Éditeur(s) : International Maize and Wheat Improvement CenterInternational Maize and Wheat Improvement Center ( México D.F. México ) Résumé : (Bibliography) Includes bibliographical references (p. 17-19). (Statement of Responsibility) K.S. Fischer, E.C. Johnson and G.O. Edmeades. "An earlier version of this paper was presented at a Symposium on "Principles and Methods in Crop Improvement for Drought Resistance: with emphasis on rice" at the International Rice Research Institute (IRRI), May 4-8, 1981." Tropics Tropics Tropics