How to sow castor seeds?

Castor is mainly propagated through seeds. The selected seeds for planting must be healthy and come from prolific mother plants. In mechanized countries, seed are planted about 4 to 7.5 cm deep in rows 1 meter apart; And about 50 cm apart within rows. In un mechanized countries, seeds are planted about 60 by 90 cm apart that prefer larger varieties. About 10-12 kg of seeds is required per hectare. Seeds are treated with Carbendazim at 2 gm/kg of seed for preventing some seed borne diseases. Then, soak the seeds in water for about 20 hours.