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This thesis is focused on an experiment dealing with fertilization of silage corn. The experiment was realized in 2021 in the agricultural enterprise Zemko Kožlí a.s. The field experiment was founded with a hybrid ES Joker and was fertilized with various combinations of fertilizers. In total, eight fertilization variants were created for the experiment in two repetitions. Fertilizers DAM 390, Urea and Amofos were used for fertilization. During the vegetation, differences between fertilization variants were monitored, namely in the number of plants, increase of above-ground biomass, weight of individual plants, weight and number of individual buds, and finally in the total yield from each variant. An additional criterion-em was the evaluation of the percentage of dry matter and the economic evaluation of each variant. The largest yield was recorded for the variant that was fertilized only with nitrogen in the fertilizer Urea. The lowest yield, on the other hand, was for the fertilized phosphorus variants in the fertilizer Amofos in combination with nitrogen in the fertilizer DAM 390. With the increasing dose of industrial fertilizers, the yield of biomass decreased. Experiments of corn fertilized with phosphorus reached higher dry matter.

The bachelor's thesis presents the results of an experiment with spring barley. The experiment was established in 2016 in the business of Bc. Jiří Nepovím in Opatovice, region of Světlá nad Sázavou. The experimental cultivar of spring barley was Laudis 550. The subject matter of the experiment was intensificated dosage of nitrogen and its effect on yield and qualitative elements. The experimental dosages of nitrogen were set on 60 kg.ha-1, 90 kg.ha-1 and 120 kg.ha-1. Once the dosage was increased by 30 kg.ha-1, the content of nitrogen substances in the grain increased of 0,9 % and proved to be by 0,5 t.ha-1 higher in the total yield

Bachelor thesis focus on evaluation of the specific barley cultivars and its harvest profit ratings in the agricultural business conditions " Agricultural businessman Kantor Václav". Values of the harvest profit ratings, amount of plants and its offshoots, quantity of barley spikes per square unit, number of grain in the spike, thousand grain weight of chosen barley cultivars were monitored on the selected location. Between the chosen barley cultivars were Malz, Sebastian, Laudis, Kangoo, Xanadu, Sunshine a Bojos. The results were recorded in tables and charts. In the final comparison of all parameters were found to influence different varieties to yield element. In this one-year pilot experiment achieved the highest yield varieties Sebastian and Xanadu , which would bet he most suitable varieties in this business. Both varieties showed an exellent ability tillering, thereby creating more productive cob. It was confirmed that the spring barley yield consists predominantly number of ears.

The aim of my thesis is to assess the basic yield factors in the studied varieties of spring wheat. In the year 2013, there were in the framework of the test sown eight varieties (Brawura, Corso, Epos, Granny, Scirocco, Septima, Tercie and Vánek) at the land of the Faculty of Agriculture, University of South Bohemia in Ceske Budejovice. During the vegetation the number of plants, the number of sprouts and the number of spikes was recorded using a quarter tape. The data are in the results section and are converted to 1 m2. Additionally, the infestation by diseases, pests and overrunning with weeds was monitored. Before harvesting, the samples were taken for an evaluation of the number of grains per spike and HTZ. In the results section the main factors of the yield are statistically evaluated. These include the number of spikes, the number of grains per spike and HTZ. The study also evaluates the theoretical and the actual yield and the bulk density. The average number of ears in the varieties of spring wheat ranged from 411 (Corso) to 564 (Epos) ears per 1 m2. The number of grains per spike of individual varieties reached higher values, from 39,6 (Scirocco) to 57,8 (Corso). The average HTZ for the individual varieties was between 34,9 and 43,5 g. At finding of the real yield there were observed values from 3,4 t.ha-1 (Septima) to 4,5 t.ha-1 (Scirocco). The difference between the yield elements of were statistically significant all varieties.