以油用向日葵品种陇葵杂2号为试验材料，研究了不同施肥处理下向日葵器官中氮磷钾的吸收积累变化，进一步分析了三要素间的相关关系。结果表明，苗期各处理根、茎中氮、磷含量最高，随生育期推进，其含量下降。根中钾素含量苗期到现蕾期下降，现蕾期到开花期其含量上升。叶片中钾素含量苗期到开花期上升，开花到成熟期有所降低。花盘中钾素含量苗期到成熟期增多，成熟期达最高。籽粒中氮素含量最高，全植株现蕾期氮素含量最高；开花期磷素、钾素含量最高。陇葵杂2号每形成100 kg籽粒，需N 6.79 kg、P2O5 1.65 kg、K2O 15.52 kg，氮、磷、钾平衡施肥比例为4.1 ∶ 1 ∶ 9.4。

In this experiment， taking sunflower Longkuiza 2 as experiment material， the authors studied the changes of absorption and accumulated of N P and K under the treatments of different fertilization of sunflower plant and different organs. Further studied the relationship of N P and K. The result shows that the root、 stem、 leaf and flower disc have the highest N and P in seeding stage， with the growth promote It decrease. K content decreased of root from Seedling to budding stage， and from bud to flowering stages of its content rise. The K content increase of leaves from seedling to budding， and it decrease from bud of flowering stage. K content increase of flower dic form seedling to maturity stage and it up to the maximum in maturity. It have highest N content in grain. It have highest N content in bud of full plant and it have highest P、 K in flowering period. In all the growth period the sunflower variety Longkuiza 2 per 100 kg grains， requiring N 6.79 kg、 P2O5 1.65 kg and K2O 15.52 kg， balanced fertilization proportion of nitrogen， phosphorus and postassium is 4.1 ∶ 1 ∶ 9.4.

S565.5

国家现代产业技术体系项目“国家向日葵产业技术体系兰州综合试验站(CARS-16)”；甘肃省科技支撑计划项目“优质丰产食用葵杂交种选育及高效栽培技术研究与示范(1011NKCA080)”；甘肃省农业科学院农业科技创新专项“向日葵高抗盐碱突变体抗性机理研究(2013GAA37)”