福岡県農業総合試験場24 (2005) ｐｐ59−62
ファレノプシスの鉢物生産における生育ステージごとの炭酸ガス施用効果
國武利浩※・谷川孝弘・黒柳直彦
（花き部）
ファレノプシスの鉢物生産における生育ステージごとの炭酸ガス施用効果を明らかとするために以下の試験を行った。
１）ファレノプシスの栄養生長中期（ 160日間：昼温30℃，夜温25℃）に炭酸ガス（17:00〜8:00のCO２濃度1,000ppm）を施用することで生育を促進させることができないかについて調査した。その結果，炭酸ガス施用により無施用に比べて，根重が増加する傾向を示した。しかし，葉数，葉面積の推移に差はなかった。
２）花成誘導直前の栄養生長後期（34日間：昼温35℃，夜温25℃）と花成誘導期（ 131日間：昼温25℃，夜温20℃）及びその組合せによる炭酸ガス施用が開花株率と小花数などの品質に及ぼす影響について調査した。その結果，栄養生長後期のみに，炭酸ガスを施用しても，無施用と差がなく効果がなかった。一方，花成誘導期のみに炭酸ガスを施用した場合は，開花株率が向上した。さらに，栄養生長後期と花成誘導期ともに炭酸ガスを施用した場合，開花株率は高くなり，小花数が多くなるなど品質が向上した他，開花までの所要日数が短くなった。
［キ−ワ−ド：ファレノプシス，炭酸ガス施用，開花株率，品質向上］
Effect of Carbon Dioxide Enrichment on Each Growth Stage in Pot Plant Production of Phalaenopsis
KUNITAKE Toshihiro, Takahiro TANIGAWA, and Naohiko KUROYANAGI.(Fukuoka Agricultural Research Center, Chikushino, Fukuoka 818-8549, Japan) Bull.
Fukuoka Agric.Res. Cent. 24:59-62(2005)
This investigation was carried out to clarify the effect of carbon dioxide enrichment on each growth stage in pot plant production of phalaenopsis.
1) The facilitative growth effect of carbon dioxide enrichment CO2 concentration at 1,000ppm from 17:00 to 8:00 was investigated in the middle vegetative growth stage of phalaenopsis. During the remaining time, the plants were exposed to an ambient atmosphere. Over the 160 days of the experiment, a controlled day temperature of 30℃ and night temperature of 25℃ were applied. The results indicated that the root weight of carbon dioxide-treated plants was heavier than that of the control group. But, there was no difference in the number of leaves and leaf area.
2) The influence of carbon dioxide enrichment was investigated under 3 conditions; (1) the later vegetative growth stage to just before the flower induction stage for 34 days at a day temperature of 35℃ and night temperature of 25℃; (2) the flower induction stage for 131 days at a day temperature of 25℃ and night temperature of 20℃; and (3) a combination of (1) and (2) on such qualities as flowering stock rates and the number of florets. The results show that for application of enriched carbon dioxide only in the latter vegetative growth stage, there was no merit compared with plants exposed in the ambient atmosphere. On the other hand, flowering stock rates improved when the enriched carbon dioxide was applied only in the flower induction stage.
Furthermore, when enriched carbon dioxide was applied to both the latter vegetative growth stage and the flower induction stage, flowering stock rates improved, and the number of florets
increased with improved flower quality. Also, the plants flowered in a fewer number of days.
[Key Words:phalaenopsis, carbon dioxide enrichment, flowering stock rate, quality improvement]
