1. Nitrogen response and cultural practices for corn-based cropping systems in the Peruvian Amazon;Benites,1981
2. Significance of developing and transferring technology to farmers with limited resources;Brady,1981
3. L'utilization de l'azote engrais par la culture du mais en Cote d'Ivoire;Chabalier,1979
4. Soil diversity in the tropics: Implications for agricultural development;Eswaran,1992
5. The nitrogen cycle in West Africa — agronomic considerations;Greenland,1980