De invloed van licht en temperatuur op de periodieke ontwikkeling van de aardbei (Fragaria grandiflora Ehrh.) en de beteekenis daarvan voor de teelt

The morphology and yearly development of the strawberry were described from the literature and from research, particularly those of the cv. Deutsch Evern in the Netherlands. In the successive chapters, the following subjects as influenced by season, temperature, light and humidity were treated separately: the formation of runners and the effect of removing them; the formation of leaves and lateral crowns, and the effect of removing flower clusters; the induction of the preprimordial flowering state, dependent on short days (SD) of 6, 8, 10 or 12 h for at least 6 days and mostly about 2 weeks; with 10_ to 15_C induction also after longer days; the inert state in autumn and the inhibited state in winter; the elongation of flower clusters (the longer the SD treatment during floral induction, the shorter the axis of flower clusters and the longer the flower stem); flowering and fruit set; fruit formation and harvest (in summer about 100 days between the start of SD treatment and fruit ripening).Descriptions were given of the general methods of culture. Finally followed a survey of existing methods and those developed by van den Muijzenberg from his experiences with temperature (heating, cold treatment) and light (SD treatment, LD treatment, artificial light supply). Eleven methods were described for different year periods, by different environments and environmental changes to get a year-round culture. Three methods of eliciting several yields a year were elaborated.