Herbicide compatibility improvement
A herbicidal composition comprises an aqueous solution of a plurality of salts of glyphosate wherein said glyphosate is in anionic form accompanied by low molecular weight non-amphiphilic cations, wherein a major amount but less than 100% of the low molecular weight non-amphiphilic cations are potassium cations, and wherein the composition has a measured pH of at least about 4.8.
1. A method for improving compatibility of
(i) a first aqueous concentrate herbicidal composition that comprises one to a plurality of salts of glyphosate at a total glyphosate a.e. concentration not less than about 360 g/l, wherein (a) the 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 glyphosate; and (b) a major amount to substantially all of the low molecular weight non-amphiphilic cations are potassium cations; and
(ii) a second aqueous concentrate herbicidal composition that comprises one to a plurality of salts of a phenoxy-type herbicide
when admixed with water to form a tank-mix composition, the method comprising adding a base in an amount sufficient to raise pH of the tank-mix composition to at least about 4.8.
2. The method of claim 1 , wherein the base is added at least in part to the first aqueous concentrate composition.
3. The method of claim 1 , wherein the base is added at least in part to the second aqueous concentrate composition.
4. The method of claim 1 , wherein the base is added at least in part during preparation of the tank-mix composition.
5. The method of claim 1 , wherein the base is selected from the group consisting of sodium hydroxide, potassium hydroxide, aluminum hydroxide, ammonia, sodium bicarbonate, ammonium bicarbonate and mixtures thereof.
6. The method of claim 1 , wherein the phenoxy-type herbicide is selected form the group consisting of 2,4-D, dicamba and picloram.
7. The method of claim 1 , wherein the phenoxy-type herbicide salt is the dimethylammonium salt of 2,4-D.
8. The method of claim 1 , wherein the improved compatibility is exhibited at a glyphosate/phenoxy-type herbicide a.e. ratio of about 1:5 to about 20:1.
9. The method of claim 1 , wherein the major amount of potassium ions is less than 100% of the low molecular weight non-amphiphilic cations.
10. The method of claim 1 , having a total glyphosate a.e. concentration of about 360 to about 650 g/l.
11. The method of claim 1 , having a total glyphosate a.e. concentration of about 400 to about 600 g/l.
12. A method for redissolving a precipitate that forms when an aqueous concentrate glyphosate potassium salt composition and an aqueous concentrate phenoxy-type herbicide salt composition are admixed with water to form a tank-mix composition, the method comprising adding a base in an amount sufficient to redissolve the precipitate.