na INLIS000000000004176 Ind 0010-1118004176 Soil tillage in Africa: needs and challenges FOOD AND AGRICULTURE ORGANIZATION. LAND AND WATER DEVELOPMENT DIVISION Food and Agriculture Organization Rome FAO 1993 xiv, 190 p.: ill.; 30 cm. xiv, 190 p.: ill.; 30 cm. 92-5-103442-7 Bibl.: p.167-190 631.4 SOIL CHEMICOPHYSICAL PROPERTIES TILLAGE AFRICA 46/FAO/94