The effects of plant density and irrigation periods on growth idices of safflower

In order to study the effects of plant density and irrigation periods on growth indices of Safflower (Carthamus tinctoeius) (Mohally Esfahan) an experiment conducted in Kerman in 2005. completely randomized blocks design in four replicates split plotly. The experimental designe was included irrigation period (I1= 7، I2= 12، I3=17 every days) and plant density (D1=20، D2=30، D3=40 in each square). The results showed that during every 17 day irrigation period، The plant got to tubudding. Flowering and ripening period sooner than the other irrigation periods. The most leaf growth index (3. 21، 3. 17 was during). The first irrigation period (every 7 days) and the first plant density (20 plants in each squar metre). Also crop growth rate (CGR) increased (7. 9، 784) during the treatment of first irrigation period and the first density. The most ratio growth rate (RGR) was during the first density and the first irrigation period (37 days of planting). As a whole the results showed with increasing irrigation period and plant density in each square metre، leaf erea index and plant growth rate reduced، because of the plant، respiration increasing، internal and outernal competition.