ロックウール栽培におけるイチゴの生長，収量と果実品質に及ぼすＣＯ２施用の影響

Abstract

This experiment was carried out to investigate the effects of CO2 enrichment on growth, yield and fruit quality of strawberry (Fragaria×ananassa Duch. cv. Ai-Berry) grown with two types of rockwool (RW : slub and granule) . The growth and development of plants were hastened in flowering date, maturing days and harvesting date by CO2 enrichment in both RW media. Between the RW media, the growth was more vigorous and yield was higher in granule compared to those in slub. CO2 enrichment increased total yield by 50 and 30% in RW slub and granule, respectively. Soluble solid content and titratable acidity of fruits were also increased by the CO2 enrichment. Although the leaf area of plants grown with CO2 enrichment was larger compared to the control, the rate of water absorption was almost equal. The electric conductivity of nutrient solution was also markedly decreased by CO2 enrichment. In midwinter, the CO2 concentration in the control greenhouse was lower than outside especially on fine and cold days, and much lower than those in the usual soil cultured greenhouses. Because in greenhouses for soilless culture where no organic substance is applied, only a small amount of CO2 can be expected to be supplied from the soil, CO2 enrichment may be necessary when strawberry plants are grown without soil.