Before Carver arrived, agriculture was not a popular subject at Tuskegee. Students associated it with the poverty of people who farmed only to grow enough food to survive.
But Carver was a trained scientist, and he treated the study of agriculture as a science. For him, agriculture was about real-life botany (the study of plants) and chemistry. Carver taught students respect for agriculture, and the department grew.
While the department didn't produce many farmers, it did produce many teachers. These young teachers were able to help fulfill the Tuskegee mission to help all African Americans by going out into the world and spreading their knowledge of agricultural science with black farmers.