Effects of N, P and K Fertilizers on yield and fertilizer efficiency of oil sunflower

In order to investigate the effects of fertilization on yield, and the nutrient utilization and absorption of oil sunflower, nine field experiments were carried in Hetao areas and Tumochuan plain of Inner Mongolia from 2008 to 2010. The results show that the oilsunflower yields are increased by 20.5% and 14.4% and 11.5% when the nitrogen and potassium and phosphorus fertilizer are used respectively. The increased oil sunflower seed yields per kilogram N and P2O5 and K2O are 3.5 kg and 5.0 kg and 4.6 kg respectively, and the N and P2O5 and K2O fertilizer use efficiencies are 34.3% and 14.8% and 50.2%. About N 4.99 kg,P2O5 1.74 kg and K2O 6.78 kg are needed to produce 100 kg oil sunflower seeds. All these indexes are important to the scientific fertilization for oil sunflower.