TY - PRO AU - Byerlee,D. AU - Heisey,P.W. AU - Pingali,P.L. TI - Realizing yield gains for food staples in developing countries in the early 21st century: prospects and challenges PY - 1999/// CY - The Vatican PB - Pontificia Academia Scientiarum KW - Agrarian reform KW - Developing Countries KW - Economic development KW - AGROVOC KW - Economic environment KW - Land policies KW - Land reform KW - Plant production KW - Profitability ER -