Urea-Formaldehyde Plant Nutrient Solution Containing High Levels of Slow Release Nitrogen

A one-stage process of preparing a plant nutrition solution containing at least about 40 wt % of triazone for slowly releasing nitrogen, the process comprising:

• (i) forming a reaction mixture by combining water, urea, formalin, and a sufficient amount of potassium hydroxide to maintain a pH greater than 7 to about 9.5, while maintaining a temperature of from about 45° C. to about 50° C.;
• (ii) adding to said reaction mixture aqua ammonia while heating the reaction mixture, if needed, to maintain a temperature of about 90° C. to about 95° C.;
• (iii) sequentially adding to said reaction mixture at least three additional portions of potassium hydroxide under conditions sufficient to form an aqueous product solution containing at least one triazone compound;
• and
• (iv) recovering the product, wherein the product solution contains at least about 40 wt % of said at least one triazone compound.