NOVELTY - A biological fertilizer composition (I) comprising an organic substrate, at least one yeast cell which fixes nitrogen or decomposes phosphorus or potassium compounds and at least one yeast cell which suppresses the growth of pathogenic microorganisms, degrades antibiotics or reduces the odor of the biological fertilizer composition, is new.    USE - (I) is useful for enhancing plant growth by applying to soil at the depth of the major root system of the plant selected from cereal crop, vegetable crop, fruit crop, flower crop, or grass crops (preferably wheat, barley, com, soybean, rice, oat, potato, apple, orange, tomato, melon, cherry, lemon, lettuce, carrot, sugar cane, tobacco, or cotton) (all claimed).    ADVANTAGE - The biological fertilizer composition of yeast cell component (b) is capable of maintaining a balance of phosphorus compounds. The biological fertilizer provides an economically acceptable and recycled by economic methods. The fertilizer composition has utility in any kind of agriculture, horticulture and forestry practices. The biological fertilizer composition can be used for large-scale commercial farming, in open fields or in greenhouse, or even in interiors for decorative plants.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for:    (1) a biological fertilizer comprising an organic substrate, at least one:    (a) first yeast cell component prepared by culturing a number yeast cells in an electromagnetic field having a frequency of 840 - 916 MHz and a field strength of 10 - 200 mV/cm;    (b) a second yeast cell component prepared by culturing a second several yeast cells in an electromagnetic field having a frequency of 300 - 500 MHz (preferably 380 - 465) and a field strength of 10 - 300 (preferably 90 - 300) mV/cm;    (c) a third yeast cell component prepared by culturing a third several yeast cells in an electromagnetic field having a frequency of 190 - 285 MHz and a field strength of 10 - 200 mV/cm; and at least one    (d) a fourth yeast cell component prepared by culturing a fourth several yeast cells in an electromagnetic field having a frequency of 30 - 50 MHz and a field strength of 20 - 200 mV/cm;    (e) a fifth yeast cell component prepared by culturing a fifth several yeast cells in an electromagnetic field having a frequency of 70 - 100 MHz and a field strength of 40 - 250 mV/cm; and    (f) a sixth yeast cell component prepared by culturing a sixth several yeast cells in an electromagnetic field having a frequency of 2160 - 2250 MHz and 2280 - 2380 MHz and a field strength of 100 - 300 mV/cm; and    (2) production of the biological fertilizer composition involving:    (i) preparing a mixture of yeast cells by mixing at least one yeast cell component (a), (b), or (c) with at least one yeast cell component (d), (e), or (f); and    (ii) adding an organic substrate to the mixture of yeast cells to form the biological fertilizer composition.