NFTにおけるネギの生育に及ぼす栽植密度の影響(発育制御)  [in Japanese] Effects of Planting Density on the Growth of Welsh Onion Grown in NFT(Growth Regulation)  [in Japanese]

NFTにおける小ネギの生産安定と品質向上の基礎的知見を得るため,栽植密度がネギの生育に及ぼす影響について調査した.植え穴数が36,68,84,116穴のパネル(縦99×横31×厚さ2cm)を用い,一穴に3植物体のネギを植えて14週間栽培した.その結果,栽植密度が高くなるにつれて葉しょうは有意に細くなり,116穴区では最も細くなった.個体当たりの地上部および地下部の重量は,栽植密度が高くなるにつれて小さくなる傾向を示した.しかし,単位面積当たりの収量は栽植密度が高くなるほど増加する傾向を示し,116穴区(1134個体/m^2)では4.3kgと最も多くなった.以上の結果,NFTにおける冬期の小ネギ栽培においては,葉しょう径と収量の観点から,パネルあたり116穴,すなわち1m^2当たりの植穴数を380程度にすることが適切であると考えられた.

The effects of planting density on the growth of Welsh onion in NFT (Nutrient Film Technique), were investigated to obtain basic knowledge to promote stable production and improve its quality. Welsh onion was grown for 14 weeks on a panel (99 × 31 × 2 cm)with different numbers of planting holes (36, 68, 84 or 116 holes per panel). Three plants were planted per hole. The leaf sheath became significantly thinner at higher planting densities. The thinnest diameter of leaf sheath 5.9 mm was attained, when a panel with 116 holes was used. The shoot and root weight per plant tended to decrease at higher planting densities. However, the yield per one square meter tended to increase at higher planting densities and the yield amounted to 4.3 kg on panel with 116 holes. It was considered from a suitable diameter of leaf sheath and yield that Welsh onion grown as a condiment is suitable for growing hydroponically on a panel with 116 holes (380 holes per square meter; 1134 plants per square meter).