US Patent 6948663 Yard chemical dispensing apparatus

A chemical distribution apparatus contains at least one, and preferably multiple chambers which house magazines which accept solid lawn treatment chemicals such as fertilizers, herbicides, fungicides, insecticides, lime treatments, pre-emergents, post-emergents, and the like. As water is passed into the chemical distribution apparatus, it is preferably selectively controlled by a controller to a particular chamber for distribution of a particular chemical in accordance with a pre-set schedule.