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Response of potatoes to split application of nitrogen and plant auxiliaries
MICHALÍČEK, David
The aim of the diploma thesis wasto evaluate the yield of tubers and the share of starch in tubers in potato varieties with different growing seasons and to point out or refute the need for nitrogen during cultivation. Next, to focus on the effect of nitrogen fertilization on dry matter and starch content. It was a small plot experiment, which was based on the Valečov experimental station. Two varieties were selected for the experiment, the early and the semi-early ones. The first variant is a plant not fertilized with nitrogen. The other variant was fertilized before planting. In another variant, a split application of nitrogen was performed, and in the fourth variant, an auxiliary plant preparation was applied, supporting stolon growth and root formation. The experiment further records treatment and conditions during the growing season. Individual differences between the varieties were also recorded during the experiment. For variants 2 and 3, the effect of fertilization on the yield of potato tubers in both varieties was demonstrated. The yield also increased significantly in the variant with the use of an auxiliary preparation. The semi-early variety Antonia reacted best to the auxiliary herbal preparation and the early variety Colomba achieved the highest yield in the variant with foliar application of urea. Antonia recorded a yield of 58.4 t/ha for the control variant, 64.3 t/ha for the second variant and 66.9 t/ha for the third fertilizer before planting. The variant with an auxiliary product then recorded a yield of 68.53 t/ha, which was a higher yield compared to the control variant by 10.1 t/ha. For the very early Colomba variety, the yields for the variant without fertilization were 66.14 t/ha, variant No. 2 then 83.18 t/ha, the variant with fertilization before planting recorded a yield of 79.26 t/ha and the variant with auxiliary product 78.85 t/ha. The differences between the fertilized variants during the growing season were 4.23 t/ha for the Antonia variety in favor of the auxiliary plant preparation. For the Colomba variety, the difference was 4.33 t/ha in favor of the urea variant. At the same time, the size ratio of the tubers also changed. In the case of the Antonia variety, there was a decrease in starch content in the fertilized variants, but in the case of the Colomba variety, the decrease was not confirmed in all variants.
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Uplatnění kapalných hnojiv s dusíkem a sírou ve výživě silážní kukuřice
Robotková, Kristýna
This master thesis is focused on study of nitrogen nutrition patterns for silage corn. The main goal is to determine the impact of combination of liquid fertilizers DAM and SAM with inhibitors of nitrogen conversion applied at selected dates on yield and quality of silage corn. The experiment was implemented in form of small field experiment near Budišov. The nitrogen was applied in SAM and DAM fertilizers at a dose of 120 kg N.ha-1, in a single dose (basic fertilization) and divided to 60 kg N.ha-1 for basic fertilization and 60 kg N.ha-1 for the 8th leaf stage. Equivalents with addition of nitrification and urease inhibitors were created with listed combinations. The significant influence of the type of fertilizer and the term of its application on the yield of silage maize has not been determined. The highest yield was achieved after a split application of DAM fertilizer, which was 8,6 % higher compared to its application at the time of basic fertilization. The usage of inhibitors increased the yield compared to their untreated equivalents in the range of 2,57 - 4,79 t.ha-1. Nitrogen fertilizer application significantly influenced the N content of whole plants and sticks. The highest content of N was observed in the DAM fertilized variant at the time of basic fertilization. The dry matter and pulp of the total harvested corn were not significantly affected by the fertilizer and the term of their application. The effect of the tested inhibitors did not show up on any of the qualitative parameters.
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