تاثیر تیمار کردن بذر با پلی اتیلن گلایکول و رژیم های آبیاری بر عملکرد، اجزای عملکرد و روغن دانه کنجد

Abstract

The role of sesame oil in human nutrition is clear and water limitation decreases production and oil yield of sesame. This study was conducted to evaluate the effects of seed treatment and irrigation regimes on sesame yield, yield component and oil percentage. A split-plot arrangement was used in a randomized complete block design with three replications. Main-plot consisted of four irrigation regimes (50, 60, 70 and 80% soil moisture depletions of available water) and sub-plot consisted of two seed treatments (osmopriming with solution -2 bar PEG and untreated seed as control). The studied characteristics were number of days from planting to emergence, 50% flowering, capsule formation, physiological ripening, plan height, LAI, number of capsule per plant, number of seed per capsule, 1000-grain weight, grain yield, biological yield, harvest index and oil yield. The results showed that irrigation regime had no significant effect on number of days from planting to seed emergence, 50% flowering, number of seed per capsule, seed weight and biological yield. Seed treatment had significant effect on all studied traits except number of days from planting to 50% flowering, seed per capsule, seed weight, biological yield and harvest index. Also, interaction between irrigation regimes and priming was significant on 1000-grain weight and oil yield. The highest grain and oil yield obtained from 50% soil moisture depletions and the lowest obtained from 80% soil moisture depletions. The highest grain and oil yield obtained from osmopreming and the lowest grain and oil yield was obtained under control (unprimed). The 50% soil moisture depletions with osmopriming had the highest seed weight and oil yield while irrigation regime 80% soil moisture depletions with control had the lowest oil yield. Based on overall results, osmopriming with -2 bar PEG under70% was the most suitable treatment.