1. Nitrogen metabolism and crop productivity;Below,2002
2. Physiological changes accompanying long-term selection for grain protein in maize;Below,2004
3. Genetic variation for nitrogen use efficiency in a set of recombinant maize inbred lines. I. Agrophysiological results;Bertin;Maydica,2000
4. Agroecosystems, nitrogen-use efficiency, and nitrogen management;Cassman;Ambio,2002
5. Genetic yield improvement of U.S. maize cultivars under varying fertility and climatic environments;Castleberry;Crop Sci.,1984