Malawi Soil Pan (image) Washington State University Caption Rhoda Mang'yana of Malawi is one of thousands of African farmers improving their depleted soil by growing trees and annual crops that stay in the ground two years or more. Here she grows maize near "fertilizer trees" to improve her farm's crop yield and soil fertility. Credit ©Jim Richardson Usage Restrictions Pictures may be reused with permission. Reportres can contact Jim Richardson at email@example.com. Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.