FIELD: chemistry.
SUBSTANCE: invention relates to agriculture. A micro-colloidal silicic acid / boric acid composition comprises an acidified aqueous solution of (1) micro colloidal silicic acid, (2) boric acid, and (3) a water absorbing additive. The composition has a pH value of equal to or less than 1. The water absorbing additive concentration is at least 30% of the composition. The micro colloidal silicic acid has particle sizes in the range of 1-8 nm. A particulate product, wherein the particles comprise (1) silicic acid, (2) boric acid, and (3) the water absorbing additive, and wherein at least 90% of the particles in the particulate product have particle sizes in the range of 0.3-5 mcm. A method of preparing a composition, comprising (a) providing a first mixture of a water absorbing additive and an acidified aqueous liquid, (b) providing a second mixture of a silicon source and an aqueous liquid, (c) mixing in a mixing process at a temperature in the range of >10°C and <35°C the first mixture and the second mixture. The method further comprises adding a boron source to the stock solution.
EFFECT: invention makes it possible to provide stable solutions.
25 cl, 14 ex
