Sheaffer, Craig C. Introduction to agronomy : food, crops, and environment / Craig C. Sheaffer, Kristine M. Moncada. - Australia : Delmar Cengage Learning, c2009. - xii, 564 p. : ill. ; 26 cm. Includes bibliographical references and index. ISBN: 9781418050375 Subjects--Topical Terms: Agronomy.Food crops. LC Class. No.: SB91 / .S53 2009 CIRC Dewey Class. No.: 630