the effect of plant nutrition on some morphological traits and protein content of safflower under different irrigation regimes

in this study, the effect of irrigation regimes and plant nutrition were evaluated as split plot arrangment based on randomized complete block design with three replications in 2010. treatments consisted of irrigation regimes at three levels: well-irrigation, irrigation disruption at vegetative growth stage, and irrigation disruption at reproductive growth stage as main plots and combination of different levels of plant nutrition in seven levels included of control, urea, humix as organic fertilizer, biofertilizes (nitroxin (n), biosoulphoure (b), integrated fertilizer treatments (urea + humix + nitroxin), and (urea + humix + biosoulphoure) as sub plot. results showed that the the highest plants height (69.96 cm) observed in the integrated fertilizer treatment (urea+humix+biosoulphone) and (irrigation disruption at vegetative growth stage) condition and the lowest plants height (61.46 cm) observed in (irrigation disruption at vegetative growth stage)condition and nitroxin fertilizer treatment. the highest of seed protein was obtained from the irrigation disruption at reprductive growth stage with biosoulphoure fertilizer (28.91%) and the lowest it in well-irrigation with organic fertilizer (21.01%) and treatments, respectively. the number of branches per plant, biomass yield and seed yield were affected by plant nutrition treatment. the highest and lowest seed yield was obtained from (urea+humix+biosoulphone) and lowest of it in control fertilization treatments. irrigation regimes had significant affects on biomass and seed yield, so that the highest and lowest of these traits were obtained in well-irrigationand irrigation disruption at vegetative growth stage. regimes, respectively. generally, integrated fertilizer treatment (urea + humix + biosoulphoure) under well-irrigation had the beneficial effect on safflower.