Experiments involving sweet pepper of ’Red Knight’ F₁ cultivar were carried out in 2008–2010 in a greenhouse. They aimed at evaluating the influence of foliar feeding using diverse preparations and rates of calcium on yielding, dry matter, sugars, and vitamin C contents in sweet pepper fruits. Following forms of calcium were used in the experiment: Ca(NO₃)₂, Librel Ca, and Wapnowit. Calcium was applied in the amounts of 0.4 g Ca ∙ plant^-1 (10 treatments) and 0.2 g Ca ∙ plant^-1 (5 treatments). No significant influence of applied calcium feeding on the pepper fruit yield size was recorded, while it significantly reduced the number of fruits infected by apical blossom-end rot (BER) at calcium-fed of Librel Ca plants as compared to the control. No significant effect of studied factors on dry matter content was found, although its lower level in pepper fruits harvested at the initial stage of fruiting was prominent. The influence of calcium feeding on monosaccharides and total sugars concentrations was positive when 0.2 g Ca ∙ plant^-1 (5 treatments) in a form of Wapnowit was applied. Considerably higher vitamin C concentration in calcium foliar-fed pepper fruits as compared to the control was recorded.

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