i wonder if there is any way to make an xml to where a "hot mix" could fertilize and kill weeds at the same time. I'm a custom applicator for Nutrien.
It may be possible, i will look into it. There is a mod called "Chemical Mixing", some sprayers let you have an extra tank on the front for more herbicide/fertilizer. If you use the chemical mixing mod, you can put fertilizer in your front tank and herbicide in the back and it will apply both together.
It may be possible to have a sprayer with two separate fill sections, similar to how to how semi truck grain trailers have separate sections that can be filled with different crops. If i edit the XML to make the game think that it has two seperate sections, it should be able to be filled with two different products (ie; Herbicide & Fertilizer). Then if you use it with the chemical mixing mod, they will get "mixed" and it will let you use them together without having a separate tank on the front. I will test this on my end.
It seems that the game defaults to using the first fillunit for spraying even if you have the Herbicide Mixing mod. My idea worked as the sprayer was able to be filled with herbicide and fertilizer, the problem is that it only sprays one of them unless you have a front tank. I will be exploring other solutions, this project may take some time.