Varieties for forcing
The main botanical garden for forcing is recommended the following varieties of tulip with "in: for the early and middle term - Apricot Beauty( cream-pink), Christmas Marvel( dark pink), Moai Mile( red), Prominax( dark red), Dick Favoritred), Gander( raspberry-pink), Mio-ram( carmine-crocked with white border), Olga( crimson-red with white border);for late distillation - Alburie( dark red), Hiberina( white), Atom, Diplomat, London and Parade( red), Dutch Princesses( brownish-pink).
Of the varieties of daffodils, the most suitable for distillation tubular and tachetoid: for medium distillation - Barret Browning( white with an orange crown), Cragford( white with a yellow crown), Kalton( yellow);For later distillation - Master( lemon yellow), Golden Harvest( yellow), Geranium( white with yellow crown), Flower Record( white with orange crown), Mount Hood( white with cream tube), Actaea( white with red-orange crown).
The best varieties of hyacinths are: for early distillation - Amsterdam( dark pink), Anna Maria( light pink), LINNOSANCE( white);for medium and late forcing - Amethyst( lilac-pink), Pearl Brilliant( blue), Lady Derby( pink).
Dutch flower growers use an advanced method of forcing bulbs, which consists in pre-processing them with certain temperatures depending on the timing of forcing. Below are given the data of E. Zaytseva
The humidity of the air during bulb storage is maintained in the first two or two and a half months - 70-80 percent, in the rest of the time - 60-70 percent.
Recently, in the Netherlands, it has been established that an earlier development of flowers in a tulip bulb can be obtained if they are stored for a week at a temperature of 34 ° immediately after excavation.
The time between digging and heat treatment should not exceed four days. The earlier the excavation is performed, the more effective the thermal treatment. Then the bulbs are kept at a temperature of 17-20 ° until the stage of full development of the flower with the ovary and pestle, after which the temperature is reduced to 5 °.At the end of October, the bulbs are ready for planting in the greenhouse soil. For the Darwinian hybrids( Parade, London, Bolshoy Theater, Diplomat) to blossom by January 1, the temperature of the greenhouse soil should be -10-13 °, and the air-16 °.