Evaluation of the effect of drought stress on seed yield and its components in oat (Avena sativa L.) cultivars

摘要

Water deficit is an important yield-decreasing factor in small-grain cereals. Drought affected crop productivity nearly as much as all other environmental factors combined. To study the effect of water deficit stress on seed yield, yield components and phenological characters in oat (Avena sativa) cultivars, two experiments at stress and non-stressed conditions (irrigation after depletion 80 and 50% of soil available water, respectively) were conducted. This study was conducted in a randomized complete block design (RCBD) with 10 cultivars of oat and three replications at the research farm, Faculty of Agriculture, Shahrekord University of Iran in the years 2004 and 2005. The results obtained from this study showed that the cultivars were significantly different in most of the studied traits and their response to water deficit stress was different. The results of ANOVA for seed yield and yield components showed that the effect of year on most traits was significant, but the effect of year x cultivar interaction was not significant for most characteristics. In general, the results showed that Paser cultivar gave highest seed yield and its components in drought stressed and non-stressed conditions.