Homogeneous granular nitrogen fertilizer
First Claim
1. A homogeneous granulated fertilizer composition comprising as components about 90% to about 98% by weight urea, about 0.4% to 1.0% by weight ammonium thiosulfate and about 1.4% to about 3.0% by weight dicyandiamide, the foregoing components being in a homogeneous blend by said components being formed into granules from a melt of said urea component.
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Abstract
An improved aqueous nitrogen fertilizer has been developed that increases first-year nitrogen uptake efficiency to plants. It is also a nitrogen fertilizer with features to minimize exposure to nitrogen loss. It is a nitrogen fertilizer consisting of urea, dicyandiamide, ammonium thiosulfate, and optionally a phosphate compound which is preferably an ammonium phosphate compound. This composition can contain a dye and/or various mineral micronutrients. This homogeneous granular fertilizer can be applied to a field crop in a single application and is available to the growing plant throughout its growth and maturing cycle. The homogeneous granular fertilizer composition is conveniently prepared by the addition of a dicyandiamide, and a solution of ammonium thiosulfate to molten urea. A phosphate compound and preferably ammonium polyphosphate, would be added along with these components.
22 Citations
26 Claims
- 1. A homogeneous granulated fertilizer composition comprising as components about 90% to about 98% by weight urea, about 0.4% to 1.0% by weight ammonium thiosulfate and about 1.4% to about 3.0% by weight dicyandiamide, the foregoing components being in a homogeneous blend by said components being formed into granules from a melt of said urea component.
- 9. A method of enhancing the growth of plants by applying to the soil a homogeneous granulated fertilizer composition comprising about 90% to about 98% by weight urea, about 0.4% to about 1.0% by weight ammonium thiosulfate and about 1.4% to about 3.0% by weight dicyandiamide, the foregoing components being in a homogeneous blend by said components being formed into granules from a melt of said urea component.
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16. A method for producing a homogeneous granulated fertilizer composition comprising:
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(a) providing urea in a molten condition and adding dicyandiamide and ammonium thiosulfate to said molten urea; (b) removing at least some of the contained moisture from the molten urea containing dicyandiamide and ammonium thiosulfate dissolved therein; and (c) forming said molten urea containing dicyandiamide and ammonium thiosulfate dissolved therein into granules, wherein said fertilizer composition comprises about 90% to about 98% by weight urea, about 0.4% to about 1.0% by weight ammonium thiosulfate, and about 1.4% to about 3.0% by weight dicyandiamide. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification