###### Abstract
In the nature, Se can be found in inorganic and organic forms. The Se occurs as selenate (SeO\({}_{4}^{2-}\)), selenite (SeO\({}_{3}^{2-}\)), selenide (Se\({}^{2-}\)), and elemental Se, whereas in organic form Se is present as SeCys and SeMet [18]. Elemental Se, organic selenides, or metal selenides must first undergo microbial or chemical transformation to selenates before they become available to plants [19]. Selenate oxyanions (SeO\({}_{4}\)\({}^{2-}\)) are the most prevalent form in agricultural soils and they are more dissolved in the soil and therefore, more available than selenite oxyanions (SeO\({}_{3}\)\({}^{2-}\)). The ability to accumulate selenium in plant tissues varies. In plant tissue, SeO\({}_{3}\)\({}^{2-}\) is transported by a phosphate transport mechanism, whereas SeO\({}_{4}\)\({}^{2-}\) is found to be transported through sulfate transporters and channels [18]. Some plant species using sulfur (S) transporters and biochemical pathways can accumulate selenium instead of sulfur to such an extent that 0.1-1.5% of the dry weight of the plant forms Se, which does not have a toxic effect on plants [20; 21]. In plants, Se can alleviate oxidative stress in the chloroplasts. Most of the reports from the literature confirmed no effect of Se on seed yield [22]. For foodstuffs, selenate or selenite can be expected to have a similar impact on the selenium's nutritional status [23]. Zinc is contained in the soil in various forms, and its total content is quite different and depends mainly on the zinc content in the parent rock and the nature of the soil-forming process. In the soil system, Zn accumulates mainly in the humus horizon, in amounts depending on soil properties such as pH, colloid content, etc. Zinc enters plants via the root absorption of Zn\({}^{2+}\) from soil solution through passive nutrient transport--mass flow, root interception mechanisms (i.e., root growth), and diffusion [24]. At high pH of the soil, Zn is absorbed as ZnOH\({}^{+}\) cation. The mobility of zinc in the plant is low. Zinc is an essential element for plants, as it is a structural element and cofactor of a number of enzymes and proteins involved in a number of biochemical processes [25]. Zinc deficiency in plants causes the inhibition of photosynthetic activity chlorosis in young leaves, shortened internodes, and decreased dry matter [26]. The usability of micronutrients highly depends on the pH of the soil solution [27; 28], and the content of water, soil moisture, temperature, oxygen, iron oxide, and aluminum in the soil. In a slightly alkaline aerobic environment, the availability of selenium for plants is the highest. In calcareous soil, the availability of Zn is in deficit [29]. The availability of micronutrients generally decreases in acidic media [24]. Even though soybeans originate from China, which is widespread, nowadays, soybean is grown in over 90 countries worldwide; the biggest producers of soybeans in the world are \"the big three\": Brazil, SAD, and Argentina [30]. Compared to other annual field crops, soybean is the largest protein producer per unit area [31; 32; 33; 34; 35; 36]. Depending on the genotype, the amount of protein in soybeans varies from 35 to 45% [37; 38], and it is widely directly or indirectly consumed. Soybean is one of the main foodstuffs for people who practice a vegetarian or vegan diet. Soybean is also used as a concentrated source of valuable nutrients in underdeveloped and developing countries where the rate of malnutrition is high. Another important use of soybeans is for livestock, which is even more important to raise quality and micronutrient status [39]. In intensive livestock production, the most important is the quality of feed, which can be highly improved by adding plants rich in micronutrients [40; 41; 42; 43; 44; 45]. Soybeans as the high-protein crop are one of the best candidates for agronomic biofortification. In a comparison of several Fabaceae such as soybean, bean (_Phaseolus vulgaris_ L.), pea (_Pisum sativum_ L.), lentil (_Lens culinaris_ Med.