Novel formulation of phosphorus fertilizer for plants

• US 20050178178A1
• Filed: 03/10/2005
• Published: 08/18/2005
• Est. Priority Date: 02/07/1994
• Status: Active Grant

• Current Assignee: Regents of the University of California (University of California)
• Original Assignee: Regents of the University of California (University of California)
• Inventors: Lovatt, Carol J.
• Granted Patent: US 7,160,350 B2
• Time in Patent Office: Days
• US Class Current: 71/31
• CPC Class Codes: C05B 13/02 from rock phosphates C05B13/06 takes precedence
• CPC Class Codes: C05B 17/00 Other phosphatic fertilisers, e.g. soft rock phosphates, bone meal
• CPC Class Codes: C05B 7/00 Fertilisers based essentially on alkali or ammonium orthophosphates C05B11/00 takes precedence
• CPC Class Codes: C05F 11/00 Other organic fertilisers
• CPC Class Codes: C05G 5/23 Solutions

Abstract

Concentrated phosphorus fertilizers are disclosed that comprise a buffered composition of an organic acid and salts thereof and a phosphorous-containing acid and salts thereof. The concentrated phosphorus fertilizers can be diluted with water of pH ranging from about 6.5 to about 8.5 at ratios of concentrate to water at about 1:40 to about 1:600 to result in a fertilizer having a pH in the range acceptable for foliar uptake of phosphorus.

Claims

1-24. -24. (canceled)

25. A multiple buffered phosphorus fertilizer comprising:

(i) a first buffer system comprising a phosphorous acid and a salt of a phosphorous acid; and

(ii) a second buffer system comprising an organic acid and a salt of an organic acid.

26. The multiple buffered phosphorus fertilizer according to claim 25, wherein phosphorus in said multiple buffered phosphorus fertilizer is present in an amount equivalent to about 0.30 kg/L or greater P₂O₅.

27. The multiple buffered phosphorus fertilizer according to claim 25, wherein said organic acid is a member selected from dicarboxylic acids, tricarboxylic acids and combinations thereof.

28. The multiple buffered phosphorus fertilizer according to claim 27, wherein said organic acid is citric acid.

29. The multiple buffered phosphorus fertilizer according to claim 25, wherein said phosphorous acid is a member selected from phosphorous acid, hypophosphorous acid, polyphosphorous acid, polyhypophosphorous acid and combinations thereof.

30. The multiple buffered phosphorus fertilizer according to claim 25, wherein said fertilizer has a pH of about 5.0 to about 7.0.

31. The multiple buffered phosphorus fertilizer according to claim 30, wherein said fertilizer has a pH of about 5.5 to about 6.5.

32. The multiple buffered phosphorus fertilizer according to claim 25, wherein the number of buffering systems is two.

33. A substantially fully solubilized use-dilution fertilizer having a pH acceptable for foliage uptake of phosphorus, said use-dilution fertilizer comprising:

(i) the multiple buffered phosphorus fertilizer according to claim 25;

and

(ii) water.

34. The use-dilution fertilizer according to claim 33, wherein said use-dilution fertilizer comprises a ratio of said multiple buffered phosphorus fertilizer to said water of about 1:

40 to about 1;

600.

35. The use-dilution fertilizer according to claim 33, wherein said water has a pH of about 6.5 to about 8.5.

36. The multiple buffered phosphorus fertilizer according to claim 25, wherein said multiple buffered phosphorus fertilizer is essentially clear and devoid of precipitate.

37. The multiple buffered phosphorus fertilizer according to claim 25, further comprising a plant nutrient, wherein said plant nutrient is a member selected from nitrogen, potassium, sulfur, calcium, magnesium, boron, iron, manganese, molybdenum, zinc, ammonia and combinations thereof.

38. The multiple buffered phosphorus fertilizer according to claim 25, wherein said multiple buffered phosphorus fertilizer is in a liquid form.

39. The multiple buffered phosphorus fertilizer according to claim 25, wherein said multiple buffered phosphorus fertilizer is in a solid form.

40. The multiple buffered phosphorus fertilizer of claim 25, wherein phosphorus in said multiple buffered phosphorus fertilizer is present in an amount equivalent to from about 0.30 kg/L to about 0.40 kg/L P₂O₅.