福岡県農業総合試験場研究報告25 (2006) pp 29 - 32
促成ナスの点滴かん水施肥（養液土耕）栽培が
土壌の物理性および根の形態に及ぼす影響
満田幸恵＊・荒木雅登・山本富三
本研究では，促成ナスの点滴かん水施肥（養液土耕）栽培が土壌の物理性および根の形態に及ぼす影響について検討を行った。
1．点滴かん水施肥栽培では慣行栽培に比べ，高い収量が得られた。
2．栽培終了時の土壌は，点滴かん水施肥栽培の方が慣行栽培に比べ膨軟であることが認められた。これは点滴チューブを用いて少量多頻度で水分を供給したためと考えられた。
3．根重は点滴かん水施肥栽培と慣行栽培とで同等であったが，根長は点滴かん水施肥栽培の方が長かった。これは土壌が膨軟であったため，細い根を伸長できたことに起因すると推察された。
〔キーワード：物理性，かん水施肥，ナス，根，養液土耕〕
Effects of Drip Fertigation on Physical Property of Soil and Root System of Eggplant under Forcing Culture
MIZDA Yukie, Masato ARAKI and Tomizou YAMAMOTO
(Fukuoka Agricultural Research Center, Chikushino, Fukuoka 8188549, Japan) Bull. Fukuoka Agric. Res. Cent. 25:29-32 (2006)
Effects of drip fertigation on physical property of soil and root system of eggplant (scion: Solanum melongena L. , rootstock: Solanum torvum ) under forcing culture were investigated.
1. The yield of eggplant cultured under the drip fertigation way was higher than that cultured under the customary way.
2. As for physical property of soil, values of the hard index and corn index of soil were lower under the drip fertigation way than those under the customary way. This indicates often and little irrigation with drip tube maintained the soil structure in good condition.
3. The weight of root cultured under the drip fertigation way and that cultured under the customary way were almost equal. But the length of root cultured with drip tube was longer than that cultured under the customary way. The fact suggests that softer soil leaded slimmer root and large yield.
[Key word: drip-fertigation, eggplant, hardness, physical property, root, soil]