A review with 30 refs. covering preparation of multicomponent fertilizers (N-P-K containing Mg, Na, S, and microelements) by chemical reactions of phosphates, (NH4)(2)SO4 (1), CO(NH2)(2), K(Cl and/or SO4) (II), and magnesite (III) with H 20 (or a post-absorption liquor) in a reactor and/or granulator, to yield H2O-soluble or assimilable phosphates and so as to avoid oxidation of organics, evolution of gases, and reversion of superphosphate(s) (IV). Polish processes are reviewed including (I) granulation (1-6 mm) of I through IV and microelement salts with H2O (or post-absorption liquor (V)), drying to leave 4% H2O only, sieving, and cooling to 313 K; (H) nonthermal granulation of conventional IV (industrial trials to make N-P-K-Mg, P-K-Mg, and N-P-Mg involved exothermic reactions raising the temperature up to 473 K) to yield polyphosphates and anhydrous salts to be hydrolyzed in a granulator to yield phosphates and hydrous salts; (111) spontaneous drying and cementation of Mg-containing IV; (iv) granulation (0.2-0.5 mm) with H2O (or V) of mixtures containing phosphate, undersize, fillers, H2SO4, NH4OH, H2O and V; (v) modified TVA (Fig. 1), Dorr-Oliver (Fig. 2), and Grand-Paroisse urea-IV (verified commercially) processes; conversion of KCl with Na or NH4 salts to yield low-Cl N-P-K, e.g., (K, NH4)H2PO4 or (K, NH4)H2PO4-(K, NH4)(2)SO4, KH2PO4 or KH2PO4-K3Na(SO4)(2). Bulk blending requires the fertilizers to be mixed together to meet many requirements, but it offers no phosphogypsum waste and Is more environment-friendly. To reduce the fertilizer Industry Impact, it Is advised to decompose phosphorites partially with only 30-35% of the acids used so far to make IV, to activate P ores on wet-milling; to convert P raw materials biochemically; to recover fertilizer ingredients from waste products; to use double or triple conversion to make H2SO4, high pressure to make HNO3, and tubular reactors to make NH4 phosphates; to collect dust; to remove contaminants from Inevitable off-gases; and to recycle dust and V.