What type of crop plantations proved to provide slaves with the worst living conditions?

The major crops that were developed throughout the Americas with slave labor were cotton, tobacco, sugar cane, and rice. With the growth of these labor intensive crops so grew the slave trade in the Americas. With increased demand in Europe and the United States, slave traders supplied high levels of slaves from Africa to work in the fields of these crops. With the growing of these crops slaves faced terrible conditions from their capture, transport, and enslavement in the Americas.