LONGDAY GLASSHOUSE – SHORTDAY GLASSHOUSE SYSTEM IN THE YEAR-ROUND CHRYSANTHEMUM PRODUCTION

The cost connected with chrysanthemum production can be significantly limited.
This chance is given by the direct shortday planting system for the year-round cut flower chrysanthemums, used in Poland since 1974.

It is possible to keep the vegetative plants in a separate area for the whole of the longday period.
As a consequence only shortday treatment would be required in the flowering area.
Depending on cultivars, 4 – 5 crops per year are possible.

This planting system was examined in Polish climatic conditions.
The rhytmics of the growth and flowering of 9 – 11 week cultivars was investigated in relation to various light conditions changeable during a year.
The shortest period of the generative development and the highest quality showed the plants grown during the spring and summer season.
The duration of generative development reached its maximum from November 1 to February 15. Many cultivars in that time lost their capacity for flowering.

Symposium on Chrysanthemum

M. Jerzy

https://doi.org/10.17660/ActaHortic.1982.125.17