抄録
The effects of CO2 enrichment (700-900 ppm in the day time) and planting density on yield, fruit quality and water and mineral uptake by plants were investigated with strawberry (Fragaria × ananassa Duch. cv. Nyoho) grown in peat bag culture (width : 30 cm, length : 80 cm, media : 18 L) . Under CO2 enriched condition, total amount of uptake in each mineral increased with vigorous plant growth and increase in yield. Therefore, concentration of minerals and EC in drainage were quite low and only 3-10, 10 and 7-12% of supplied N, P and K were wasted with drainage, respectively. Total yield per plant increased by 50 to 70% with CO2 enrichment. Yield per peat bag (equal to area basis) increased with increasing planting density under CO2 enriched condition, however, that in control (200-400 ppm in the day time) increased little with increase in planting density. Average fruit weight and fruit total soluble solid content decreased with increasing planting density. Supplemental CO2 enrichment may serve to increase the yield of strawberry grown in peat bag culture where little CO2 supply from the soil could be expected, and eight plants in a 80 cm long peat bag may be a reasonable planting density to obtain both high yield and fruit quality.
