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以~(15)N标记的硫酸銨作示踪剂,研究了田间栽植的苹果幼树对春、夏、秋和分期施用氮肥的吸收利用规律。春季吸收的~(15)N数量很少,但进入体內者能迅速运送到地上部新生器官,根内存留很少,初夏所施~(15)N能在短期內被根系大量吸收,并较均衡地分配于多数器官;秋施~(15)N处理一个月后树体内~(15)N含量较春施者高,且此时吸收的~(15)N主要贮于根和主干中。春、夏施增加~(15)N贮备水平的作用较小,秋施能显著提高贮藏~(15)N含量,且于翌春能最大限度地把贮藏~(15)N调运到新生器官;分期施氮不仅影响当年的生长发育,还显著提高了贮藏~(15)N水平。
Ammonium sulfate marked with ~ (15) N was used as a tracer to study the law of absorption and utilization of nitrogen fertilizer applied in spring, summer, autumn and stages in young apple trees planted in field. The amount of ~ (15) N absorbed in spring was very little, but it could be quickly transported to shoots of aerial parts of newborn organs with little remaining in root. In the early summer, ~ (15) N could be absorbed by the roots in a short period and The distribution of ~ (15) N in the leaves was higher than that in the spring, and the amount of ~ (15) N absorbed at this time was mainly stored in the roots and trunk . The effect of increasing the amount of ~ (15) N reserve in spring and summer was small, and autumn application could significantly increase the content of ~ (15) N in storage, and could transfer the storage of ~ (15) N to the new organs to the maximum extent in next spring. Staging nitrogen application not only affected the growth and development of the year but also significantly increased the level of ~ (15) N storage.