NOVELTY - Liquid fertilizer comprises 38-42 pts. wt. rapeseed straw charcoal powder, 6-8 pts. wt. whey powder, 5-7 pts. wt. potassium pyrophosphate, 9-13 pts. wt. triple superphosphate, 55-65 pts. wt. rice bran, 40-46 pts. wt. vinegar, 90-110 pts. wt. waste of livestock and poultry feather, 4-5 pts. wt. copper sulfate, 6-7 pts. wt. ferrous sulfate, 5-6 pts. wt. genetically modified (GM) microorganism formulation and water (suitable quantity).    USE - The heat preserving liquid fertilizer is useful for strengthening crop root growth.    ADVANTAGE - The heat preserving liquid fertilizer increases organic colloid content, adsorption surface area, soil water and nutrient retention activity, and buffering capacity, suitable for long-term use, forms stable aggregate structure and cemented soil particle, has high content of humus, and reduces day and night temperature.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for method for preparing liquid fertilizer, which involves (a) washing waste of livestock and poultry feather, drying and crushing washed waste of livestock and poultry feather into two portions, adding 10 times 3 mol/l sulfur acid solution, hydrolyzing the mixture for 220-260 minutes in microwave oven, adding 10 times 6 mol/l potassium hydroxide solution, and hydrolyzing the mixture again for 270-290 minutes, (b) uniformly mixing the hydrolyzed liquids, filtering the hydrolyzed liquid to obtain hydrolyzed liquid and organic residue, adding whey powder, and copper sulfate to hydrolyzed liquid, regulating pH 6, heating the mixture at 50-60 degrees C for 70-90 minutes, adding ferrous sulfate, and increasing the temperature to 65-75 degrees C for 40-60 minutes to obtain complex amino acid chelate liquid, (c) adding rapeseed straw charcoal powder, rice bran, and vinegar to the organic residue obtained in step (b), placing the mixture in fermentation pool, adding suitable quantity of water to the mixture until water content is 40-45%, and fermenting the compost for 30-50 days, (d) adding 8-10 times water and GM microorganism formulation to the fermented compost, uniformly stirring the mixture, placing the stirred mixture in an air container for 24-30 hours, continuously stirring the mixture, and filtering the processed mixture using double layer yarn cloth filter to obtain extract liquid, and (e) uniformly mixing the complex amino acid chelate liquid obtained in step (b), compost extract liquid obtained in step (d), potassium pyrophosphate, triple superphosphate and remaining material, placing the fertilizer liquid in magnetization machine at below 480-520 mT for 8-12 minutes to obtain liquid fertilizer.