培養液非更新水耕キュウリの接ぎ木による収穫期の延長

The effect of rootstocks in non-renewal solution culture of cucumber (Cucumis sativus L. cv. Shogoin-aonaga-fushinari), on sustaining yield in the late harvest period for autumn, spring, and summer crops was investigated. 1. Vegetative growth of 'Shogoin-aonaga-fushinari' plants at the end of the experiment was only slightly affected for the 3 seasons whether they were ungrafted or grafted on seedings of 'Shogoin-aonaga-fushinari', 'Hokushin' or 'Aodai'. There is no evidence that rootstocks influence vegetative growth. 2. The number of harvested fruit of 'Shogoin-aonaga-fushinari' in the summer crop was increased by grafting on the rootstock of 'Hokushin' or 'Aodai'. The weekly number of harvested fruit which decreased in the late harvest period on ungrafted plants was not observed on plants grafted on 'Hokushin' or 'Aodai' seedlings, thereby, extending the harvest season. Thus, the fruit yield in the closed nutrient flow system was sustained for a longer period by grafting 'Shogoin-aonaga-fushinari' on 'Hokushin' or 'Aodai' seedlings.