group proved that the content of vitamin C was higher in
vegetables and fruits from organic farms [14-17].
Rembiałkowska reports that vitamin C concentration in
organically grown cabbage is higher by 10 mg/100g f.w. or
by 30% or even by 96% than in cabbage cultivated using
conventional technology [18]. Czapski’s research [19] on
13 plant species cultivated under varied conditions showed
that the vitamin C level in six of them was identical for both
technologies, while in the remaining seven species the content of vitamin C was higher in the case of organic cultivation methods. Bartkyavichyute, Evers, and Pither [20]
revealed a 15% higher vitamin C level in organic vegetables vs. conventional methods, while Schuphan [21] reported a 75% increase based on 12-year research. Chen [22]
and Worthington [23] also claimed the vitamin C content
was much higher in plants from organic farms compared
with the conventional technology. By contrast, other
researchers observed no relationship between cultivation
technology and vitamin C content, for example MeierPloeger et al. [24], Assano [25], Warman and Havard [26],
or Polish authors Jabłońska-Ceglarek et al. [27]. Hoefkens
et al. [7] report that significant higher concentrations of vitamin C were found in organic tomato, but significantly
lower concentrations in organic carrots and potatoes compared to the conventional alternative.