How did blacks learn how to plant tend the rice crops and process it?

Answer 1

The same thing on the outside of a corn stalk == ==

Answer 2

Blacks in the American South learned rice cultivation techniques from Africans who were skilled in rice farming. Enslaved Africans brought their knowledge of rice cultivation and processing with them to the United States, and they passed on these skills to subsequent generations. Through trial and error, experimentation, and adaptation to the local environment, they developed successful rice cultivation practices.