Isabgol (plantago ovata Forsk.) response to irrigation intervals and different nitrogen levels

This experiment was conducted in Khosheh Sabz Sonboleh Institute in Fasa during 2007-2008. In this study Isabgol (plantago ovata Forsk.) yield reaction and quality characteristics of irrigation intervals and different levels of nitrogen were studied. Completely random design with 3 replications was used. Factors included 3 irrigation intervals (7, 10 and 14 days) and 3 nitrogen levels (0, 30 and 60 kg). Variance results showed that variations of grain yield, biological yield and mucilage yield were significant. Drought intensity also increased percentage of mucilage yield significantly. The best economic and biological quality was obtained by short irrigation interval. In long irrigation interval, two characteristics showed significant decrease, but against biological yields, they showed increased trend. Therefore, with increased amount of nitrogen, economic yield, biological yield and mucilage were increased. Grain and biological yield in drought stress condition in long irrigation intervals showed less response than increasing nitrogen levels.