A microbial fertiliser comprises a granule comprising: (a) a central rock phosphate core (A) contg. a phosphate rock decomposing bacterium; (b) an intermediate layer (B) comprising a carbonaceous material and a source of starch and contg. a nitrogen-fixing bacterium, a carbon-waste decomposing bacterium, a rock potassium decomposing bacterium, a growth factor-producing yeast and an energy-producing yeast and (c) an outer film (C) sufficient to limit the passage of oxygen into the granule. Also claimed are: (1) a microbial fertiliser comprising: (i) a nitrogen-fixing bacterium; (ii) a carbon-waste decomposing bacterium; (iii) a phosphate rock decomposing bacterium and (iv) a rock potassium decomposing bacterium, where (i) - (iv) bacteria produce reduced N, C, phosphate and K nutrients, respectively, in amts. that augment the growth of plants, and where the bacterium are Streptomyces jingyangensis contg. DNA from: (a) Alcaligenes faecalis, (b) Polyangium cellulosum, (c) Bacillus megaterium phosphaticum or (d) Bacillus mucilagneosus var. Krassilnikov; all deposited as components of ATCC 55597; (2) a microbial fertiliser comprising (1) (i) - (iv) and additionally (v) a living growth factor producing yeast; and (vi) a living energy producing yeast, where (i) - (iv) produce reduced N, C, phosphate and K nutrients, respectively in amts. to augment plant growth and where the fertiliser is ATCC 55597; (3) mfr. of a central rock phosphate core (A) comprising: (a) grinding rock phosphate to 200 mesh; (b) combining the ground rock phosphate with a source of starch fermented by a growth factor producing yeast, and with a rock phosphate decomposing bacterium to form a mixt. of the ground rock phosphate, the fermented starch source and the bacterium, and (c) drying the mixt. and forming into granules; (4) mfr. of the intermediate layer (B) comprising: (a) grinding weathered coal or coal-mine waste to 200 mesh; (b) combining prod. from (a) with starch source, growth factor producing yeast, energy producing yeast, N-fixing bacterium, C-waste decomposing bacterium and K rock decomposing bacterium to form a mixt.; and (c) drying and forming into layer around granules of (A); and (5) mfr. of outer film (C) by spraying an aq. soln. onto the surface of (B).    The growth factor producing yeast is Saccharomyces diastaticus of ATCC 55597. The energy producing yeast is Saccharomyces sinenses Yue of ATCC 55597.    USE -   The microbial fertiliser is applied to soil to augment crop yields of cereal, fruit, vegetables and grass.    ADVANTAGE -   The microbial fertiliser constitutes a symbiotic association of several recombinant microbial species. The fertiliser can fix atmospheric N2 and organify phosphate and K so these nutrients can be used by plants. The fertiliser is avirulent, non-toxic and non-polluting.