Oil adjuvants can reduce rainfast periods, provide more uniform droplet size, and result in less spray evaporation and provide excellent penetration of herbicide into waxy leaves. Examples are Emulsified Petroleum-based Oils (Crop Oils and Crop Oil Concentrates), and Methylated Seed Oils (occasionally referred to as Methyl Esters or MSO). The most common examples of oil adjuvants are:

  • Methylated seed oils: Occasionally referred to as methyl esters. The products in this group are specific in their adjuvant effect. They function exceptionally well with many ­herbicide chemistries. Vegetable seed oils all contain constituents called fatty acids. These organic acids may be transformed by a process called esterification by reacting with an alcohol. In methyl ester production, the fatty acids are esterified with methyl alcohol. The end result is a seed oil with new properties of solvency and water affinity.
  • Emulsified petroleum based oils: Commonly called crop oil concentrates or oil surfactants. The usual ratio is 16 to 20% surfactant emulsifier and 80 to 84% petroleum based oil.

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