Abstract. The aim of this study was to evaluate the effect of two levels of calcium (100 and 200 mg Ca²⁺ dm^-3) derived from Ca(NO₃)₂, Ca(NO₃)₂ + 30% CaCl₂ and CaCl₂ on the yield and occurrence of blossom-end rot in greenhouse tomatoes ‘Geronimo F₁’ and DRW 7428F₁ (type Cunero).

The effect of differentiated calcium fertilization on yield
of tomato cv. ‘Geronimo F₁’ and DRW 7428F₁ (type Cunero)
grown in rockwool

Summary

The effect of two levels (100 and 200 mg Ca²⁺·dm^-3) and three forms of calcium (I – Ca(NO₃)₂, II – CaCl₂, III – Ca(NO₃)₂, +30% Ca in CaCl₂) on yield, mean weight, blossom-end rot of greenhouse tomato cv. ‘Geronimo F₁’ and DRW 7428F₁ (type Cunero) was studied. Both, total and marketable yield as well as the mean fruit weight of ‘Geronimo F₁’ was significantly higher as compared with DRW 7428F₁. The highest total and marketable yield was obtained for tomato cv. ‘Geronimo F₁’ grown in solution containing 200 mg Ca as CaCl₂. Statistical analysis revealed a distinct correlation between mean weight of fruit and occurrence of bloosom-end rot.