氮素水平对甜菜主要营养的影响

甜菜植株含氮量与施氮量呈极显著正相关，生育中前期氮的分配以叶部为主，其后氮向根的分配率增加，但高氮处理到生育后期氮对叶部的分配率仍处于较高水平，不利于产量形成和糖分积累。甜菜植株磷、钾含量与施氮量呈极显著正相关，氮与磷、钾表现出明显的互作效应。

The Affection of Nitrogen Amount to Main Nutrient in the Sugar Beet Plant

There is a significantly positive correlation between the nitrogen amount in sugar beet plants and ap-plied nitrogen fertilizer. Nitrogen maily distributes in the leaves at the beginning of its growth period. Lat-er, the nitrogen distributive rate increases in sugar beet roots, but it is still higher in the leaves when more nitrogen is used than less. It is not good for sugar beet yield formation and sucrose accumulation. There is a significantly positive correlation among the phosphrus and potassium amounts in sugar beet plant and the applied nitrogen . It is a apparent complementary effectivity applied the nitrogen, phophrus and potassium.