Granular urea-based fertilizer
First Claim
1. A homogenous granular fertilizer composition comprising as components urea, N-(n-butyl) thiophosphoric triamide, and dicyandiamide, wherein said urea is present in an amount between about 90% and about 99% by weight, said N-(n-butyl) thiophosphoric triamide is present in an amount between about 0.02% and about 0.5% by weight, and said dicyandiamide is present in an amount of about 0.01% to about 1.2% by weight.
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Abstract
An improved homogenous granular fertilizer composition is disclosed; the composition is comprised primarily of urea, N-(n-butyl)thiophosphoric triamide (NBPT), and dicyandiamide (DCD). The composition of this invention can be applied to a field crop in a single surface application and will nevertheless supply sufficient nitrogen to the plants throughout their growth and maturing cycles. The new improved composition increases the nitrogen uptake by plants, enhances crop yields, and minimizes the loss of both ammonium nitrogen and nitrate nitrogen from the soil.
The NBPT is incorporated into the homogenous granular fertilizer composition of this invention by blending a concentrated solution of NBPT in a solvent selected from the group consisting of liquid amides, 2-pyrrolidone, and N-alkyl 2-pyrrolidones directly into molten urea prior to its granulation; the DCD may be added to the urea melt as a solid or in dissolved form along with the NBPT.
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23 Claims
- 1. A homogenous granular fertilizer composition comprising as components urea, N-(n-butyl) thiophosphoric triamide, and dicyandiamide, wherein said urea is present in an amount between about 90% and about 99% by weight, said N-(n-butyl) thiophosphoric triamide is present in an amount between about 0.02% and about 0.5% by weight, and said dicyandiamide is present in an amount of about 0.01% to about 1.2% by weight.
- 12. A method of enhancing the growth of plants by applying to the soil a homogeneous granular fertilizer composition comprising as components urea, N-(n-butyl) thiophosphoric triamide, and dicyandiamide, wherein said urea is present in an amount between about 90% and about 99% by weight, said N-(n-butyl) thiophosphoric triamide is present in an amount between about 0.02% and about 0.5% by weight, and said dicyandiamide is present in an amount of about 0.01% to about 1.2% by weight.
- 17. A method for producing a homogeneous granular fertilizer composition comprising providing urea in molten condition and adding dicyandiamide an da concentrated solution of N-(n-butyl) thiophosphoric triamide in a solvent selected from the group consisting of liquid amides having the formula R1 CONR2 R3, wherein R1 is a hydrogen atom or an alkyl group having 1 to 4 carbon atoms and wherein R2 and R3 are independently hydrogen atoms, alkyl groups or phenyl groups, 2-pyrrolidone, and N-alkyl 2-pyrrolidones wherein the alkyl group ranges in size from one to twelve carbon atoms, and b) forming said molten urea from step (a) containing dicyandiamide and N-(n-butyl)thiophosphoric triamide dissolved therein into granules, wherein said urea is present in an amount between about 90% and about 99% by weight, said N-(n-butyl) thiophosphoric triamide is present in an amount between about 0.02% and about 0.5% by weight, and said dicyandiamide is present in an amount of about 0.01% to about 1.2% by weight.
Specification