| abstract |
The present invention relates to a method for the preparation of a liquid fertilizer from organic industrial wastes. The method comprises introducing the organic industrial wastes into a humic substance-extracting apparatus; adding a 0.01 N to 1.00 N alkaline solution to the organic industrial wastes; stirring the resulting mixture at a temperature of 50 to 120 ¡ÆC while extracting a humic substance useful as a fertilizer; and adding to the humic substance, microelements such as iron (Fe), copper (Cu), manganese (Mn), molybdenum (Mn) and boron (B), and plant nutrients such as nitrogen (N), phosphorus (P) and potassium (K). The liquid fertilizer prepared according to the method improves soil quality and increases crop growth. |