For this diploma we have conducted an experiment near Mengeš at Drnovo field where the soil is mostly gravel based. We were trying to establish, how the complementary soil tillage affects on the quality and yield of carrot crop (Daucus carota L.). Cultivation was composed of early spring carrot of 'Bilbo' variety, Nantes type, harvested on loamy soil. We dealt with two types of complementary tillage. Firstly, we complementary processed the soil before sowing, with a rottary harrow which is used solely for the stiring of the upper section of arable land (15-20 cm). The secondary type of complimentary tillage was made with a rottary cultivator that, with the help of a high speed rotor using spikes, fragments the clumps. Stones and the remaining clumps are consequently burried under the bottom layer of the arable land (25-30 cm). The remaining soil is used for the ridges. The approach towards the sowing and crop care was in both types of the complimentary tillage conducted identically, in an integrated manner. When the soil was tillaged with a rottary harrow we have identified that the soil was composed of 20.5 % of stones bigger than 2 mm. When the rottary cultivator with spikes was used, the soil was composed of 9.07 % of stones bigger than 2 mm. The complimentary soil tillage of the crop yield using the rottary harrow resulted with the average germination of 73.3 % with 64,8 tons of carrot per hectar, of which 32.6 tons (50.3 %) were labeled as extra grade yield of carrot. The carrots were in general distorted 7,1°. The complimentary soil tillage using the rottary cultivator resulted with the average germination of 91 % with 75.6 tons of carrot per hectar, of which 49.5 tons (65.5 %) were labeled as extra grade yield of carrot. The carrots, in this case, were in general distorted 5.16°.
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