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This diploma thesis deals with the changes of individual components of the heat balance in the petrol engine with combustion for ethanol fuel. The work is divided into two parts. The first part, the theoretical one deals with the im-pact of the current state of internal combustion engines on the environment and are also dis-cussed alternative fuels. In the second part is described the methodology of experimental measurements, which were carried out on this topic in the engine testing laboratory of Mendel University in Brno. From the obtained values the final heat balance of the petrol engine run-ning on fuel containing ethanol is evaluated and compiled.

The aim of the thesis was to evaluate the enterprise management system with organic and conventional production. In 2013, the company Jamenská a.s., Jamné nad Orlicí cooperatives cultivated 542,14 ha of agricultural land the conventional way and 205,21 ha of agricultural land organically. Farms in the southeastern part of the Orlické Mountains at an altitude of 450 up to 730 meters, in the production area is the mountain (H1). On the basis of the data obtained from the period 2008 to 2012 have been calculated for both the Centre's basic environmental, economic and social indicators of sustainability evaluation. Overall evaluation of the agronomic indicators, both parts of the company for the entire reference period is very good, above the limit of sustainability. For conventional land balance has reached average values of N 46,89 kg.ha-1 (P) 5,8 kg.ha-1, (K) -29,77 kg.ha-1, the average supply of organic matter into the soil shall be 5,15 t.ha-1, the specific energy consumption 153,7 MJ.OJ-1, the intensity of plant protection is 54,49% of the average of the CZECH REPUBLIC and evaluation of biodiversity at 0,74. For erosion indicator was found violating the GAEC standards I and II. For the eco-farmed land balance N -3,2 kg.ha-1 (P) -5,7 kg.ha-1, (K) -38,63 kg.ha-1, the annual supply of organic matter into the soil is 3,5 t.ha-1, the specific energy consumption of 127 MJ.OJ-1, the intensity of plant protection 0% of the average of the CZECH REPUBLIC and evaluation of biodiversity 0,78. Also in the organic part of the GAEC standards have been infringed, I and II. Evaluation of economic indicators was also positive, the sales achieved by conventional parts were 22.021 CZK.ha-1 and in the ecology of 21.863 CZK.ha-1. The liquidity of the company for the whole of the reference period amounted to 3,65 and the debt ratio was 26,7%. From the social indicators were monitored, remuneration, working hours, holidays, health and safety at work, employee involvement in company management and social commitment. The values of sustainability was achieved for the rewards for work, vacation and employee involvement. Both parts of the company Jamenská a.s., work well and are sustainable.

The balance of potassium and phosphorus were observed at long-term 17-year field experiments with different fertilizing systems. The field experiments were located at five sites in the Czech Republic (Červený Újezd, Hněvčeves, Humpolec, Lukavec and Suchdol) with different soil and climatic conditions. The balances were observed at: treatments with organic fertilization (sewage sludge, FYM), treatments with mineral fertilization (NPK, N, N + straw) and unfertilized control treatment, as well. Two experiments were realized: one with crop rotation (potatoes, winter wheat, spring barley) at all mentioned sites and the second was monoculture maize experiment at Červený Újezd and Suchdol sites. The positive balance of phosphorus was at the treatments with sewage sludge (SS) as well as with farmyard manure (FYM) application and at the NPK treatment. The average phosphorus balance ranged between +1.8 and +14.0 kg/ha/year at the treatments NPK, between +7.2 and +21.6 kg/ha/year at treatments with FYM application and between +66.7 and +75.6 kg/ha/year at SS treatments, respectively. The balance of phosphorus with a higher dose of sewage sludge reached +249.6 kg/ha/year. The average negative balance of phosphorus (from -27.5 to -13.4 kg/ha/year) was calculated at the treatments N and N + straw. The balance of control unfertilized treatments ranged between -21.9 and -11.0 kg/ha/year. The average positive balance of potassium in the experiment with crop rotation was estimated at all of FYM treatments. The balance reached the values from +2.3 to +30.1 kg/ha/year. On the contrary, the balance at FYM treatment in experiment with maize monoculture was negative (-15.2 kg K/ha/year). The balance of potassium in experiment with crop rotation ranged between -9.5 and 33.2 kg/ha/year at the NPK treatments. Similar values were obtained in the experiment with monoculture, where the balance at the NPK treatment reached +32.1 kg K/ha/year. The negative balance of potassium (between -69.2 and -8.9 kg/ha/year) was obtained at treatments with sewage sludge application. The most negative balances were calculated at N and N+straw treatments (-104 to -55.0 kg/ha/year) and as expected at Control (-73.2 to -43.6 kg K/ha/year). The bioavailable soil phosphorus and potassium contents changes were in most cases in close relation with balances calculated. Soil variability in observed soil factors was found in the plots and confirms the assumption that the system of fertilization affects crop yields.

The aim of the thesis was to analyze and subsequent analysis of forest regeneration for the period 2003 - 2012 at the Training Forest Enterprise Masaryk Forest Křtiny. The bases for the analysis were the data from forest management records. Based on the data obtained there was made a comparison between natural and artificial regeneration of forest, it was compared to the proportion of first and repeated reforestation. Thesis also analyzes the recovery in relation to stand conditions and trees.