TECHNOLOGY FOCUS - AGRICULTURE - Preferred Method: The method involves drying kelp and crushing, adding 6-8 times water to the crushed powder and heating in water bath at 55 degrees C for 1-3 hours, adjusting the pH to 2-7 using hydrochloric acid, adding 0.01-0.5% cellulase enzyme and 0.05-0.2% protease enzyme and hydrolyzing respectively for 5-12 hours and 2-5 hours, stirring and centrifuging the hydrolyzed kelp liquid. The process of extraction and separation involves adding 10-15 times kelp to 0.5-2% sodium carbonate solution and heating in water bath at 55-60 degrees C for 1-3 hours, adding 3-8 times water of 50-70 degrees C and diluting the obtained mixture for 0.5-2 hours, filtering through 250-400 silk mesh filter, adding 0.1-0.3% hydrogen peroxide to the filtrate and decolorizing at 60 degrees C for 0.5-2 hours, maintaining the temperature at 90 degrees C for 10-30 minutes and filtering through 300-500 silk mesh filter, adding 10% calcium chloride of 1-3 vol.% concentration to the filtrate, where the sodium alginate in the filtrate is converted to calcium alginate, allowing the calcium alginate precipitate to stand for 0.5-2 hours, filtering the precipitate using fresh water to wash calcium alginate fiber in the calcium chloride solution and other impurities, adding 10-15 times purified water and 1-1.5 times 10% sodium chloride solution to calcium alginate and heating in water bath at 50 degrees C, condensing using ion exchange method to convert calcium alginate into sodium alginate solution, precipitating using 95% alcohol to obtain sodium alginate, dehydrating, drying and crushing product. The process of ethanol fermentation involves activating yeast in the culture medium prepared by dissolving 1% yeast extract, 2% peptone and 2% glucose in water and sterilizing at 121 degrees C for 15 minutes, inoculating the activated yeast in pre-treated enzymatic liquid at 28-32 degrees C and fermenting for 1-3 days, sterilizing the pre-treated enzymatic liquid under high pressure, cooling to obtain activated enzymatic liquid, where the inoculation amount is 10-20%, fermenting the enzymatic liquid at 28-35 degrees C degrees and culturing for 3 to 7 days to obtain fermentation liquid and distilling fermented liquid to produce ethanol residual liquid of protein, nitrogen, phosphorus, potassium and other liquid and concentrating the ethanol fermented product. The yeast is yeast strain deposited as CICC3147. The method involves inoculating activated yeast in enzymatic liquid at 30 degrees C and fermenting for 7 days to obtain ethanol. The method involves distilling the fermentation liquid, concentrating to 40-60%, preferably 50%, spray drying and granulating to obtain fertilizer. ACTIVITY - Fertilizer.