In this paper, based on the design of a mixed logic dynamic system(MLDS) and the methodology of a logical discrete event system, an integrated model is proposes to design and implemented an automated guided vehicle(AGV) controller working in a pot plant field. Navigation tests are performed in a pot plant field to simulate spraying or transport operations. Results revealed that the implementation of such an integrated controller model is feasible. The approach proposed in this work could be applied to controller design of the finite state automaton for future farmland AGVs.