Diploma thesis is aimed at determination of chemical properties in Phaeozems. We evaluated nutrients content, humic substances content and quality in different subtypes of Phaeozems. Standart methods of determinations of soil properties were used. Results showed very hight quality and fertility of studied Phaeozems.

This thesis deals with the influence of 5 and 15 % milk thistle seed cake supplements in the compound feed for fattening broiler chickens Ross 308. The number of 75 roosters was divided into three equal groups, whilst the first experimental group (MT5) received the compound feed containing 5 % of milk thistle, the second experimental group (MT15) received the compound feed with 15 % of milk thistle seed cake. The third group, the control (K), was fed a mixture without any addition of milk thistle. We were recording and evaluating an average weight, weight gains, the feed consum-ption, the feed conversion and the carcass yield. The feed consumption was significantly lower in both groups fed with the milk thistle supplement, the feed conversion ratio also decreased in both experimental milk thistle groups, the optimal values being reached only in the control group. The carcass yield was obviously affected in a negative way (P <0.05) by the addition of the milk thistle supplement. Therefore we can confirm that the milk thistle supplements in the amount used in this experiment are not a suitable com-ponent in the compound feed of broiler chickens.

This thesis deals with the nowadays tractors construction. Theoretical part is divided into three subgroups - tractor engine, powertrain and chassis. The problematics of emission limits is discussed in the first subgroup. Major part of second subgroup is devoted to hydro mechanical powertrain. Finally wheeled and tracked chassis construction, tyre construction and automatic tire inflation systems are described at the end of theoretical part of the thesis. Practical part devotes to methodology and field measurements with the aim on various weight distribution of the tractor. Measurements were realized with CASE IH Magnum 370 CVX tractor. Obtained values are processed into graphs and charts. Subsequently the dependencies of wheel slip and pull power properties on pulling force of the tractor are created. Conclusion of the thesis provides recommendations for optimal weight distribution of the tractor for pull power operations.

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