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首页> 外文期刊>Plant and Soil >Remobilised nitrogen and root uptake of nitrate for spring leaf growth, flowers and developing fruits of pear (Pyrus communis L.) trees.
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Remobilised nitrogen and root uptake of nitrate for spring leaf growth, flowers and developing fruits of pear (Pyrus communis L.) trees.

机译：为梨树（Pyrus communis L.）的春季叶片生长，花朵和发育中的果实吸收的氮和根吸收态氮。

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摘要

One-year old pear cv. Abbe Fetel trees grafted on quince C rootstocks and grown in sand culture at the experimental farm of the University of Bologna, Italy, were given a generous supply of N fertilizer during the 1995 growing season, and were given1 g of labelled nitrate-N on each of 3 dates in spring 1996 (19 March (before bud burst), 11 and 29 April). Leaves, flowers and fruit were sampled on 5 dates between April 11 and May 13 and the recovery of labelled N used to distinguish the remobilization of N and the root uptake of nitrate. Remobilization of stored N accounted for most of the N present in leaves and flowers during blossoming. Remobilization of N ceased between petal fall and the beginning of fruit development. Root uptake of nitrate increased linearly over time and at the last sampling date, 55 days after bud burst, fertilizer N contributed approximately half of the total N recovered in both spur and shoot leaves, the remainder coming from remobilization. Flowers and fruits based their N metabolism more on remobilization than did leaves. This pattern of internal cycling of N is discussed in relation to fertilizer application strategies for pear trees.
机译：一岁的梨简历。在意大利博洛尼亚大学的实验农场上，将木薯C砧木上嫁接的阿贝·费特尔树木种植于沙土中，并在1995年的生长季期间为其提供了充足的氮肥，并且每棵树上都添加了1克标记的硝酸盐-N 1996年春季（3月19日（芽破裂前），4月11日和29日）的3个日期。在4月11日至5月13日期间的5个日期对叶子，花朵和果实进行了采样，回收的标记N用于区分N的迁移和硝酸盐的根吸收。在开花期间，储存的氮的迁移占叶和花中氮的大部分。在花瓣落下和果实发育开始之间，N的转运停止了。硝酸盐的根吸收量随时间线性增加，在最后一个采样日期，即芽破裂后第55天，肥料N贡献了正叶和枝叶中回收的全部N中的一半，其余来自于动员。花和果实的氮代谢比叶片更多地依赖于迁移。讨论了氮的内部循环模式与梨树施肥策略的关系。

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