na INLIS000000000004383 Ind 0010-1118004383 Crop management research and extension : the products and their impact on productivity TRAXLER, Greg Greg Traxler and Derek Byerlee Lisboa CIMMYT 1992 vii, 57 p.: ill.; 26 cm.-- vii, 57 p.: ill.; 26 cm.-- Bibl.: p. 55 633.1-11 RESEARCH CROP MANAGEMENT EXTENSION ACTIVITIES 614/MS/94