Methods for the production of a solid urea-thiosulfate fertilizer

A method for the production of a solid urea-thiosulfate fertilizer, said method comprising the following steps:

• (i) providing a first liquid composition comprising urea;
• (ii) providing a second composition comprising a thiosulfate salt;
• (iii) combining the composition provided in step (i) with the composition provided in step (ii) to obtain a liquid urea-thiosulfate blend comprising 70-90 wt. % (by dry weight of the urea-thiosulfate blend) urea and 10-30 wt. % (by dry weight of the urea-thiosulfate blend) thiosulfate salt;
• (iv) optionally submitting the liquid urea-thiosulfate blend of step (iii) to a concentration step to obtain a concentrated liquid urea-thiosulfate blend;
• and
• (v) feeding the liquid urea-thiosulfate blend of step (iii) and/or the concentrated liquid urea-thiosulfate blend of step (iv) as a liquid at a temperature of less than 128° C. to a solidification section wherein the liquid is converted to a particulate solid, thereby obtaining the solid urea-thiosulfate fertilizer.