走出无限期使用旧拖拉机的误区笔者最近对山东省定陶县这一人口仅有５０万、耕地仅有４．６６万公顷、拖拉机只有４０００多台的小县调查了解到：全县大、中型拖拉机使用期在１０年以上的就有近４００台，占保有量的近４０％；小型拖拉机使用期在８年以上的就达９００余台，占 Misunderstanding out of the old tractor indefinitely I recently Dingtao County in Shandong Province this population of only 500,000, only 46,600 hectares of arable land, tractors only more than 4,000 small counties learned that: the county large and medium-sized Tractor life in more than 10 years there are nearly 400 units, accounting for nearly 40% of the possession; small tractor service life of more than 900 years in more than 900 units, accounting for