Abstract. The research was conducted in a greenhouse on kohlrabi grown in peat. The following were investigated: yield, dry matter, vitamin C, NO₃, Ca, Mg, P, K in the leaves and in stems. Plants were fertigated with a nitrogen 0.3; 0.6; 0.9; 1.2 g·dm^-3 of substrate.

The effect of different nitrogen fertilization on yielding
of kohlrabi and chemical composition in leaves and stems

Summary

The effect of increasing doses of nitrogen (NH₄NO₃) on yield of kohlrabi was investigated. The greenhouse experiment was conducted in 2-litre plastic bands filled with peat substrate. Leaves of kohlrabi contain higher amount of dry matter, vitamin C, NO₃, Ca, Mg and lower P, K than in stems. It was found on the basis of the yield leaves and stems and chemical composition optimum concentration of mineral nitrogen was 100-160 mg·dm^-3 of substrate.