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导言圆盘耙和中耕机等牵引机具的耕作深度,一般是用一个人工操纵阀控制的液压油缸来调节的。以前的著作(Dyck 1975;Harrison 和Reed1962)已证实,即使液压油缸保持不动,耕作深度仍可能有较大的
INTRODUCTION Farming depths on traction implements such as disc harrows and cultivators are generally regulated by a manually controlled valve controlled hydraulic cylinder. Previous works (Dyck 1975; Harrison and Reed 1962) have demonstrated that even if the hydraulic ram remains stationary, the tillage depth can still be larger