向日葵在我国还是个新兴作物,有关肥料施用方面的资料尚少.通过示踪法可较精密地动态地研究向日葵各生育阶段各部位的吸肥动态规律,获得较真实准确的肥料利用率,并且能将植物中吸收的全氮和全磷分解成两部分,即把来自土壤和来自肥料的氮、磷区别开来,从而为向日葵施肥提供科学依据. Sunflower is still a new crop in our country, so there is not much information about the application of fertilizers.Through the tracer method, we can study the dynamic law of the absorption of each part of sunflower at different stages of growth dynamically and get more accurate and accurate fertilizer utilization rate Can absorb plant nitrogen and total phosphorus decomposed into two parts, that is, from the soil and fertilizer from the nitrogen and phosphorus to distinguish, so as to provide a scientific basis for the sunflower fertilizer.