In the US we call these a 'traveling gun irrigator'. The gun is just a giant impact sprinkler that rotates like a smaller impact sprinkler, but it also moves across the field (see the tracks?) either pulled by a cable or it may be self propelled by a water turbine. A large hose on a reel supplies the water.
I saw a lot of these when I was in France a few years ago. They're ideal for watering small to medium fields, and they can be moved from field to field as needed.
Farms - Misc, Resources - Water 
I saw a lot of these when I was in France a few years ago. They're ideal for watering small to medium fields, and they can be moved from field to field as needed.