2.4 Tank-mixing
Applying more than one product at the same time (tank-mixing) can improve the logistics of spraying provided the respective treatment timings coincide and the formulations are chemically and physically compatible. Only approved mixtures should be used.
Risks associated with tank mixing may include a reduction in biological activity due to product antagonism. This may be seen as crop scorch, which although it may appear only transient, can reduce final yield.
The most common problem affecting the spraying operation is physical incompatibility, which can block nozzles and filters as well as causing separation in the tank if the agitation through the return to tank is inadequate.
Where trace elements are used as admixture candidates, blockages are common. The product label should give advice on suitable tank mix partners and the correct sequence of their introduction into the spray tank. Where an induction hopper is used to introduce products into the spray tank, it is advisable to add one product at a time. Agitation of the first material introduced into the tank is essential before the second formulation is introduced.
Water temperature and quality may also influence the chemical compatibility of tank mixes.