France Tabac, 1987, 31, p. 20-5, ISSN.0296-3361 The management of soil tillage for tobacco SCHMELTZ C. Ploughing. Irrigation. Soil improvement. Fertilization. Rotation....
France Tabac, 1987, 31, p. 26-9, ISSN.0296-3361 Tobacco as test-plant to study soil degradation SCHMELTZ C.