Hay, Robert K.M. 1946 The Physiology of crop yield / Hay, Robert K.M., and Porter, John R. , Rev.ed. of: An introduction to the physiology of crop yield. 1989. - 2nd - UK : Blackwell Publishing c 2006 - xiii, 314 p. ill. ; 25 cm. Includes bibliographical references and index. ISBN: 1-4051-0859-2 Subjects--Topical Terms: Crops Physiology. Crop yields. LC Class. No.: SB112.5 / .H39 2006