论文部分内容阅读
用金冠和红星苹果成年树,于1982和1983年10月下旬～11月上旬,在短果枝叶片施用~(15)N-尿素,75％进入树体。短果枝木质部和皮部N含量增高,在总N量中来自~(15)N尿素的百分率分别为5.74～12.7％和8.24～11.9％。第二年大蕾期在花、叶和新梢中均有~(15)N-尿素N出现,分别可占总N量的1.51～1.87％和1.46～1.88％。在二年生木质部和皮部内仍保留有相当量的~(15)N-尿素N。秋季经由短果枝运出的~(15)N,在春天有一部分又回到短果枝中来。由短果枝进入树体的~(15)N,也可向引入区上下附近的短果枝内运转。秋季叶面施用尿素的短果枝,花的含N百分率高于对照,但受树整体调节的影响,短果枝总含N量的百分率未见增高。在幼果期仍可测得~(15)N在果中的分配。本文还讨论了该方法的可行性及生产上的意义。
Adult trees of Golden Delicious and Red Star apple were used. From late October to early November, 1982 and the early November, 15 ~ N-urea was applied to short-leaf branches and 75% of them entered the tree. The content of N in the xylem and scalp of short fruit branches increased from 5.74% to 12.7% and 8.24% to 11.9% in the total amount of N, respectively. The second year of large buds in the flowers, leaves and shoots have ~ (15) N-urea N appear, respectively, the total N content of 1.51 to 1.87% and 1.46 to 1.88%. In the two-year-old xylem and skin still retains a considerable amount of ~ (15) N- urea N. In autumn, ~ (15) N transported by short fruit branches returned to short fruit branches in spring. ~ (15) N which enters the tree body from short fruit branches may also be run to the short fruit branches near the upper and lower sides of the lead-in area. The percentages of N contained in short-branch branches and flowers in autumn foliar application were higher than those in the control. However, the percentage of total N content in short branch branches did not increase due to the overall regulation of trees. Distribution of ~ (15) N in fruit can still be measured in young fruit. This article also discusses the feasibility of the method and its production significance.