Low volatility auxin herbicide formulations

Abstract

Low volatility dicamba herbicide formulations are described. In some embodiments, concentrate formulations comprising dicamba monoethanolamine salt, dicamba potassium salt, or mixed dicamba salts are provided. In other embodiments, a dicamba salt is combined with a polybasic polymer.

1 - 166 . (canceled) 
     
     
         167 . A method for reducing the volatility of an auxin herbicide from a herbicidal application mixture, the method comprising:
 mixing (a) an auxin herbicide salt selected from the group consisting of agriculturally acceptable salts of 2,4-D, 2,4-DB, dichlorprop, MCPA, MCPB, aminopyralid, clopyralid, fluroxypyr, triclopyr, mecoprop, mecoprop-P, dicamba, picloram, quinclorac, aminocyclopyrachlor, racemic mixtures thereof, resolved isomers thereof, and mixtures thereof,   
       (b) a salt of glyphosate, and (c) water to form the herbicidal application mixture, wherein the amount of auxin herbicide salt that is mixed is such that the herbicidal application mixture has an auxin herbicide concentration from about 0.1 to about 50 g a.e./L, and
 mixing a base or pH buffer with the application mixture such that the base or pH buffer raises the pH of the herbicidal application mixture to be within the range from about 5 to about 10 and the base or pH buffer comprises an ion selected from the group consisting of sodium, potassium, dimethylammonium, monoethanolammonium, isopropylammonium, diglycolammonium, and mixtures thereof. 
 
     
     
         168 . The method of  claim 167  wherein the auxin herbicide comprises an agriculturally acceptable salt of dicamba. 
     
     
         169 . The method of  claim 168  wherein the auxin herbicide comprises at least one salt of dicamba selected from the group consisting of the sodium salt of dicamba, potassium salt of dicamba, monoethanolamine salt of dicamba, diglycolamine salt of dicamba, and mixtures thereof. 
     
     
         170 . The method of  claim 167  wherein the pH of the herbicidal application mixture is from about 7 to about 9. 
     
     
         171 . The method of  claim 167  wherein the base or pH buffer comprises a sodium or potassium ion. 
     
     
         172 . The method of  claim 167  wherein the method further comprises mixing one or more soluble polybasic polymers with the herbicidal application mixture. 
     
     
         173 . The method of  claim 167  wherein the weight ratio on an acid equivalent basis of the auxin herbicide salt to the salt of glyphosate in the herbicidal application mixture is from about 5:1 to about 1:5. 
     
     
         174 . The method of  claim 167  wherein the weight ratio on an acid equivalent basis of the auxin herbicide salt to the salt of glyphosate in the herbicidal application mixture is from about 3:1 to about 1:3. 
     
     
         175 . The method of  claim 168  wherein the salt of dicamba comprises the diglycolamine salt of dicamba and the weight ratio on an acid equivalent basis of the auxin herbicide to glyphosate in the herbicidal application mixture is from about 3:1 to about 1:3. 
     
     
         176 . The method of  claim 168  wherein the salt of dicamba comprises the monoethanolamine salt of dicamba and the weight ratio on an acid equivalent basis of the auxin herbicide to glyphosate in the herbicidal application mixture is from about 3:1 to about 1:3. 
     
     
         177 . The method of  claim 167  further comprising applying the herbicidal application mixture to a weed. 
     
     
         178 . A method for reducing the volatility of dicamba from a herbicidal application mixture, the method comprising:
 mixing a salt of dicamba, a salt of glyphosate, and water, to form the herbicidal application mixture, wherein the amount of dicamba salt that is mixed is such that the herbicidal application mixture has a dicamba salt concentration from about 0.1 to about 50 g a.e./L, and the weight ratio on an acid equivalent basis of the salt of dicamba to the salt of glyphosate in the herbicidal application mixture is from about 50:1 to about 1:5, and   mixing a base or pH buffer with the application mixture to increase the pH of the application mixture to from about 5 to about 10, wherein the base or pH buffer comprises an ion selected from the group consisting of sodium, potassium, dimethylammonium, monoethanolammonium, isopropylammonium, diglycolammonium, and mixtures thereof.   
     
     
         179 . The method of  claim 178  wherein the salt of dicamba comprises at least one salt of dicamba selected from the group consisting of the sodium salt of dicamba, potassium salt of dicamba, monoethanolamine salt of dicamba, diglycolamine salt of dicamba, and mixtures thereof. 
     
     
         180 . The method of  claim 178  wherein the pH of the herbicidal application mixture is from about 7 to about 9. 
     
     
         181 . The method of  claim 178  wherein the method further comprises mixing one or more soluble polybasic polymers with the herbicidal application mixture. 
     
     
         182 . The method of  claim 178  wherein the weight ratio on an acid equivalent basis of the salt of dicamba to the salt of glyphosate in the herbicidal application mixture is from about 5:1 to about 1:5. 
     
     
         183 . The method of  claim 182  wherein the weight ratio on an acid equivalent basis of the salt of dicamba to the salt of glyphosate in the herbicidal application mixture is from about 3:1 to about 1:3. 
     
     
         184 . The method of  claim 178  further comprising applying the herbicidal application mixture to a weed.