary that barley seed lots be protected from long time exposure to sunlight after harvesting and before processing.