2026 年 64 巻 2 号 p. 81-85
For strawberry (Fragaria×ananassa Duch.) production in a plant factory with artificial lighting and a growth shelf with a fixed height, we noted that a cultivar with a greater plant height (tall cultivar) had a higher photosynthetic rate and yield than those of a cultivar with a lesser plant height (dwarf cultivar) due to the variation in light intensity induced by different distances from the light source to the plant. We hypothesized that the dwarf cultivar could have the same yield level in the same light intensity as that of the tall cultivar by positioning the light source close to the plant. Here, gas exchange, growth, and yield were measured in three treatments (a tall cultivar, a dwarf cultivar with a closer, and that with a conventional distance from the plant to the light). The photosynthetic rate and yield of the dwarf cultivar positioned closer to the light source were almost the same as those of the tall cultivar and higher than those of the dwarf cultivar placed a conventional distance from the light source. This demonstrates that improved productivity should be possible by adjusting the position of the light source according to the plant height for each cultivar.
