TY - BOOK AU - Acquaah,George TI - Principles of crop production: theory, techniques, and technology SN - 0131145568 U1 - 631.58201 22 PY - 2005/// CY - New Delhi PB - Pearson Prentice Hall KW - Field crops KW - Food crops KW - Crop yields N1 - Includes bibliographical references and index ER -