Qualität und Ertrag von Öko-Zwiebeln: Vergleich von Pflanzung und Direktsaat

Yield and quality (bulb size, sugar content and composition, pungency, initial sprout growth) of early and late transplanted and directly sown onions (cv. Sturon) were compared in field experiments (2009-2011) at different intensities of weeding (weed-free or mechanical weed control only). Early transplanting (weed-free) resulted in the highest yield and best quality performance, whereas late transplanting combined with mechanical weed control only (including harrowing weeds before transplanting onions) resulted in medium yield and quality, however, at a relatively low work-input. It is suggested that infection by powdery mildew was the key limiting factor in the development of yield and quality in late-transplanted and directly-sown onions.