中国小型拖拉机的更新研究(英文)

Study on the Renewal of Small Tractor in China

在分析农户使用、更新小型拖拉机经济行为的基础上,推证并建立了户营小型拖拉机的作业成本随使用年限增加而变化的规律,进一步提出户营小型拖拉机在作业量充足条件下的“成本均等理论”和在作业量欠充足条件下的“成本递减理论”,并通过实地采样加以验证。据此阐述了户营小型拖拉机难以更新的机理,得出在经济欠发达地区户营小型拖拉机基本上不存在最佳更新期的结论。

Based on analysis of farmer's using and renewing small tractor,the law,that costs of small tractor vary with their service-life,was rationalized and established.Two theories were approached and testified with real-sampling,that is,″costs equality theory″,while the work of tractor is suffi-cient;″costs decrease theory″,while the work is insufficient.In term of these,the mechanism that household small tractor is hard to renew is presented,and the conclusion is drawn:there exist no optimum renew time of household small tractor in undeveloped locality.