A machine used in farming WordNet 3.0 & Open English WordNet

Agricultural machinery relates to the mechanical structures and devices used in farming or other agriculture. Wikipedia

Machines utilized for tillage, planting, cultivation and harvesting of crops. Despite its benefits in increasing yields, mechanisation has clearly had some adverse environmental effects: deep ploughing exposes more soil to wind and water erosion; crop residues can be removed as opposed to ploughing back into the soil; removal of residues can lead to a serious loss of organic content in the soil, which may increase the risk of soil erosion. OmegaWiki