Spike, stem and leaf dry weight in barley cultivars in response to different irrigation regimes at different growth and development stages

ABSTRACT: Drought, considered as the main abiotic factor limiting yield. In order to evaluate seed yield, biological yield and harvest index of barley ,s cultivars in different treatments of drought stress, an experiment was conducted as a split plot arrangement based on randomized complete block design with 4 replications at experimental agriculture farm of Islamic Azad University, Khorasgan (Esfagan) branch, in Esfahan. Irrigation treatments as a main plot were arranged on the basis of evaporation from pan evaporation (including irrigation after 80, 100 and 120 mm evaporation from pan), and sub plots were included 4 cultivars (Fasih, Nosrat, Reihan 03 and Yosef). The irrigation was done normally from plantation until the beginning of reproductive stage. On the basis of the results, irrigation on the basis of 80 mm evaporation from evaporation pan had obtained the highest spike dry weight, leaf and stem dry weight at all experimental growth and development stages. The maximum spike dry weight at flowering stage and physiological ripening was related to Reihan and Yosef, respectively. The highest stem dry weight at tillering stage and anthesis stage was obtained in cultivation of Fasih, moreover, Nosrat obtained the maximum stem dry weight at the end of tillering, stem elongation, flowering stage and physiological ripening. The maximum lead dry weight at tillering stage, anthesis stage and flowering stage was related to Faish. The highest leaf dry weight at the end of tillering, stem elongation and physiological stage also was achieved in cultivation of Nosrat.