キュウリのハウス抑制栽培における尻太り果の発生を低減する栽培方法について(栽培管理・作型)  [in Japanese] Culture Methods to Reduce the Occurrence of the Bottle-gourd-shaped Fruits in the Greenhouse of Fall-cropped Cucumber Plants(Crop Production & Cropping Type)  [in Japanese]

ハウス内の作業環境の改善を図ることを目的として,午前中の気温と湿度を25℃・40%前後で栽培すると,生育後半の低温期に尻太り果が発生する.その尻太り果の発生を低減する栽培管理について検討した.その結果,果実収穫後に下位節の側枝を基部より除去して畦面への受光条件を改善することで地温が上昇し,尻太り果の発生率が減少した.しかし,下位節から発生する側枝の減少によって1株当たりの収穫本数は減少したが,中位節の第2次側枝を第2節で摘心して着果節数を確保することで収穫本数の減少を防ぐことができた.また,0.1%硫酸カリウム水溶液を株元に灌注処理することで尻太り果の発生が減少し,上物率が向上することが分かった.

When cucumber plants are grown in a greenhouse kept at 25℃ with 40% RH in the forenoon to improve working environment, the occurrence of bottle-gourd-shaped fruits increased. We tried some cultural management practices to decrease the occurrence of such fruits. As a result, removing several first lateral branches after their cucumber fruits were harvested reduced the proportion of bottle-gourd-shaped fruits induced by rising soil temperature. Pinching the alternate lateral branches of the 11, 13 and 15th node on the main stem improved the number of fruiting nodes and prevented a decrease in the number of harvested fruits. Treatment with 0.1% potassium sulfate solution also decreased the proportion of bottle-gourd-shaped fruits, and increased the proportion of marketable cucumbers.