Overzichtsdocument: 7 jaar Chrysant op water

Over a period of seven years (2009-2016) hydroponic chyrsanthemum cultivation has been developed andtested in practice. Where the system delivered up to 25% higher yields at smaller scale, the larger systems of250-300 m2 turned out very sensitive to root infection. Research then focussed to understanding the key factorsthat caused the plants to become sensitive. However, where the larger system showed much disease incidenceevery summer for three years in a row, at smaller scale the symptoms could not be induced despite applicationof extreme cultivation measures.The studies were the first to apply next generation sequencing to microbial populations in cultivation systems.The results gave evidence for shifting population dynamics due to inoculation and water temperature. Also theinoculation with beneficial microbes was found to have a positive effect on recovery of the roots upon infection.This effect, however, was only found in the research-facility. At larger scale potential beneficial effect could notprevent significant yield loss.