PRE-COOLING OR AN ARTIFICIAL STIMULATION OF THE MATURATION PROCESS OF WITLOOF-ROOTS (CICHORIUM INTYBUS L. VAR. FOLIOSUM) FOR EARLY FORCING.
The roots of three experimental series were pre-cooled, partly loose in a cold store and partly in airtight containers during 3–6–9 and 13 days at two temperatures (viz. 1°C and 4°C). Air-composition in the containers changed only by respiration. Although the production of loose stored roots is already favourably influenced by a cold treatment, pre-cooling under modified atmospheric conditions leads clearly to the best results, and then in particular with a temperature of 1°C. Within the experiments the optimal duration of the treatment was found to be 6 to 9 days.