Herbicide compatibility improvement
A herbicidal composition comprises an aqueous solution of one to a plurality of salts of glyphosate at a total glyphosate a.e. concentration not less than about 360 g/l, wherein (a) said glyphosate is in anionic form accompanied by low molecular weight non-amphiphilic cations in a total molar amount of about 110% to about 120% of the molar amount of said glyphosate; and (b) a major amount to substantially all of the low molecular weight non-amphiphilic cations are potassium cations. The composition exhibits improved tank-mix compatibility with a phenoxy-type herbicide salt formulation by comparison with an otherwise similar composition having a lower molar amount of said low molecular weight non-amphiphilic cations.
1. A herbicidal composition comprising an aqueous solution of a plurality of salts of glyphosate at a total glyphosate a.e. concentration not less than about 360 g/l, wherein (a) said glyphosate is in anionic form accompanied by low molecular weight non-amphiphilic cations in a total molar amount greater than 110% to a maximum of about 120% of the molar amount of said glyphosate; and (b) a major amount but less than 100% of the low molecular weight non-amphiphilic cations are potassium cations.
2. The composition of claim 1 , having a total glyphosate a.e. concentration of about 360 to about 650 g/l.
3. The composition of claim 1 , having a total glyphosate a.e. concentration of about 400 to about 600 g/l.
4. The composition of claim 1 , wherein the balance to 100% of the low molecular weight non-amphiphilic cations is provided in part or in whole by low molecular weight organic ammonium cations.
5. The composition of claim 4 , having a mole ratio of potassium to low molecular weight organic ammonium cations of about 55:45 to about 99:1.
6. The composition of claim 4 , having a mole ratio of potassium to low molecular weight organic ammonium cations of about 70:30 to about 90:10.
7. The composition of claim 4 , having a mole ratio of potassium to low molecular weight organic ammonium cations of about 96:4 to about 98:2.
8. The composition of claim 4 , wherein said low molecular weight organic ammonium cations comprise isopropylammonium cations.
9. The composition of claim 1 , having a measured pH of about 4.8 to about 5.
10. The composition of claim 1 , comprising no more than a pH adjusting amount of low molecular weight organic ammonium cations.
11. The composition of claim 1 , further comprising at least one surfactant.
12. The composition of claim 11 , wherein the weight ratio of glyphosate a.e. to total surfactant is not greater than about 10:1.
13. The composition of claim 1 , exhibiting improved tank-mix compatibility with a phenoxy-type herbicide salt formulation.
14. The composition of claim 13 , wherein said improved compatibility is evidenced at least by a reduced tendency to form a solid precipitate or an increase in the time period needed for such a precipitate to form after preparation of the tank-mix.
15. The composition of claim 13 , wherein the phenoxy-type herbicide is selected from the group consisting of phenoxyacetic acids, phenoxypropanoic acids, phenoxybutanoic acids, benzoic acids, picolinic acids and pyridinyloxyacetic acids.
16. The composition of claim 13 , wherein the phenoxy-type herbicide is selected from the group consisting of 2,4-D, dicamba and picloram.
17. The composition of claim 13 , wherein the phenoxy-type herbicide salt is a potassium, sodium, ammonium or organic ammonium salt.
18. The composition of claim 13 , wherein the phenoxy-type herbicide salt is selected from the group consisting of methylammonium, dimethylammonium, n-propylammonium, isopropylammonium, mono-, di- and triethanolammonium salts.
19. The composition of claim 13 , wherein the phenoxy-type herbicide salt is the dimethylammonium salt of 2,4-D.
20. The composition of claim 13 , wherein said improved compatibility is exhibited at a glyphosate/phenoxy-type herbicide a.e. ratio of about 1:5 to about 20:1.
21. The composition of claim 1 , wherein the total molar amount of said low molecular weight non-amphiphilic cations is about 112% to about 120% of the molar amount of said glyphosate.