Chemistry: fertilizers – Processes and products – Forms or conditioning
Patent
1982-12-27
1985-06-11
Mills, Catherine L.
Chemistry: fertilizers
Processes and products
Forms or conditioning
71 83, A01N 5900
Patent
active
045226440
ABSTRACT:
Methods for controlling parasitic plant suckers growing from desired vegetation are disclosed which involve selectively contacting the foliage of the plant sucker with an aqueous solution containing a urea-sulfuric acid component which is a reaction product of urea and sulfuric acid, and avoiding contact of the remaining foliage of the desired vegetation with the aqueous solution. The molar ratio of urea to sulfuric acid in the urea-sulfuric acid component is preferably within the range of about 1/4 to about 7/4, and preferably at least about 25 percent of the sulfuric acid in the urea-sulfuric acid component is present as the monourea adduct of sulfuric acid. The aqueous solution may also contain an amount of a surfactant sufficient to increase the wetting ability of the solution for the foliage of the plant sucker to accentuate the herbicidal activity of the solution toward the plant sucker.
REFERENCES:
patent: 1340708 (1920-05-01), Fjellanger
patent: 4116664 (1978-09-01), Jones
patent: 4318343 (1982-01-01), Verdegaal et al.
D. F. du Toit, Verslag Akad. Wetenschappen, 22, 573-4 (abstracted in Chemical Abstracts, 8, 2346, 1914).
L. H. Dalman, "Ternary Systems of Urea and Acids I, Urea, Nitric Acid and Water II, Urea, Sulfuric Acid and Water III, Urea, Oxalic Acid and Water"; JACS, 56, 549-53 (1934).
Sulfur Institute Bulletin No. 10 (1964) "Adding Plant Nutrient Sulfur to Fertilizers".
Laird Michael H.
Mills Catherine L.
Sandford Dean
Union Oil Company of California
Wirzbicki Gregory F.
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