The farmers responded to the shortage of labor supply by adopting mechanization in farm operations.Tractor use in land preparation started in area with large size of farm.
Since 1969 Thailand began to produce power tillers were in operation.During 1996-98,the number of tractors and power tillers were nearly four times that of 1981.As a result,use of animals for land preparation has virtually ceased in most part of the central plain and the northern region.