バラのハイラック仕立て法における採花母枝の長さが切り花本数および形質に及ぼす影響(栽培管理・作型)  [in Japanese] Effect of Mother-stem Length on Cut Flower Stem Yield and Characteristic Form during the High-rack Training System for Rose Plants(Crop Production & Cropping Type)  [in Japanese]

バラのロックウール栽培において,ハイラック仕立て法における採花母枝の長さが切り花本数および切り花形質に及ぼす影響について'アサミ・レッド(ローテローゼ)'を用いて検討した.その結果,収穫開始から1年間の総切り花本数は,採花母枝長が0cmの場合には,採花母枝長が5および10cmの場合とほぼ同等であり,採花母枝長が15および20cmの場合にはそれらと比較して多かった.切り花長,切り花重および節数は,採花母枝長が0cmの場合に最も大きくなった.このため,採花母枝長が0cmの場合と比較して,採花母枝長が5〜20cmでは切り花の形質および量感は劣るが,実用上問題のない程度であった.以上の結果より,バラ'アサミ・レッド'のハイラック仕立て法において,切り花本数および切り花形質を総合的に考慮すると,採花母枝の長さは15〜20cmが適すると結論された.

The effect of mother-stem length on cut flower stem yield and characteristic form during the high-rack training system for rose plants 'Asami・Red' (syn. 'Rote Rose') was studied for five different mother-stem lengths, 0cm (control ; arching), 5cm, 10cm, 15cm and 20cm for a year. Three months after being planted on a high rockwool bench in September 1997, all scion stems and Rosa odorata Sweet rootstock stems were bent below the horizontal position. The yield of cut flowers was much higher in the 15cm and 20cm treatments than in the 0cm, 5cm and 10cm treatments. The characteristic form of the cut flowers, i.e., stem length, stem weight and weight/length ratio (g・cm^<-1>), after 0cm treatment was superior to those after treatments. However, the characteristics of cut flowers in the high-rack system was commercially acceptable and almost the same for each of the other four mother-stem lengths. These results suggest that mother-stem lengths of 15 to 20cm may be the most favourable for the high-rack training system of 'Asami・Red' rose plants.