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Exponential fertilization on red-seed tree (Ormosia hosiei) seedlings subjected to contrasting light conditions: Do we really need intensive nutrient loading?

Authors :
Xiuli CHU
Xianyou LUO
Zhichun ZHOU
Source :
Notulae Botanicae Horti Agrobotanici Cluj-Napoca, Vol 49, Iss 2 (2021)
Publication Year :
2021
Publisher :
AcademicPres, 2021.

Abstract

Exponential fertilization (EF) can feed seedlings with more nutrients than needed for growth and continuous lighting is expected to reduce the risk of loading at high application rate. In this study, red-seed tree (Ormosia hosiei Hemsley & E. H. Wilson) seedlings were raised by EF at a low rate of 160 mg nitrogen (N) plant-1 (conventional) (N-phosphorus [P]-potassium [K], 12-9-12) and a high rate of 600 mg N plant-1 (intensive), which was adapted from previous studies with large-pot-seedlings. Both fertilizer regimes were nested to either of two light spectra from high-pressure sodium (HPS) and light-emitting diode (LED) sources with three replicates for each combined treatment. Seedlings subjected to the conventional regime in the LED spectrum showed better growth and greater biomass accumulation with higher leaf N and P contents than other ones. In the conventional fertilizer regime, the LED spectrum also resulted in higher photosynthesis shown by more pigments and higher N synthesis than the HPS spectrum. The HPS spectrum strengthened P synthesis in the intensive regime. The antioxidative activity was stimulated by a high dose of EF, hence excessive toxicity was likely induced. We recommend using the normal rate of 160 mg N plant-1 for the culture of red-seed tree seedlings with LED lighting to promote seedling quality without causing excessive nutrient toxicity.

Details

Language :
English
ISSN :
0255965X and 18424309
Volume :
49
Issue :
2
Database :
Directory of Open Access Journals
Journal :
Notulae Botanicae Horti Agrobotanici Cluj-Napoca
Publication Type :
Academic Journal
Accession number :
edsdoj.10f9bc1498041c2b4de9c0b8535abe2
Document Type :
article
Full Text :
https://doi.org/10.15835/nbha49212244