ARTIFICIAL LIGHT AS A SUBSTITUTE FOR DAYLIGHT IN FORCING OF TULIPS

In four-year experiments on tulip forcing in artificial light conditions, the possibility of reduction of electricity costs was considered.

Darwin Hybrid tulips were forced in a growing room where, as a source of artificial light, incandescent lamps, blended – light lamps and high-pressure mercury fluorescent lamps were used.
The influence of 6 – 14 hour daylengths and 250 – 2000 1x light intensities on quality of flowers and duration of forcing periods were investigated in the standard method as well as in the +5°C method.
One group of plants was forced in daylight.

In forcing of tested cultivars, a 6 hour daylength and a 250 1x intensity of light were sufficient.
A 1000 1x light intensity was more advantageous for +5°C tulips only.
Flowering of plants in this treatment started 3–5 days earlier.

III International Symposium on Flower Bulbs

M. Jerzy

https://doi.org/10.17660/ActaHortic.1980.109.14