Effects of Pinching and Lowering on Cucumber Yield and Yield Components

Abstract

原 著 523 園学研．(Hort. Res. (Japan)) 11 (4) : 523–529．2012. 収量構成要素の解析からみたキュウリ短期栽培の摘心およびつる下ろし整枝法の差異 東出忠桐 1 *・後藤一郎 2 ・鈴木克己 1 ・安場健一郎 1 ・塚澤和憲 3 ・安 東赫 4 ・岩崎泰永 4 1 農研機構野菜茶業研究所 305-8666 茨城県つくば市観音台 2 カネコ種苗 371-0844 群馬県前橋市古市町 3 埼玉県農林総合研究センター園芸研究所 346-0037 埼玉県久喜市六万部 4 農研機構野菜茶業研究所 470-2351 愛知県知多郡武豊町南中根 Abstract The effects of pinching and lowering on cucumber yield and yield components were investigated. A short-term experiment was conducted on 3 cucumber (Cucumis sativus L.) cultivars grown hydroponically in a greenhouse from July to October 2011. Pinching plants were pinched at above 20 leaves on a main branch and at the 2nd leaf on the first lateral branches. Lowering plants were pinched at above 15–19 leaves on a main branch and not pinched on 4 lateral branches that were lowered with their growth. The fresh fruit yield of pinching plants in all cultivars was higher than in lowering plants. The high fresh fruit yield was caused by the high dry weight yield, and the high dry weight yield was caused by the high dry matter production and distribution of it to fruits. Total dry matter production was correlated with light interception at 40 days after transplanting, but was correlated with light use efficiency, i.e., dry matter production per intercepted light, during the entire experimental period.