The studies were conducted in 2010–2012 at the Research Institute of Horticulture in Skierniewice. The aim of the research was to determine the yield of celeriac, its storage ability and nutritional value, depending on weed management methods. In the field experiments the following methods were compared: the use of herbicides, herbicide + mechanical treatment, mechanical treatments, soil mulching with polypropylene and biodegradable foil, soil mulching with polypropylene + biostymulant AlgaminoPlant and hand weeding. After harvest celeriac roots were stored at the temperature 0°C for 213–216 days and after storage were sorted out into the following groups: healthy roots without symptoms of re-growing, healthy roots with symptoms of re-growing, roots with diseases and rotting symptoms. The natural weigh loss was also determined. Chemical analyses were performed after harvest and storage period. These analyses consisted of evaluation of dry matter, ascorbic acid, total sugars and soluble phenols content. The highest yield after the storage period was obtained from plants treated with linuron and additionally mechanically weeded and the lowest from not weeded. After the storage the lower contents of dry matter, in comparison to stored celeriac, were determined. Ascorbic acid contents in celeriac grown in biodegradable foil and weeded by hand was higher than in other methods. The contents of soluble phenols after storage was higher than after harvest, except celeriac treated with flurochloridone.
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