The design of the machine is an important consideration. Because of the diversity of agricultural machinery, several designs might produce an acceptable level of performance, yet small variations in design may make one more suitable than the others for a given situation. For most tillage equipment, the cost of the machine is primarily determined by the quantity of the steel it contains. A tillage machine designed for use in fields that are large and relatively flat will have wide rigid sections. But a machine that is designed for terraced or undulating fields will require a frame with more flexibility. More flexibility will require a more complicated frame that will cost more money. It is sometimes difficult to know what features of a design improve the value of a machine for a particular situation without an understanding of the advantages and disadvantages of the different designs.

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