1. Optimization of method and time of nitrogen application for increased nitrogen use efficiency and yield in maize;Akbar F.;Pakistan Journal of Botany,1999
2. Irrigation and nitrogen fertilization of maize;Araujo W.F.;Scientia Agricola, Boa Vista Brazil,1999
3. Maize yield responses to mineral fertilization;Bertic B.;Cer. Res. Com.,2006
4. Dobermann A. — Arkebauer K. — Cassman R. — Drijber R. — Lindquist S. — Madhavan J. — Markwell L. — Nelson J. — Specht D. — Walters H. — Yang B. — Amos D. — Binder C. — Murphy G.: 2000. Corn yield potential and optimal soil productivity in irrigated corn/soybean systems. Department of Agronomy and Horticulture, University of Nebraska