INFLUENCE ON ONION (ALLIUM CEPA) YIELD AND INTERNAL QUALITY OF BIOADDITIVE TREATMENT

For organic growers is very important to increase yield and quality of production by using suitable bioadditives. Onion is the most economically significant member of the Asparogyles. Also, it is a good source of vitamins, minerals, polyphenols as well as carotenoids and antioxidants. The field experiment with total size of 128 m2 was conducted to study the effect of three bioadditives on yield and quality of two cultivars of onion Allium cepa L., Stuttgarter ricsen, and Rote Laaer during 2016 in Lednice, Czech Republic. The experiment was set according to the Latin square system in four repetitions including control. Bioaditives, B-Stimul, EkoBooster 2 and Vermifit A were used during vegetation period. Bioaditives. B-Stimul contains Azotobacter, Azospirillum, Herbaspirillitm, Chlorella. EkoBooster 2 which contains organic matter, N. P, K stimulates, and Vennifit A composition nutrients in immediately acceptable forms, plant hormones, enzymes, coenzymes, sugars, extract of compost of Californian earthworm. The treatment Vermifit A was applied four times during vegetation period, while B-stimul and Ekobooster 2 three times. The total and market yield and the content of vitamin C and carotenoids were determined. The influence of the treatments on those parameters was evaluated. The bioadditives treatments affected content of vitamin C. carotenoids, as well as marketable yield. The results indicated in the cultivar Stuttgarter riesen the highest content of vitamin C (46.05 mg/kg), and carotenoids (14.60 mg/kg) found in B-stimul. In the cultivar Rote Laacr the highest content of vitamin C was found in control (17.47 mg/kg), and the highest content of carotenoids in EkoBooster 2 (7.54 mg/kg). Also, this cultivar showed the highest market yield in control (3.12 kg/m2), while cultivar Stuttgarter riesen the highest market yield in EkoBooster 2 (3.48 kg/m2). The study showed that between cultivars and treatments there were no statistically significant differences in total yield.