Effect of different levels of irrigation on yield and yield components of Maize (Zea mays L.)

The effects of different irrigation regimes and verities on yield and yield components of four corn verities were studied (2004-2005). In this case an experiment was carried out in research farm of Sarab-e-Changaee related to agricultural research center of Lorestan. A split plot based on RBCD with 4 replications was used. Treatments were 3 indexes of irrigation and assigned as main plots (irrigation after 75, 100 and 120mm from class A pan) and four hybrid varieties 500, 647, 700, 704 were assigned as sub plot. Results showed that among irrigation regimes treatments of irrigation after 75 and 120 mm had highest and lowest grain yield respectively. In this way yield reduction had caused by reducing in number of row per ear and seed per row. Also the sensibility of seed yield against drought stress was more than biological yield. This fact was confirmed by harvest index. Comparison of results shows that in late mature variety the growth and yield were increased.