What were some agricultural differences between the lower and upper south?

The biggest agricultural difference between the Upper and the Lower South was that the states of the Lower South were heavily engaged in the production of cotton as a cash crop. Especially in the so-called "Black Belt" that ran through upcountry Georgia, Alabama and Mississippi, some areas in the Lower South were essentially monocultural, producing cotton for a growing international market. States in the Upper South, especially Virginia, Maryland, and Kentucky, also cultivated cash crops, especially tobacco, but overall the agricultural economy was more diverse. As early as the eighteenth century, many farmers and planters in the region were growing wheat, corn, and hemp among other crops. One effect of this was that the Upper South, having an excess of slave labor (many of these crops were not as labor-intensive as cotton and other cash crops) sold enslaved people to planters in the Deep South. The internal slave trade that developed witnessed over one million people sold to planters in the Lower South. Many (perhaps most) of these people saw their families torn apart, never to be reunited. As a result, slavery, or at least slave labor, became less important to the Upper South.