Effects of irrigation intervals, plant growth promoting Rhizobacteria and humid acid on yield and yield components of wheat (Kavir cultivar)

The effect of irrigation intervals، humic acid and plant growth promoting Rhizobacteria (Azotobacter، Azospirillum pseudomonas) was studied on yield and yield components of wheat (Kavir cultivar) in Fashafuyeh region، Iran in 2010-2011. Experiment was carried out as split factorial based on a randomized complete block design with four replications. Main Factor was irrigation at three levels (irrigation after 80، 120 and 160 mm evaporation from class A evaporation pan) and humid acid and plant growth promoting Rhizobacteria at two levels of application and non-application were considered as sub-factors. The result indicated that water stress significantly decreased seed yield duo to a decreased seed numbers per spike. Water stress also decreased biological yield، significantly. Application of plant growth promoting Rhizobacteria significantly effected seed yield and harvest index percentage. Besides، application of humid acid increased spike number per unit area and biological yield in high stress condition (irrigation after 160 mm evaporation from class A evaporation pan). According to the results، application of plant growth promoting Rhizobacteria and humid acid as two important biological fertilizers can reduce inverse effect of water deficit stress on yield and yield components of wheat.