Large numbers of slaves were employed in agriculture. As a general rule, slaves were considered suitable for working some crops but not others. Slaves rarely were employed in growing grains such as rye, oats, wheat, millet, and barley, although at one time or another slaves sowed and especially harvested all of these crops. Most favoured by slave owners were commercial crops such as olives, grapes, sugar, cotton, tobacco, coffee, and certain forms of rice that demanded intense labour to plant, considerable tending throughout the growing season, and significant labour for harvesting. The presence or absence of such crops and their ...(100 of 16450 words)