1
Leon R Jones: Fertilizer composition and method of making same. Herbert E Haynes Jr, September 26, 1978: US04116664 (58 worldwide citation)

A method for controlled reaction of urea with sulfuric acid to form a liquid nitrogen sulfate fertilizer composition consisting of urea sulfate and liquified urea, and which may include other nutrients.


2
An Tung Thien Doan: Plant Fertilizer Composition and Method of Making Same. Baker & Hostetler, October 29, 2009: US20090266125-A1

The present invention provides, in some embodiments, a plant fertilizing composition and a method of producing the plant fertilizer. Other embodiments of the invention provide natural, organic, non-pathogenic enzymes for soil and water immobilization and microencapsulated bacterial enzymatic complex ...


3
Doan An Tung Thien: Plant fertilizer composition and method of making same. Doan An Tung Thien, GRAHAM Michael D, November 5, 2009: WO/2009/134712

The present invention provides, in some embodiments, a plant fertilizing composition and a method of producing the plant fertilizer. Other embodiments of the invention provide natural, organic, non-pathogenic enzymes for soil and water immobilization and microencapsulated bacterial enzymatic complex ...