NOVELTY - Fertilizer comprises mother liquor obtained by adding Bacillus to biogas residues, flocculating obtained mixture, centrifuging obtained product, and recovering supernatant. The mother liquor further comprises urea, sucrose, potassium dihydrogen phosphate, magnesium sulfate, borax, manganese sulfate, ferrous sulfate, zinc sulfate, 0.03- copper sulfate, hydrated potassium aluminium sulfate, 6-benzylaminopurine, sodium alginate and chitin.    USE - As fertilizer for flowers (claimed).    ADVANTAGE - The fertilizer contains balanced amount of nutrients, and enables to create low osmotic pressure in soil.    DETAILED DESCRIPTION - Fertilizer comprises mother liquor, where the mother liquor is obtained by adding 1 vol.% Bacillus to biogas residues, flocculating the mixture, centrifuging obtained product, and recovering supernatant. The mother liquor further comprises 0.3-6 g/l urea, 0.2-15 g/l sucrose, 0.2-3 g/l potassium dihydrogen phosphate, 0.1-3 g/l magnesium sulfate, 0.2-3 g/l borax, 0.01-0.8 g/l manganese sulfate, 0.1-3 g/l ferrous sulfate, 0.5-1 g/l zinc sulfate, 0.03-0.4 g/l copper sulfate, 0.03-0.6 g/l hydrated potassium aluminium sulfate, 0.002-0.05 g/l 6-benzylaminopurine, 0.015-0.02 g/l sodium alginate and 0.002-0.5 g/l chitin. An INDEPENDENT CLAIM is included for method for preparing the fertilizer, which involves (a) adding Bacillus to biogas residues, allowing the mixture to stand for 24 hours, flocculating the mixture, centrifuging obtained product, and recovering supernatant, where the Bacillus has total bacterial count of more than 1 billion/ml (b) adding urea, sucrose, 0.2-4 g/l potassium dihydrogen phosphate, magnesium sulfate, borax, manganese sulfate, ferrous sulfate, zinc sulfate, copper sulfate, alum and 0.2-3 g/l calcium dihydrogen phosphate to the mixture, stirring the mixture uniformly, and allowing the mixture to stand at 4 plus minus 1 degrees C for 12 hours, (c) adding 6-benzylaminopurine, sodium alginate and chitin to the mixture obtained in the step (b), and stirring the mixture uniformly, and (d) adding the mixture obtained in the step (c) to flower extracts of marigold, orchids, rose, peony or lavender by steam distillation in ratio of 1:5000-10000, allowing the mixture to stand for 4 hours, and adjusting pH of obtained product to 5.5-7.5.