Automatic travel control system and field work vehicle

Provided is an automatic travel control system for a field work vehicle that performs field work for supplying agricultural materials to a field by repeating automatic back-and-forth travel on a travel path comprising an internal path and a turning path. An automatic travel control system for a field work vehicle that performs a supply preparation process for stopping travel so as to supply materials at a predetermined supply side every time the field work vehicle travels on an internal path for a predetermined number of travels, the automatic travel control system being provided with: a travel control unit (32) that controls automatic travel including the supply preparation process; a work control unit (33) that controls field work; a number-of-travel operation unit (53) that accepts the selection of the number of travels; and a material supply setting unit (41) that sets the number of travels on the basis of an input to the number-of-travels operation unit (53). 一种田地作业车的自动行驶控制系统，该田地作业车反复进行在由内部路径和转弯路径构成的行驶路径