Castor being a deep-rooted crop requires well-prepared seedbed (deep rooting medium). Deep ploughing in summer is necessary to break up any compact layer in the soil so that roots can penetrate deep in the soil to obtain moisture from deep layer of the soil during dry periods. Deep ploughing will also increase water-holding capacity of the soil. Disc harrowing should be done followed by ploughing to break clods, level the seedbed and destroy weeds. The seedbed should be moist to a depth of 15-20 cm.