Fuente: WIPO "organic farming" A method for producing a liquid nitrogen fertilizer from protein-rich plant materials, such as soybeans. The method includes extracting nitrogenous compounds through an alkaline solution under controlled temperature and pH conditions, followed by enzymatic hydrolysis using proteases to break down proteins into amino acids and oligopeptides. The fertilizer composition may include additional plant-beneficial compounds, such as isoflavones, phenols, and phytoalexins, enhancing plant growth, nutrient uptake, and disease resistance. The method maximizes recovery through iterative mechanical separation and optional hydrolysis of solid fractions. The resulting organic liquid fertilizer is suitable for use in sustainable and organic farming applications, providing a nutrient-rich, environmentally friendly alternative to conventional chemical fertilizers.