LIQUID FERTILISER WITH HIGH NITROGEN CONTENT Russian patent published in 2012 - IPC C05C9/00 C05C1/00 

FIELD: chemistry.

SUBSTANCE: invention relates to liquid fertiliser compositions having high nitrogen content. Aqueous solution of nitrogen fertiliser contains a mixture of urea-formaldehyde resin and a source of nitrogen fertiliser which is selected from a group consisting of urea, ammonium nitrate and a mixture of urea and ammonium nitrate, and has nitrogen content from 28 to 32 wt %. The urea-formaldehyde resin is obtained from reaction of urea, formaldehyde and ammonia in molar ratio formaldehyde/urea/ammonia equal to 1-4/1/0.5-1. The reaction takes place at temperature ranging from 80°C to 95°C and pH from 7.5 to 10.5. The reaction time ranges from 45 to 120 minutes. The urea-formaldehyde resin has cyclic urea content higher than 40 wt %, free urea less than 10 wt %, per 100% solid substance of the resin.

EFFECT: invention enables to obtain a liquid fertiliser composition with prolonged effect and high nitrogen content, which has a wide temperature range within which it remains liquid without marked precipitation of solid substances.

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