Over - fertilization is one of the most relevant issues affecting container-grown nursery plants.

The massive application of chemicals results in severe pollution due to nitrogen (N) leaching, and leads to the production of unhealthy plants sensitive to fungal diseases and insect attacks that increase the use of pesticides. The ability of two fluorescence-based sensors (Dualex and Multiplex) for assessing the N-sufficiency of container grown Prunus laurocerasus L. and Ligustrum japonicum L. as test plants was investigated in a two-year long experiment under experimental and commercial growing conditions. An optimal N rate of 450 mg L⁻¹ was identified for both species growing under different N fertilization levels (0 - 1350 mg N L⁻¹). Fluorescence-based indices allowed for reliable estimation of both chlorophyll and nitrogen content at the leaf and canopy level. Absolute and relative sufficiency threshold values were provided and spatially compared under standard nursery conditions. The optimal shoot N concentration of 2.04% (P. laurocerasus) and 1.35% (L. japonicum), and the corresponding non-destructive nitrogen balance index (NBI) values were assessed and used for decision-making on N application and monitoring of the species considered.

过度施肥是影响容器种植苗圃植物的最相关问题之一。

由于氮 (N) 浸出，化学品的大量使用导致严重污染，并导致对真菌病害和昆虫侵袭敏感的不健康植物的产生，从而增加了杀虫剂的使用。在实验和商业生长条件下进行了为期两年的实验，研究了两种基于荧光的传感器（Dualex 和 Multiplex）用于评估容器种植的Prunus laurocerasus L. 和Ligustrum japonicum L. 作为测试植物的氮充足的能力。的450毫克的L的最佳N值^-1被确定为两个种类在不同氮肥级别（0生长- 1350毫克NL ^-1）。基于荧光的指数可以可靠地估计叶片和冠层水平的叶绿素和氮含量。提供了绝对和相对充足阈值，并在标准苗圃条件下进行了空间比较。评估了2.04%（P. laurocerasus）和1.35%（L. japonicum）的最佳芽氮浓度，以及相应的非破坏性氮平衡指数（NBI）值，用于施氮决策和监测考虑的物种。