Response of Yield and Yield Components of Barley Cultivars to Supplementary Irrigation under Rainfed Condition

The aim of this research was to study the response of yield and yield components of barley cultivars to supplementary irrigation under rainfed condition. So, irrigation treatment in 3 levels (without irrigation and irrigation at flowering and seed filling stages) and five barley cultivars (local cultivar, Abidar, Valfajr, Bahman and Makuei) were evaluated as a factorial experiment base on randomized complete block design with three replications. Experiment was carried out at the Research Station of Bu-Ali Sina University, during 2010-2011 growing season. Results showed that all traits were affected by irrigation and cultivar treatments. Also, supplementary irrigation × cultivar interaction was significant for biological yield. In comparison with control (non irrigation), supplementary irrigation significantly increased number of grains per spike, 1000-seed weight, biological yield, grain yield and harvest index; this increasing for grain yield in treatments of supplementary irrigation at flowering and seed filling stages was 45 and 90 percentage, respectively. Among the different cultivars, Valfajr cultivar had highest biological yield and grain yield (544 and 233 grams per square meter), respectively. In general, the results of present research showed that supplementary irrigation has an important role in improving of barley yield and economy of farmers.