イチゴ親株用高設栽培装置の改良と２段階増殖による効率的苗生産

藤田幸一・三井寿一・末吉孝行¹⁾・伏原肇^２）
（園芸研究所）

［摘要］イチゴ親株の高設栽培における給液管理の省力化を図るため，不織布を用いて補完的に底面給液を行うことができるよう栽培装置の改良を行うとともに，改良した栽培装置を用いた２段階増殖法による効率的な苗の生産技術を開発した。
　高設栽培装置の改良は，イチゴの高設栽培用合成樹脂製栽培槽（ダブルベリーラックコンテナ）を用い，点滴型のかん水チューブで給液するとともに栽培槽底部に培養液を溜める湛液部を設け，溜まった培養液を不織布製揚水シートで親株の根部に補完的に給液するよう改良した。
　２段階増殖法は，10月中旬に 2℃で 1カ月間冷蔵処理した株を，改良した高設栽培装置に定植し， 1月に発生したランナーの子苗を，発根後， 1月下旬に再度高設栽培装置に定植し， 6月中旬に苗を採取する方法である。
　２段階増殖により，10月に定植した親株 1株から 6月中旬に約 250株の苗を生産することができ，従来の高設採苗と比べて親株数を約 6分の 1に節減できる。

［キーワード：イチゴ、とよのか、親株、高設栽培、採苗］

　Improvement of High Bench Culture System for Mother Plant of Strawberries and Development of Efficient Two-Step Multiplying Runner Plants. FUJITA Koichi, Hisakazu MITHUI, Takayuki SUEYOSHI, Hajime FUSHIHARA (Fukuoka Agricultural Recearch Center, Chikushino Fukuoka 818-8549, Japan) Bull. Fukuoka Agric. Res. Cent. 21 : 20 - 24 (2002)

　For laborsaving in control of irrigation on the high bench culture system for the mother plants of strawberries, the culture system was improved so that the system is supplementally subirrigated with the use of non-woven fabric. More efficient two-step multipication of runner plants was realised with this system.

　This improved version of the high bench culture system makes use of a culture container made of synthetic resin (trade name ‘DABURU-BERII-RAKKU-KONTENA').The culture solution is fed by way of drip irrigation tubes in the upper bottom of the container.

　Also, surplus culture solution is received by the lower bottom of the container and the pooled solution is supplementally subirrigated with fiber or siphoned to the roots of the mother plants by way of non-woven fabric.

　In the two-step multipication system the first mother plants are given cold storage treatment at 2℃ for a month and them planted in the improved system in the middle of October. Runner plants start growing in about January and, after rooting, they are planted as second mother plants in late January. These last runner plants are nursed again until mid-June and used as nursery plants.

　This method makes it possible to multiply to about 250 runner plants from January to the middle of June from a single mother plant. Therefore the number of mother plants can be decreased to one-sixth the amount of the usual culture.

[Key words : strawberry,‘TOYONOKA', mother plant, high bench culture, runner plant production]