Effects of CO2 enrichment and 5-aminolevulinic acid-based fertilizer application on cut flower yield of Alstroemeria in low light conditions during winter

ISHS Acta Horticulturae 1312: III Asian Horticultural Congress - AHC2020

**Effects of CO₂ enrichment and 5-aminolevulinic acid-based fertilizer application on cut flower yield of Alstroemeria in low light conditions during winter**

Authors:	S. Mori, Y. Kaji, R. Degai
Keywords:	chlorophyll, cultural practice, environmental control, greenhouse, perennial
DOI:	10.17660/ActaHortic.2021.1312.37
Abstract: The effects of CO₂ enrichment and 5-aminolevulinic acid (ALA)-based fertilizer application on cut flower production of Alstroemeria 'Avalange' were investigated. Seedlings were potted in 45-cm diameter polyethylene pots in September 2017. Four treatments were applied: general liquid fertilizer applied regularly (control group); ALA-based fertilizer (ALA group); CO₂ enrichment (CO₂ group); and ALA-based fertilizer combined with CO₂ enrichment (ALA+CO₂ group). In the first year, the experiment was conducted in a greenhouse until April 2018 and the CO₂ concentration in the CO₂ and ALA+CO₂ groups was increased to a maximum of 800 µmol mol^‑1 for 5 h of the light period. The number of cut flowers and the SPAD value of leaves in the ALA+CO₂ group were significantly higher than those in the control group. There were no significant differences in cut flower length, cut flower weight, stem diameter, the number of peduncles and the number of florets among the treatments. In the second year, the experiment was conducted in a phytotron from November, 2018 to March, 2019 and the CO₂ concentration in the CO₂ and ALA+CO₂ groups was increased to 900 µmol mol^‑1 for 7 h. The number of cut flowers in the ALA+CO₂ group was significantly higher than those in the control and CO₂ groups. Stem diameter in the ALA, CO₂ and ALA+CO₂ groups was thicker than that of the control group. There were no significant differences in cut flower length, cut flower weight, the number of peduncles and the number of florets among the treatments. The number of shoots in the CO₂ group was significantly greater than those in the control and ALA groups. These findings demonstrate that ALA-based fertilizer application under CO₂ enrichment conditions increases Alstroemeria cut flower numbers in low light conditions during winter.
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