|Author: ||N. Bredmose|
Corms of the varieties 'Ballerina' and 'Golden Melody' treated at 30°C for 16 weeks were given cooling treatments for 4 weeks at 9°, 15°, 17° or 21°. Thereafter the corms were planted in glasshouse and cultivated at different minimum air-temperature- regimes: 9°C, 12°C, or 15°C. Crops of all combinations of the treatments were planted every 8 weeks throughout the year.
The results show that there is a general interaction between the cooling temperature and the growing temperature.
Besides, the varieties respond differently to the treatments and also the season pays an important role.
Netto-values of crops of the different treatments have been calculated taking into account the following parameters: the number of flowers produced, their average wholesale price according to grade and season, and finally the fuel costs of the cropping period.
In this way data for economically optimum cropping throughout the year have been encircled and they are discussed.
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