High-strength, herbicidal compositions of glyphosate and 2,4-D salts
The mixture of certain amine salts of glyphosate and 2,4-D allows the preparation of high-strength liquid compositions containing up to greater than 450 gae/L of total active ingredient loading if the pH is adjusted to about 6.0 to about 8.0. Compositions are particularly well-suited for application to crops that are resistant or tolerant to both glyphosate and 2,4-D.
1. A homogeneous, stable, high-strength aqueous herbicidal concentrate composition comprising:
(a) water,
(b) a glyphosate amine salt, and
(c) a 2,4-D choline salt,
in which (i) the glyphosate amine salt is a primary, secondary, tertiary or quaternary alkylamine, alkanolamine or alkylalkanolamine salts is choline, wherein the alkyl and alkanol groups are saturated and contain from C 1 -C 3 carbon atoms individually, with the proviso that no more than one of the amine salts in the composition is a primary amine salt, (ii) the concentrate composition contains a total active ingredient loading of at least 350 gae/L of the glyphosate amine salt and the 2,4-D choline salt, (iii) the weight ratio of the glyphosate amine salt to the 2,4-D choline salt of the concentrate composition is from 1:2.3 to 2.3:1, (iv) the pH of the concentrate composition is from 6.0 to 8.0; and (v) does not exhibit separation or precipitation at a temperature below about 0° C.
2. The concentrate composition of claim 1 , wherein the total active ingredient loading is greater than 450 grams of acid equivalent/L of the glyphosate amine salt and the 2,4-D choline salt.
3. The concentrate composition of claim 1 , wherein the weight ratio of the glyphosate amine salt to the 2,4-D choline salt is 1:1.
4. The concentrate composition of claim 1 , wherein the pH is from 6.5 to 7.5.
5. The concentrate composition of claim 1 , further comprising between 20 g/L and 200 g/L of at least one cosolvent.
6. The concentrate composition of claim 1 , further comprising at least one efficacy enhancing surfactant in an amount between 20 g/L and 200 g/L.
7. A method of controlling undesirable vegetation in crops that are resistant or tolerant to both glyphosate and 2,4-D which comprises applying to the undesirable vegetation and the crops that are resistant or tolerant to both glyphosate and 2,4-D a water-diluted composition of the concentrate composition of claim 1 .
8. The composition of claim 1 , wherein the composition contains a 2,4-D loading of at least 228 gae/L.
9. The concentrate composition of claim 1 , wherein the composition contains a glyphosate loading of at least 228 gae/L.
10. The concentrate composition of claim 8 , wherein the composition contains a 2,4-D loading of at least 240 gae/L.
11. The concentrate composition of claim 9 , wherein the composition contains a glyphosate loading of at least 240 gae/L.
12. The concentrate composition of claim 11 , wherein the composition contains a 2,4-D loading of at least 228 gae/L.
13. The concentrate composition of claim 10 , wherein the composition contains a glyphosate loading of at least 228 gae/L.
14. The concentrate composition of claim 1 , wherein the composition has no phase separation or crystal formation for at least two weeks and is a free-flowing liquid at temperatures from 54° C. to −10° C.
15. The concentrate composition of claim 1 , wherein the composition i) forms a clear homogeneous solution, has no phase separation or crystal formation for at least two weeks and is a free-flowing liquid at temperatures greater than −20° C.
16. A method for controlling undesirable vegetation in crops comprising:
applying a herbicidal concentrate composition to a plant, wherein the herbicidal concentrate composition comprises:
(a) water,
(b) a glyphosate amine salt, and
(c) a 2,4-D choline salt, in which
(i) the glyphosate amine salt is a primary, secondary, tertiary or quaternary alkylamine, alkanolamine or alkylalkanolamine salts, wherein alkyl and alkanol groups are saturated and contain from C 1 -C 3 carbon atoms individually, with the proviso that no more than one of the amine salts in the composition is a primary amine salt,
(ii) the herbicidal concentrate composition contains a total active ingredient loading of at least 350 gae/L of the glyphosate amine salt and the 2,4-D choline salt,
(iii) the weight ratio of the glyphosate amine salt to the 2,4-D choline salt in the herbicidal concentrate composition is from 1:2.3 to 2.3:1,
(iv) the pH of the concentrate composition is from 6.0 to 8.0,
(v) does not exhibit separation or precipitation at a temperature below about 0° C.
17. The method of claim 16 , further comprising diluting the herbicidal concentrate composition with water prior to applying the herbicidal concentrate composition to the plant.
18. The concentrate composition of claim 9 , wherein the weight ratio of the glyphosate amine salt to the 2,4-D choline salt is 1:1.
19. A homogeneous, stable, high-strength aqueous herbicidal concentrate composition comprising:
(a) water,
(b) a glyphosate amine salt, and
(c) a 2,4-D choline salt, in which
(i) the glyphosate amine salt is a primary, secondary, tertiary or quaternary alkylamine, alkanolamine or alkylalkanolamine salts, wherein the alkyl and alkanol groups are saturated and contain from C 1 -C 3 carbon atoms individually, with the proviso that no more than one of the amine salts in the composition is a primary amine salt,
(ii) the concentrate composition contains a total active ingredient loading of at least 350 gae/L of the glyphosate amine salt and the 2,4-D choline salt,
(iii) the weight ratio of the glyphosate amine salt to the 2,4-D choline salt of the concentrate composition is from 1:2.3 to 2.3:1, and
(iv) the pH of the concentrate composition is from 6.5 to 7.5.