1. First experiences with direct drilling in Germany;Baeumer;Neth. J. Agric. Sci.,1970
2. Zero-tillage;Baeumer;Adv. Agron.,1973
3. Crop husbandry on naturally compacted soils;Bakermans;Neth. J. Agric. Sci.,1970
4. The effects of different methods of cultivation and direct drilling and of contrasting methods of straw disposal on populations of earthworms;Barnes;J. Soil Sci.,1979
5. Some influences of zero-tillage on the structure and stability of a fine textured river levee soil;Boone;Neth. J. Agric. Sci.,1976