The aim was to assess the effects of fertilising by a different forms of suplhur on the conten of the water - soluble suplhur in the soil, yield of seed and the oiliness of winter rape. The experiment was conducted in the form of a small-plot field trial at ŠZP in Žabčice in the farming years 2012/2013 and 2013/2014. There were 6 different variants enrolled in the experiment: 1. unfertilized variant, 2. LAD (ammonium nitrate with dolomite) + LAD, 3. DASA (ammonium nitrate and ammonium sulphate) + DAM 390, 4. DASA + DASA, 5. WIGOR + LAD, 6. WIGOR + DASA. Fertilizer DASA containing sulphate form and fertilizer WIGOR including elementary sulphur. All variants of experiment despite of unfertilized soil were fertilising with nitrogen (195 kg per hectare). It was divided to regeneration, the first and the second production fertilising. In the variant 5 and 6 was apllied 60 kg of Wigor S including elementary sulphur. In the variant 3,4 and 6 was apllied DASA containing sulphate form. Fertilizers including sulphur had got the positive effect on the conten of the water - soluble suplhur in the soil. Fertilising with sulphur hadnt influenced ratio between nutrients in plants of winter rape and hadnt increased the yield of grain. Values relating to oiliness of seed were statistical different. Grain of winter rape from unfertilizing parcel had got higher oiliness than grain from fertilizing parcel.

The aim of this thesis was gathering current literature data on factors (internal - the type, stage of development) and (external - soil and climatic conditions for cultivation) that most affect the oil content in the genus Mentha L. On the basis of the results obtained during laboratory analysis of quantitative content of essential oils in plants of the genus Mentha L. taxa planted on an experimental plot of garden-technical faculty in the refrigerator was a hypothesis based harvesting time, the impact of species and cultivars on the essential oil content is confirmed. Further, the predicted calculation that based on the current state of the essential nutri-ents in the soil experimental plot could be the addition of nitrogen fertilizer to increase the amount of green mass, and while maintaining the integrity of the plants, especially leaf area increase the total yield of oil from the cultivated taxa genus Mentha L. The direct impact of climatic conditions on essential oil content was not established due to the very dry summer with little rainfall and dependence on irrigation.

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