evaluation of some physiological, morphological and phonological characteristics in sunflower (helianthus annuus l.) influenced by biological and chemical sources of nitrogen and phosphorus

in order to study the effect of biological and chemical fertilizers of nitrogen and phosphorus on some physiological, morphological and phenological traits of sunflower this study was carried out in eivanegharb (ilam province) in summer of 2011. treatments were arranged in split factorial based on rcbd with three replications. the main plot include 4 levels of phosphorus and nitrogen chemical fertilizer (0, 33, 66 and 100% of nitrogen and phosphorus fertilizer requirements) and subplot includes factorial of nitroxin and phosphate barvare2 application with two levels (inoculation and noninoculation) the results showed ntroxin application had a significant increase (8.4 percent) in a chlorophyll. chemical fertilizers use had a significant effect on sunflower morphological characters, so that the use of 100% required chemical fertilizer compared to the control increased sunflower stem height 4.92 percent. nitroxin and phosphate barvare2 interaction had a significant decrease effect on gdd needed until budding, so that in nitroxin absence, phosphate barvare2 application, reduced the amount gdd needed until budding sunflower (38 units). seed ccompared to the non-inoculation increased gdd needed for sunflower grain filling 2.25 and 2.60 percent respectively. finaly base on this study can explain that sunflower seed inoculation with nitoxin and phosphat barvar2 biofertilizer in addition chemical fertilizer application, yield will increase trough improvement of different traits