Tillage-Objectives: (1) Preparation of seedbed (2)Control of weeds (3)Fluff soil -reduce bulk density of root zone (4)Soil and Water conservation 犁梁 图122各种无壁犁和松土铲 片上装上犁 柱即为深松土犁 铧翼 犁侧板后踵 胫刃 犁铧 犁铧切削刃 犁铧胫板 铧尖 图12-1铧犁主犁示意图 图12-3铰链耙架尖齿耙Tillage – Objectives: (1) Preparation of seedbed (2) Control of weeds (3) Fluff soil - reduce bulk density of root zone (4) Soil and Water conservation