1. Aktan, Selman 1976 Nitrate-nitrogen accumulation and distribution in the soil profile during a fallow grain rotation as influenced by different levels of soil profile moisture. M.S. Thesis, Oregon State University, Corvallis.
2. Alessi, J. and Power, J. F. 1971 Influences of method of seeding and moisture on winter wheat survival and yield. Agron. J. 63, 81–83.
3. Arnon, I. 1975 Physiological principles of dryland crop production, pp. 3–145. In: Gupta, U. S. (ed.), Physiological Aspects of Dryland Farming, Oxford & IBH, New Delhi. Arnon, I. 1972 Crop Production in Dry Regions, 2 vols., Leonard Hill, London.
4. Arnon, I. and Blum, A. 1964 Response of hybrid and self-pollinated sorghum varieties to moisture regime and intra-row competition. Israel J. Agric. Res. 14, 45–53.
5. Asana, R. D. 1962 Analysis of drought resistance in wheat. Arid Zone Res. 16, 182–190.