The present invention relates to improved apparatus, systems and methods for the application of water, fertilizers and herbicides to municipal plants, crop plants, indoor plants, nursery plants and the like. In one form, the invention provides a self-powered mobile apparatus for delivering a liquid agent. The apparatus has a reservoir for the agent and a dispenser, electronic plant identification means or geographic location means, and an electronic controller to control delivery of the agent based on (i) an output of the electronic plant identification or geographic location means, or (ii) an output of a remote electronic plant identification or geographic location means.
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