Effect of Mycorrhizal and Phosphate Barvar 2 on Yield and Yield Components and Oil Content of Safflower (Carthamus tinctorius L. cultivar soffeh) under Drought Stress

The effect of bio fertilizers of Mycorrhiza and phosphate Barvar2 on yield of safflower cultivar soffeh under drought stress were investigated in a Research Farm Faculty of Agriculture at Yasouj University in 2016, as split plot Experiment randomized complete block design with three replications. Main factor included droughtt stress in three stages (full irrigation, flowering and pollination stage, and grain filling stage) and bio fertilizers as sub factor were included control or no application Bio fertilizer, Phosphate Barvar 2, Arbuscular mycorrhiza, and Arbuscular mycorrhiza + Phosphate Barvar 2. Application of bio fertilizers increased the grain yield components including number of fertilie head, number of grain per head and 1000-grain weight. The highest grain yield (3413 kg.ha-1) was obtained in conventional irrigation treatments and the combined application of biofertilizers, arbuscular myrrhiza and phosphate Barvar2, and the lowest grain yield (1451 kg.ha-1) in stress at flowering stage and in the absence of bio fertilizer application. Stress at flowering stage reduced the grain yield. The highest percentage of grain oil was obtained in conventional irrigation treatments and integrated application of bio fertilizers, and the lowest percentage of grain oil was due to grain filling stage stress and non-application of bio fertilizers. Drought stress at flowering and grain filling stages reduced grain yield, oil yield and grain oil content. Application of biofertilizers in drought stress conditions with improvement in yield components increased the mentioned traits in compared with non-application of biofertilizers.