HECKMAN MODEL FOR IDENTIFYING THE PROBABILITY OF ADOPTION OF IMPROVED VARIETIES OF SORGHUM, MILLET, GROUNDNUT AND SESAME IN NORTH KORDOFAN STATE, SUDAN. University of Kordofan Journal of Natural Resources & Enviromental Studies, [S. l.], v. 5, n. 01, p. 26–43, 2025. Disponível em: https://journals.kordofan.edu.sd/jr/index.php/ukjnres/article/view/12. Acesso em: 1 jan. 2026.