English: Making silage for feeding animals in winter on Lowsteads Farm near Longhoughton in Northumberland, Great Britain. Marked as 'Low Stead' on the OS 1:50000 map, Lowsteads Farm is half-a-mile south of Longhoughton village. In this photograph, the tractor is towing a baler which collects the partially-dried mown grass and compacts it into cylindrical bales.
Silage is animal fodder that is harvested while still green and kept succulent by partial fermentation. This can be done in a silo (hence the name) or in a silage clamp. More recently, the practice has been to ferment silage by wrapping baled harvested fodder - usually grass in the UK - in polywrap plastic sheeting.