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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 Ámol 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 Ámol 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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