Microbial culture medium and cultural method

A fermentation medium for algae comprising

• a combination of strong acid-weak alkali salts and strong alkali-weak acid salts, wherein said strong acid-weak alkali salts are selected from ammonium nitrate, ammonium sulfate, ammonium chloride and ammonium oxalate or a mixture of at least two thereof in an amount of 3 to 5 g/L;
• and said strong alkali-weak acid salts are sodium, potassium or calcium salts of glutamic acid, aspartic acid, lysine, arginine, histidine, glycine, serine, threonine, cysteine, tyrosine, alanine, valine, leucine, isoleucine, auxiliary leucine, phenylalanine, tryptophan, methionine or a mixture of at least two thereof in an amount of 5 to 20 g/L, and further comprising 10 to 200 g/L of glucose, 5 to 20 g/L of yeast cream, 0.1 to 35 g/L of inorganic salts, 10 to 30 ppm of vitamin B1, 5 to 15 ppm of vitamin B6, 1 to 5 ppm of vitamin B 12, 1 to 5 ppm of vitamin H, and 3 to 15 ppm of 6-benzyl amino adenine.