You are now on the AHDB Horticulture and Potatoes website.
Please click here to access the main AHDB website and other sectors.
Please click here to access the main AHDB website and other sectors.
These pages focuse on the irrigation requirements of onions on loamy sand and sandy loam soils, on which the majority of onion production is located.
Irrigation is critical for bulb onions in the middle part of the season, from bulb initiation to egg stage in early August. Towards the end of the growing season, more irrigation may increase bulb size but increases the risk of foliar diseases.