THE EFFECT OF TEMPERATURE AND LIGHT INTENSITY ON FLOWERING IN SAINTPAULIA IONANTHA WENDL

H. Hildrum, T. Kristoffersen
Post (1942) and Nuernbergk (1961) have shown that Saintpaulia is a day neutral plant. Growth and flowering of this plant have, however, been found to be strongly affected by temperature and light intensity. Went (1957) reported in his book 'Experimental control of plant growth' that Saintpaulia prefers somewhat higher night than day temperature. He recommends a night temperature of 20–23°C and a day temperature of 14°C. Went has also shown that optimum temperature for growth and flowering was higher with low than with high light intensity. Herklotz (1964) has later found that optimal growth and flowering of Saintpaulia occurred at constant day and night temperature 20 to 25°C.

Stinson and Laurie (1954) have shown that the light intensity is very important for the flower formation in Saintpaulia. They found that the plants flowered with light intensities from 5000 to 13000 lux. Post (1942) recommended a light intensity of 10 000 to 15 000 lux for old flowering plants, and 5000 to 8000 lux for young vegetative plants.

In order to obtain more information about the effect of day and night temperature and the interaction between temperature and light intensity the following three experiments have been carried out.

Hildrum, H. and Kristoffersen, T. (1969). THE EFFECT OF TEMPERATURE AND LIGHT INTENSITY ON FLOWERING IN SAINTPAULIA IONANTHA WENDL. Acta Hortic. 14, 249-259
DOI: 10.17660/ActaHortic.1969.14.27
https://doi.org/10.17660/ActaHortic.1969.14.27

Acta Horticulturae