福岡県農業総合試験場研究報告

親株のロックウール耕によるキク苗生産
第２報　挿し穂収量増加のための親株管理法

［摘要］秋ギク‘秀芳の力’を用いてキク親株をロックウール耕で養成した場合のロックウールマットの被覆資材、定植苗の発根期間および採穂節位が採穂数に及ぼす影響について検討した。ロックウールマットの被覆資材として不織布を使用すると、白黒フィルム被覆の1.2倍、無被覆の1.1倍の採穂数が得られた。未発根の挿し穂をロックウールマットに直接挿しとすると、発根苗を定植した場合と比較して、初期生育は劣ったものの８月の採穂数が多くなり、総採穂数は多くなった。側枝の下４節を残して採穂すると、採穂数は最も多くなり、３節残しの約1.2倍、２節残しの約1.7倍の採穂数が得られた。

［キーワード：キク、親株、ロックウール耕、採穂数、被覆資材、発根期間、採穂節位］

　Cutting Production from Mother Stocks in Chrysanthemums Grown in Rockwool. II. Mother Stocks Management for Increasing Yield of Cuttings. KUNITAKE Toshihiro, Takahiro TANIGAWA and Hiroshi MATUSUI. (Fukuoka Agric. Res. Cent., Chikushino, Fukuoka 818-8549, Japan) Bull. Fukuoka Agric. Res. Cent..19: 60 ～ 63 (2000)

　The yield of cuttings of the autumn flowering cultivar 'Syuhonochikara' whose mother stocks were grown in rockwool were examined. Influences of rockwool mat cover materials and rooting period were also investigated.

　In the case of using non-woven fabric for rock-wool mat cover, the number of the cuttings increased by as much as 1.2 and 1.1 times compared to using polyethylene sheets for cover and cover-less rockwool mat.

　The shoot growth of unrooted cuttings in direct planting was less active in number than those planted after the cuttings were rooted in the early stage, whereas, the cutting yields from direct planting of unrooted cuttings significantly increased in August along with the number of the total cuttings, compared to those planted after rooting in rockwool culture.

　When cut at the fourth node, the number of cuttings increased by as much as 1.2 and 1.7 times compared to those cut at the second or third node. Consequently, the number of the cuttings were maximal when the cuttings were done at the fourth

[Key words: chrysanthemum, mother stocks, rockwool culture, yield of cuttings, cover materials,　rooting period, node-order for cuttings]