Effects of Nitrogen,Phosphorus and Potassium Fertilizers on Yield and Quality of Oil-sunflower

Field experimental design was "3414" randomized complete block with 3 replications to study the effect of nitrogen,phosphorus and potassium application amount on the seeds yield,oil content,oil yield,protein content and protein yield of sunflower.Result from the experiment shows that in terms of effect of fertilization on seed yield and oil yield,the 3 single-factor fertilizers were in the order of P2O5﹥N﹥K2O;while in terms of effect on protein yield was in order of K2O﹥N﹥P2O5.greater amount of N fertilizer increased protein content and decreased oil content,greater amount of P fertilizer increased oil content and no significantly effect on protein content,greater amount of K fertilizer increased protein content and decreased oil content.Based on the fertilization models for seed yield,oil yield and protein yield,in order to get the seed yield of 217.5 kg/667m2,oil yield of 90.9 kg/667m2 and protein yield of 35.5 kg/667m2,the optimum fertilization rate should be recommended as N=9.9 kg/667m2,P2O5=6.3 kg/667m2,K2O=8.8 kg/667m2;N=8.5 kg/667m2,P2O5=6.6 kg/667m2,K2O =8.5 kg/667m2;N=9.6 kg/667m2,P2O5=6.6 kg/667m2,K2O=10.2 g/667m2,respectively.