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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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Biofortifikace slunečnice roční (Helianthus annuus L.) selenem
 Vágnerová, Lucie
The diploma thesis is focused on a small-plot year-long experiment, carried out in 2013. The experiment monitored reaction of sunflower's (Helianthus annuus L.) hybrid NK Brio to foliar fertilizing with selenium, applied in the form of sodium selenite (Na2SeO3) during growth stage R1, at rates 50, 100, 150 and 200 g Se.ha-1. Foliar application of selenium at rates 50 - 150 g.ha-1 caused stimulation of weight of a plant biomass and nutrient uptake (esp. N, Mg and Se). Rate of 200 g Se.ha-1 inhibited plants' growth. Sunflower achenes yields were not statistically significantly influenced by foliar application of Se (p0,05). The most significant effect of foliar application of Se was its content in sunflower achenes; the amount of Se increased significantly (p0,05) in a linear relationship (r = 0.9824) to the graded rates.
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