Here is some good information from UGA Extension Weed Scients Dr. Eric Prostko. He performed a few tank mixes for us as well as answered some common questions:
1) Can I tank-mix Prowl EC and Prowl H20?
I have never have done that in my research plots but I recently did a small tank-mix test (Figure 1). With good agitation, I did not observe any problems. Do not mix these two herbicides together before putting in water. They should be put in spray tank (already filled with water) separately.
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| Figure 1. Prowl H20 3.8ASC + Prowl 3.33EC Tank-Mix (32 oz/A of each in 15 GPA, Prowl H20 was put in 1st) |
2) Can I tank-mix dry and liquid Valor formulations together in a spray tank?
I have never done that either in my research plots but I did another small tank-mix test (Figure 2). With good agitation, I did not observe any problems. Remember, it is always a good idea to pre-slurry dry formulations in water before dumping into a large spray tank.
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| Figure 2. Valor SX 51WG + Valor EZ 4L Tank-Mix (3 oz/A of each in 15 GPA) |
3) When tank-mixing various pesticides, what is the correct mixing order?
The general formulation science mixing order is as follows:
a) Water soluble bags (WSB)
b) Water soluble granules (WSG)
c) Water dispersible granules (WG, XP, DF)
d) Wettable powders (WP)
e) Water based suspension concentrates/aqueous flowables (SC, F)
f) Water soluble concentrates (SL)
g) Suspoemulsions (SE)
h) Oil-based suspension concentrates (OD)
i) Emulsifiable concentrates (EC)
j) Surfactants, oils, adjuvants
k) Soluble fertilizers
l) Drift retardants
There is an app called Mix-Tank (Precision Laboratories) that you might find useful (https://www.mixtankapp.com/). There might be some other apps out there that I am not yet aware of?
4) How do I mix Reflex and Gramoxone?
a) Add 1/2 of the required amount of clean water into the spray tank
b) Start up and maintain tank agitation
c) Add NIS
d) Add Reflex
e) Add Gramoxone
f) Add remaining amount of clean water
5) How do I mix Atrazine and Halex GT?
a) Add 1/2 of the required amount of clean water into the spray tank and start/maintain agitation
b) Add AMS (**only if water quality sample indicates need)
c) Add NIS
d) Add atrazine (make sure atrazine is fully dispersed before adding other products)
e) Add Halex GT
f) Add remaining amount of clean water