電熱線によるネギの側条地中加温が抽苔および生育に及ぼす影響(発育制御)  [in Japanese] Effect of Soil Warming by Electrically Heated Wire on Bolting and Growth in Welsh Onion (Allium fistulosum L.)(Growth Regulation)  [in Japanese]

ネギの側条に電熱線(約20℃)を埋設し地中加温する方法(側条地中加温)が抽苔および生育に及ぼす影響について調査した.地中加温区は無処理区の2倍の出葉速度を示した.地中加温区におげるネギの地上部および地下部の乾物重は有意に増加した.一方,草丈および葉長には地中加温の影響が認められなかった.無処理区の抽苔率は約10から30%であったのに対し,地中加温区ではほとんど認められなかった.以上の結果,電熱線によるネギの側条地中加温は,初夏どりネギ栽培における抽苔抑制および生育促進に有効であることが示された.

Effect of soil warming by electrically heated wire (about 20℃) on bolting and growth in Welsh onion (Allium fistulosum L.) was investigated. Soil warming promoted the rate of leaf emergence to twice the control value. Soil warming increased dry weight of both above and under-ground parts, but did not influence the plant height or leaf length. Reduced bolting rate due to soil warming was observed. It was shown that soil warming using a heated wire was an effective treatment to suppress bolting and promote growth in Welsh onions harvested in early summer.