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Farm tractors may be divided into two groups: wheeled and track-laying. 1_______.Standard wheeled tractors are used for general farm work and do not have the special features associated with row-crop tractors. 2_______.But in addition they are so specially designed for working on root.
Track-laying tractors have the great advantage that they can be used for heavy loads on almost any class of land. 3_______. But their greater initial cost and their maintenance may outweigh this advantage. The crawler is, however, the more efficient type of tractor. 4_______.
Wheeled tractors may be further subdivided into standard and row-crop types
Row-crop tractors can be used for all ordinary purposes
They are considerably more economical in fuel than are wheel machines
The crawler can go on the land earlier after rain and so can work a greater number of days per year