Tank mixing chemicals is an essential part of spraying for many reasons;

  • Improved efficacy in the case of spray adjuvants
  • Conditioning water with products such as ammonium sulphate
  • Mixing modes of action for resistance management
  • Mixing pesticides to increase the spectrum of pest control and allow less spray passes

Be aware that mixing chemicals can create unwanted outcomes and every chemical added doubles the complicity of the mix. If in doubt try a jar test first and see if the mix works on a small scale before mixing full tank loads.

Water is Your Friend

If you are adding more chemicals it is always better to err on adding more water. Likewise, take care when using some batching plants or in situations where products are mixed at high concentrations. Dilution of chemicals can help with stability.


Order of mixing chemicals can be critical. This season for example some farmers had problems with Butafenacil 200 EC only because they added it after Glyphosate. This particular issue was further exacerbated by a low pH created by adding Farmpro 700 first.

Make sure you check the formulation of the products you are mixing and match it to the right step in the mixing order as shown in the diagram.

If you would like a copy of the Tank Mixing Guide in the form of a sticker please contact 4Farmers.