NOVELTY - A biological fertilizer composition comprising yeast cell components, is new.    USE - The composition is useful for enhancing plant growth.    DETAILED DESCRIPTION - A biological fertilizer composition comprising at least one of the following yeast cell components:    (a) yeast cells (Ia) that fixate nitrogen;    (b) yeast cells (Ib) that decompose phosphorus compounds; and/or    (c) yeast cells (Ic) that decompose potassium compounds, is new.    INDEPENDENT CLAIMS are included for the following:    (1) activating or enhancing the ability of yeast cells to:    (a) fix atmospheric nitrogen comprising culturing the cells in the presence of an electromagnetic (EM) field having a frequency of 850-860 MHz and an amplitude of 1000-5000 mV;    (b) decompose phosphorus-containing minerals or compounds comprising culturing cells in the presence of an EM field of frequency 360-370 MHz and amplitude of 1000-5000 mV;    (c) to decompose potassium-containing minerals or compounds comprising culturing cells in the presence of an EM field of frequency 250-260 MHz and amplitude of 1000-5000 mV;    (d) to decompose high molecular weight carbon compounds comprising culturing cells (Id) in the presence of an EM field of frequency 1087-1097 MHz and amplitude of 1000-5000 mV;    (e) to overproduce growth factors comprising culturing cells (Ie) in the presence of an EM field of frequency 1382-1392 MHz and amplitude of 1000-2000 mV; and    (f) to overproduce adenosine triphosphate (ATP) comprising culturing cells (If) in the presence of an EM field of frequency 1690-1700 MHz and amplitude of 1000-5000 V;    (2) forming a symbiosis-like relationship among yeast cells comprising preparing a mixture of cells of type (Ia), (Ib), (Ic), (Id), (Ie) and (If) and culturing the mixture in the presence of an EM field having frequencies 860-870, 360-370, 250-260 and 1087-1097 and each frequency having an amplitude of 0-3000 mV;    (3) producing the composition comprising mixing yeast cell components (Ia)-(If) and adding to the mixture organic substrate component and inorganic substrate component; and    (4) enhancing plant growth comprising application of the composition.