Nogal, Juglans neotropica Diels is an endangered woody angiosperm of tropical origin. Several trees of this species have been planted in Bogotá City, Colombia. The field of study is urban tree phenology. The research question of the current work is when do phenological changes occur throughout the year in urban nogal trees in the northern portion of Bogotá, Colombia? The main research objective was to characterize the phenological changes of nogal according to the German (Biologische Bundesanstalt, Bundessortenamt und CHemische Industrie) scale. The study area was located between 137 to 152 streets and along a major avenue on the northern portion of Bogotá. Selected sites and tree sampling criteria were based on tree density (number of trees per site), tree height (three to seven meters in height), healthy individuals, and phenological stage. We selected a total of 19 trees. Vegetative flushes, flowering, fruiting, and leaf abscission occur once yearly. Nogal is a deciduous tree species that abscises its leaves on portions of the canopy and initiates new vegetative flushes at the same time. Nogal is protandrous, bearing both catkins and pistillate flowers. The scale can be used for in situ conservation of the species as a non-destructive, and consistent tool to manage nogal populations. BBCH also can be used to monitor the phenological stages of nogal and for future research studies within the city and elsewhere. We observed birds such as Thurdus fuscater, Zonotrichia capensis and Zenaida spp perching on the branches of this tree. The city is an important sanctuary for nogal conservation. The BBCH scale is an effective and non-destructive tool to monitor the precise timing of phenological events.

诺加尔（Nogal，Juglans neotropica）狄尔斯是热带起源的濒危木质被子植物。哥伦比亚的波哥大市已经种了几棵这种树。研究领域是城市树木物候学。当前工作的研究问题是，哥伦比亚波哥大北部城市的名贵树全年何时发生物候变化？主要的研究目标是根据德国（生物医学联合会，德国工业联合会和化学工业）量表来表征诺格的物候变化。研究区域位于137至152条街道之间，并位于波哥大北部的主要大道上。选择的地点和树木抽样标准基于树木密度（每个地点的树木数量），树木高度（三至七米高），健康个体和物候期。我们总共选择了19棵树。植物性潮红，开花，结果和叶片脱落每年发生一次。Nogal是一种落叶树种，在其冠层的一部分上脱落其叶子，并同时引发新的植物性潮红。诺加尔（Nogal）是常生动物，有柔cat花和雌蕊花。该量表可作为非破坏性一致的工具来管理物种的原地保护物种。BBCH还可以用于监控诺格语的物候阶段，以及用于城市和其他地方的未来研究。我们观察到诸如 既有柔cat花和雌蕊花。该量表可作为非破坏性一致的工具来管理物种的原地保护物种。BBCH还可以用于监控诺格语的物候阶段，以及用于城市和其他地方的未来研究。我们观察到像 既有柔cat花和雌蕊花。该量表可作为非破坏性一致的工具来管理物种的原地保护物种。BBCH还可以用于监控诺格语的物候阶段，以及用于城市和其他地方的未来研究。我们观察到诸如Thurdus fuscater，Capo Zonotrichia capensis和Zenaida spp 栖息在这棵树的树枝上。这个城市是重要的高贵保护区。BBCH量表是一种有效且非破坏性的工具，可用于监控物候事件的准确计时。