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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Uplatnění vybraných forem selenu při pěstování máku setého (Papaver somniferum L.)
 Tobek, Ladislav
Selenium is an essential element for human organism. One of the possible ways to increase its quantity in food is a biofortification of crops. Czech Republic is the largest producer of poppy seeds in the world, it could be therefore viable to increase the nutritional value of selenium in this crop. The goal of this thesis was a recognition of suitability of selected forms of selenium for biofortification of seeds of opium poppy (Papaver somniferum). Aside from the distribution of selenium in the plant of poppy and its accumulation in the harvested seeds this study also investigates the effect of its soil and foliar application on the yield and weight of a thousand of seeds. The selenium was applied into the soil in 150, 300, and 600 g Se.ha-1 doses in the form of SeO32- and SeO42- in our one-year container experiment. The same forms of selenium were also applied foliarly in the 20 and 40 g Se.ha-1 doses in our one-year small-plot experiment. It is evident from the analysis of the distribution of selenium in the individual parts of the plant that selenite was accumulated primarily in the lower part of the plant (stalk and leafs) and only a maximum of 25.1% of the total was integrated in the capsule. Selenium, in the form of selenate, was contained in the capsule at a rate of 39.9 to 62.6% of the overall weight of the selenium contained in the whole plant. Soil and foliar application did not influence the yield and weight of a thousand of seeds. In both the container and field experiment the application of an increasing amount of selenium in the form of both selenite and selenate has significantly increased its presence in the harvested seed. Our results suggest that selenate is a better form of selenium for the biofortification of poppy.
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Fortifikace máku (Papaver somniferum L) selenem
 Tobek, Ladislav
Selenium is one of essential elements for the human body. A possibility of its addition to our food is to consume fortificated crops. Subject of this thesis was to study the effect of foliar application of selenium in poppy (Papaver somniferum L.) to its concentration in plants, in seeds and to seed yield. The reason for fortification was to increase the concentration of this element in seeds with an impact on its production. In one-year small-plot experiment was selenium applied in the form of Na2SeO3 in four doses (25, 50, 100 and 200 g.ha-1). Foliar application of selenium had a positive impact on increase of its concentration in plant dry matter. In contrary, there was a decrease of dry matter weight per plant. Application of selenium negatively affected uptake of nitrogen by plants of poppy. Selenium fortification increased seed yield up to 13,8 % (doses 25 a 50 g.ha-1), which wasn't statistically significant. As qualitative parameter was discovered an increase of selenium concentration in seeds. Due to reduced yield at the high doses, it seems that most appropriate dose of foliar application of selenium is 50 g.ha-1.
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