Best Mini Round Hay Baler for Sale The hay baler machine/straw bundling machine is widely used in agriculture and animal husbandry. It can collect and bundle green grass, straw, wheat stalk, corn stalk, wheat/ rice straw, grass, corn straw, pasture straw bale, etc. After baled by the machine, the bundle is very convenient for transportation, reserve and deep processing. Its compact design enables the cut grass to be collected and baled on any type of ground, also on hills, in mountain areas and on steep slopes. Ã? It is highly efficient machine because it enable bales to be prepared which are easy to handle and with an hourly working speed of 2-5km. So, the hay straw baler machine is very welcomed by domestic and overseas farmers.