Slow-Release Fertilizer and Method of Making and Using Same

a technology of nitrogen fertilizer and slow release, which is applied in the direction of nitrogenous fertilisers, biocides, herbicides and algicides, etc., can solve the problems of very rapid leaching of nutrients into and through the soil, and achieve the effect of reducing leaching of fertilizer and improving taste and quality

Inactive Publication Date: 2009-12-03
REGAL CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013]The present invention satisfies the above-described needs by providing a slow-release nitrogen fertilizer composition that improves plant, crop and turf growth. The fertilizer composition of the present invention comprises a water-insoluble slow-release nitrogen fertilizer and the water-soluble poly(amino acids), and salts thereof, disclosed in U.S. Pat. No. 5,350,735 (incorporated herein by reference), in an amount sufficient to increase the period of release of nitrogen from said water-insoluble slow-release nitrogen fertilizer and / or to improve the growth of plants, crops or turf and improved the yield of crops to which it is applied. The water-insoluble slow-release fertilizer is preferably a water-insoluble reacted nitrogen fertilizer, especially methylene urea (also known as urea formaldehyde) or isobutylidene diurea.
[0020]Another object of the present invention is to provide a slow-release nitrogen fertilizer that improves the growth of plants and turf and improved the yield of crops.
[0022]Yet another object of the present invention is to provide a slow-release nitrogen fertilizer that results in reduced leaching of the fertilizer into ground water, streams, rivers and the like.
[0023]Another object of the present invention is to provide a slow-release nitrogen fertilizer that produces crops with improved taste and quality.
[0024]Still another object of the present invention is to provide a slow-release nitrogen fertilizer that produces crops that have better storage properties; i.e., a longer shelf life.
[0025]A further object of the present invention is to provide a slow-release nitrogen fertilizer that produces crops that are more disease free or less disease to produce better quality fruit and vegetables.

Problems solved by technology

While water-soluble fertilizers are generally less expensive than slow-release fertilizers, they have the disadvantage of leaching nutrients very quickly into and through the soil.
However, tests with water-soluble forms of nitrogen in combination with poly(aspartic acid), or hydrolyzed forms of poly(aspartic acid), have not proven to sufficiently enhance plant growth so as to make the use of this composition economically feasible.

Method used

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  • Slow-Release Fertilizer and Method of Making and Using Same
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  • Slow-Release Fertilizer and Method of Making and Using Same

Examples

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Effect test

example 1

[0055]A liquid slow-release nitrogen fertilizer in accordance with the present invention is prepared as follows.

[0056]50 gallons of LiquiGreen® are added to a mixing tank. LiquiGreen® is a liquid urea formaldehyde fertilize that contains up to 32 percent nitrogen, up to 80 percent of which is water-insoluble, which is commercially available from Regal Chemical Company, Inc., Alpharetta, Ga. To the LiquiGreen® is added 6 quarts of sodium polyaspartate having a weight average molecular weight of 1,000 to 10,000. The desired mixture of various molecular weights is then blended at ambient temperature with a paddle blender, bypass agitation or an air system. The resulting blend is useful as a liquid slow-release reacted nitrogen fertilizer.

example 2

[0057]A solid slow-release nitrogen fertilizer in accordance with the present invention is prepared as follows.

[0058]100 pounds of solid urea formaldehyde are added to the hopper of a tumbling blender. 2-4 quarts of poly(amino acids) or salts thereof, such as, sodium polyaspartate are also added to the blender. The sodium polyaspartate is of one or more molecular weights of up to 10,000. The mixture is blended until the sodium polyaspartate is evenly distributed on the urea formaldehyde granules. The resulting blend is useful as a solid slow-release reacted nitrogen fertilizer.

example 3

[0059]A trial was conducted in a production field of “Savannah” mustard greens. The field was split using a standard nitrogen program of two applications of ammonium nitrate and a single pre-emergent application of Anchor™. Anchor™ is a mixture of 30% by weight liquid urea formaldehyde (66%-70% nitrogen of which 60%-70% by weight is water-insoluble) and 3% by weight sodium polyaspartate. All other fertilization was preformed in the same manner across the entire field. Tillage, planting and maintenance were done in accordance with normal production practices. Data was taken by harvesting paired samples from both the Anchor™ and the ammonium nitrate treated areas. The line between the two treatments was identified in the field. Samples were taken a few rows into the plots in order to avoid cross-contamination, but close enough that the paired samples were subjected to similar growing conditions. Applications were made using large-scale production equipment.

[0060]The treatments include...

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Abstract

There is disclosed a fertilizer composition comprising a water-insoluble slow-release reacted nitrogen fertilizer and an effective amount of a water-soluble, non-aromatic poly(amino acid) of the group poly(aspartic acid), poly(glutamic acid), poly(glycine), poly(lysine) a copolymer of cystein and glutamic acid and a terpolymer of cystein and glutamic acid and aspartic acid, wherein the poly(amino acid) has a molecular size larger than that which can be absorbed by a plant. A method of making and using the fertilizer composition is also disclosed.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]Applicants claim the benefit of provisional application Ser. No. 60 / 709,378 filed Aug. 18, 2005.FIELD OF THE INVENTION[0002]The present invention relates to slow-release nitrogen fertilizers. Specifically, the present invention relates to a fertilizer composition that releases nitrogen slowly for a full growing season and / or improves plant, crop and turf growth relative to slow-release nitrogen fertilizers of the prior art.BACKGROUND OF THE INVENTION[0003]Through the years, a variety of techniques have been developed for delivering nutrients to growing plants and for extending or delaying the release of nutrients from a fertilizer.[0004]Fertilizer is often applied as a formulated (N—P—K) solid, granule or powder, or sometimes as a liquid, to an area to be fertilized. There are basically two types of fertilizers, water-soluble fertilizers and “slow-release” fertilizers. While water-soluble fertilizers are generally less expensive than slow...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A01N25/26C05C9/00C05C9/02A01N33/00A01P21/00A01P3/00A01P13/00A01P7/04
CPCC05C9/00C05C9/02C05G3/0047C05G5/40Y02P60/21
Inventor KING, WILLIAM E.FISTER, RONALD P.NORRIS, STANLEY J.
Owner REGAL CHEM
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