夏秋ギクの露地栽培におけるエセフォン散布と挿し穂冷蔵が生育と開花に及ぼす影響(栽培管理・作型)  [in Japanese] Effects of Ethephon Applications and Cold Storage of Cuttings on Growth and Flowering of Summer-to-Autumn-Flowering Chrysanthemums under Open Field Conditions (Crop Production & Cropping Type)  [in Japanese]

夏秋ギク系大輪ギクの80cm以上の切り花を9月に露地圃場で採花するため,エセフォン散布と挿し穂冷蔵を組み合わせ,その伸長生長効果を電照と比較し,平野部と準高冷地で生育を検討した.供試した品種における切り花長伸長の効果はエセフォン散布,電照および挿し穂冷蔵の組み合わせにより付加的に増加した.平野部における'サマーイエロー'の開花日は,挿し穂冷蔵30日とエセフォン散布4回区が9月19日,切り花長は90.9cmであった.挿し穂冷蔵45日とエセフォン散布による開花遅延と切り花長の伸長効果は,準高冷地が平野部と比べて高かった.準高吟地の'サマーイエロー'の挿し穂冷蔵45日とエセフォン散布4回区で,開花日が9月28日,切り花長が80.1cmであった.以上より,夏秋ギクの80cmを越える切り花をエセフォン散布と押し穂冷蔵により,9月下旬に露地で採花できた.

The effects of multiple sprayings of ethephon and cold storage of cuttings on stem length and flowering of summer-to-autumn-flowering large-flowered chrysanthemum (Dendranthema grandiflorum (Ramat.) Kitamura), were studied to obtain cut flowers with 80 cm stem length in September under open field conditions in both lowland and highland environments. In both cultivars, a combination of ethephon sprays, lighting and cold storage of cuttings had an additive effect on stem length. In 'Summer-yellow', flowering was inhibited by four applications of ethephon spray and 30-day cold storage of cuttings on 19th September and the stem length was 90.9 cm in the lowlands. In the highlands, stems of 'Seiun' and 'Summer-yellow' were longer than in the lowlands when 45-day cold storage of cuttings and ethephon sprays were used. In 'Summer-yellow', flowering was inhibited by four applications of ethephon spray and 45-day cold storage of cuttings on 28th September. The stem length was 80.1 cm in the highlands. It is possible to harvest high quality flowers of summer-to-autumn-flowering chrysanthemum with stem lengths of more than 80cm in late September after ethephon applications and cold storage of cuttings under open field conditions.