Effects of Different Levels Drought Stress and Plant Density on Yield and Yield Components of Corn (Zea mays, SC. 704)

To study the effects of different levels of irrigation cuttings and plant densities on yield , and yield components of corn (SC 704), an split plot experiment based randomized complete block design, with three replication was conducted in Damghan, Iran. Main plots were 4 cuttings of irrigation: (jointing, tasseling, milking and seed hardening stages) and sub plots consisted of four plant density: 45000, 60000, 75000 and 90000 plants per hectare). Result showed that corn tolerated the last of irrigation cutting as corn pared to its cutting at other stages and has increased yield. Cutting of irrigation at seed hardening stage, increased number of seeds per ear row, number of rows per ear, and 100 kernel weight. While when plant density increased seed yield, number of seeds per row, number of rows on ear, and 100 kernel weight decrease.