Step 1, planting of wheat: apply quick-acting selenium-enriched element material to the wheat (the variety is Yangmai No. 12) that is in the jointing stage on March 20 every year, and the fertilization rate is 100 kg/mu. And the above-mentioned quick-acting selenium-enriched material is prepared through the following steps: Weighing parts by weight are 30 parts of urea, 10 parts of boric acid, 20 parts of potassium dihydrogen phosphate, 6 parts of selenic acid, 10 parts of zinc fertilizer, 0.1 parts of sodium nitrophenolate 60 parts and 60 parts of organic bean cake, pour all the above raw materials into the blender, and add 20% of the total weight of the material, and stir for 30 minutes to melt part of the material. After fully mixing, continue to stir to dry the material to the water content. Less than 8%; wherein, selenine is preferably selenocysteine.
Step II, acquisition and processing of wheat seeds: take the wheat seeds planted in step I, clean and drain the wheat seeds; then soak the wheat seeds in the first selenium solution for 8 hours, and the first selenium solution The temperature of the solution is controlled at 26° C., and the seeds are naturally drained after soaking; wherein, the first selenium solution is an aqueous solution of sodium selenite with a concentration of 0.05%.
Step Ⅲ, germination of wheat seeds: adjust the temperature of the cultivation room at 20°C, place the soaked and drained wheat seeds in each culture tray for cultivation and germination, wait for the germination of the wheat seeds to grow to 0.5-1 cm, and implement light control Liquid spraying operation, described light-controlled liquid spraying operation is: spray malt with the second selenium liquid (being the sodium selenite aqueous solution of concentration 0.03%) every 8 hours, the second selenium liquid spraying state is foggy, light during cultivation The control is that far-red light irradiation, no light darkness, and blue light irradiation are carried out alternately in sequence, and the irradiation intensities of far-red light and blue light are 100lx and 80lx respectively;
Step Ⅳ, malt grinding: after the length of the malt grows to at least 2cm, intercept it, and wet-grind and pulverize the intercepted malt segment to obtain a malt grinding slurry with a net weight of 55-65%, and add equivalent to Mix the mixed strains (obtained by mixing the three strains of Bacillus, crude fiber degrading bacteria, and yeast according to the mass ratio of 1:1:3) with 4% mass of malt grinding slurry, and then put the mixture in a fermenter for fermentation Treatment, the treatment time is 36 hours, the temperature of the fermenter is controlled at 30 ° C, and after the fermentation is finished, add the blended sugar (being isomaltulose, mannan, arabinogalactan, etc.) equivalent to 1% of the quality of the malt grinding slurry. The three sugars are obtained by mixing according to the mass ratio of 2:1:1), and finally vacuum-dried and pulverized to obtain the selenium-enriched Malt Extract.