花芽着き挿し穂を利用したポットマム生産(栽培管理・作型)  [in Japanese] Production of Pot-mum Using Cuttings Differentiating Flower Buds (Crop Production & Cropping Type)  [in Japanese]

ポットマムの効率的な小鉢生産を目的として,花芽が分化した枝を押し穂に用いる「花芽押し」栽培について検討した.「花芽押し」の適期は,親株に対する短日処理を開始して2週間程度経過し,頂花の花芽が小花形成期に達した時期であった.実験に用いたスプレータイプのキクおよび一輪ギクともに,「花芽押し」栽培によって栽培期間が大幅に短縮され,開花時にはコンパクトな草姿の植物が得られた.スプレータイプのキクの場合,「花芽押し」栽培により着花数がやや減少したが,その中では多花性のイソギク交配種は着花数減少の程度が少なく,「花芽押し」栽培により適すると考えられた.

Cuttings differentiaing flower buds were rooted and grown in six cm pots under short-day conditions to reduce the size of pot-mum and save labor. The optimal time for cutting was about two weeks after the start of short-day treatment when the flower buds developed to the stage of floret formation. The period of cultivation and the height of spray and standard-type pot-mum were extremely reduced using cuttings differentiating flower buds compared with the ordinary culture method of pot-mum in which vegetative cuttings were rooted under long-day condition. This new culture method decreased the number of flowers on spray-type chrysanlhemums (Dendranthema grandiflorum ). However, it had little influence on the number of flowers on some interspecific hybrids between D. grandiflorum and D. pacificum.