Flowering and vegetative growth of strawberry. I.

Effect of photoperiod under constant temperature conditions

Abstract

1. The response of strawberry plant (var. Red Star) to day-length treatments under constant temperatures (20°C and 30°C) was examined.
2. The vegetative growth was much inhibited at 30°C, while it was normal at 20°C. Long daylength promoted the growth of crown, especially the length of leaf and of first cluster.
3. Although flowering was observed at 20°C irrespecitive of day-length, only the plants treated with long day-length after November 1 flowered at 30°C.
4. It was reaffirmed that the long day-length inhibits and promotes the flowering when given before and after the flower bud differentiation respectively. Therefore, the later the long-day treatment in autumn, the sooner the flowering.