A prilling method comprising the steps of: providing a molten first component, mixing at least a second component with the molten first component, reacting the components to form a shear-thinnable mixture; and prilling the shearthinnable mixture wherein the prilling comprises mechanically agitating in the prill head to shear thin the shearthinnable mixture sufficiently to permit prilling. The inventive method can he used to produce fertilizer product comprising annnonium sulfate nitrate.