▎ 摘　　要

NOVELTY - Oxygen fertilizer is prepared using 30-50 pts. wt. urea, 5-10 pts. wt. amino acids, 8-16 pts. wt. graphene, 15-30 pts. wt. humic acid, 10-16 pts. wt. biochar, 10-16 pts. wt. hydrogen peroxide and 15-25 pts. wt. trace element solution. USE - The oxygen fertilizer is useful as soil improver for promoting plant photosynthesis and stimulating crop growth. ADVANTAGE - The oxygen fertilizer increases agricultural productivity, has synergistic effect, slows release of oxygen and improves quality of agricultural products and sustainability of crop growth. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for method for preparing the oxygen fertilizer, which involves (a) soaking biochar in 20-50 wt.% trace element solution and baking at 300-400 degrees C for 3-4 hours to obtain amphoteric biochar, (b) cooling the amphoteric biochar for 24 hours, uniformly mixing the amphoteric biochar, urea, amino acids and humic acid and evenly stirring the mixture to obtain a mixed solution and (c) adding the mixed solution to hydrogen peroxide while stirring at 32 degrees C, stirring the mixture for 3-5 hours, filtering, cooling and air drying obtained product.