Growth and flowering of Allium L. ‘Ivory Queen’ forcing in artificial light condition

Abstract

The purpose of the following study was to determine the influence of the light colour onto the forcing of Allium ‘Ivory Queen’. The bulbs cooling was commenced on the 18th of October 2007. After 11.5 weeks the bulbs were planted into pots and the cooling continued. Joint cooling time was 20 weeks. The plants were transferred to the growth room on the 6th March 2008 and were placed on the shelves under the white, blue, green, yellow and red colour light for 6 or 12 hours a day. The quantum irradiance was 12,5 μmol.m-2.s-1. The obtained results indicate that Allium ‘Ivory Queen’ can be forced in pots under the blue light for 12 hours a day.