宿根スイートピーの長日下における開花および切り花品質に及ぼす播種時期の影響(栽培管理・作型)  [in Japanese] Effects of Sowing Time on Flowering and Cut-Flower Quality of Lathyrus latifolius L. under Long Day Conditions(Crop Production & Cropping Type)  [in Japanese]

宿根スイートピー(Lathyrus latifolius L.)の'ピンクパールを1〜7月に順次播種し育ててきた苗を8月20日に一斉に定植,整枝した後,同時に長日処理(16時間日長)を開始し,最低気温5℃の温度条件下で栽培して,年内開花の可能性を検討した.その結果,いずれの播種時期の苗でも年内に開花がみられ,3月以前の播種時期のものでは,定植当年内に株当たり3本前後の切り花を得ることができた.さらに,早く播種したものほど開花が早くなり,花柄がより長く,花序当たりの花数もより多くなることが分かった.また,播種時期が異なる苗の間で1番花の着花節位に差がみられなかった.

Seeds of Lathyrus latifolius L. 'Pink Pearl' were sown monthly between 10 January and 10 July and raised in a greenhouse maintained at 15-25℃. Seedlings were planted on 20 August in a bed in a greenhouse and their old shoots were cut back 2 weeks after planting leaving 2 new shoots to grow. The plants were grown under long day conditions of 16 hours day length and temperature above 5℃. Those sown before March produced about 3 flower stalks starting in mid- November and continuing to year- end. Flowering was advanced and longer flower stems with more florets per inflorescence were obtained from seeds sown earlier. However, there were no differences in the number of nodes to first flower.