The Effect of Nitroxin Application and Drought Stress on Growth and Yield of Two Persian and Iraqi Celery Populations

To investigate the effect of drought stress and nitroxin biological fertilizer on two Iranian and Iraqi celery papulations, an experiment was designed and done in the research greenhouse of the Faculty of Agriculture, Ferdowsi University of Mashhad in 2016-2017. This three-full randomized factorial experiment was performed with three replications. The first factor is drought stress in three levels include: control (100% of field capacity), moderate stress (70% of field capacity) and severe stress (40% of field capacity), the second factor is using nitroxin in seed treatment in three concentrations of zero (control), 15 mM and 30 mM and the third factor is the cultivar type at two levels (Iranian celery mass, Iraqi celery mass). According to the results of this study, it was found that different studied cultivar type showed different responses. Use of drought stress in the plant in both type compared to the control treatment reduced the growth traits. In Iraqi celery papulation, use of nitroxin at 15 mM concentration and in Persian celery papulation, use of 30 mM nitroxin concentration had the greatest effect on growth traits such as: leaf area, height, plant dry weight, leaf chlorophyll content and plants Stomatal conductance. The fresh weight of the plant was strongly affected by drought stress and use of nitroxin at different levels of drought stress prevented from the significant reduction in fresh weight of the plant in both Iranian and Iraqi celery papulation.