Abstract: The present invention relates to a mobile irrigation bar comprising a first connector means for supplying the bar, which is disposed at a first end of this bar, a second connector means which is disposed at the second end, and first and second main means for supporting the bar, disposed at the second and first ends and oriented so as to follow initial paths perpendicular to the bar, wherein the bar comprises first and second auxiliary means for supporting it on the ground, which are disposed near the second and first ends and which, in active configuration, are oriented to follow paths perpendicular to those of the main means, and a device for selecting the functioning of one pair of the support means from the following two pairs: first main means and second auxiliary means; second main means and first auxiliary means. One application of the invention is the irrigation of a strip of land of substantially constant width.