Abstract
Abstract Orthodox cultivation by ploughing, rolling, discing, levelling, and harrowing, with and without subsoiling, was compared with subsurface loosening to plough depth without soil inversion, with shallow surface cultivation, and with no cultivation, on 2 successive crops of chou moellier. The first crop was out of medium to good quality grass-clover pasture. The soil was a heavy silt loam on clay loam. Herbicides were used on all treatments except on those receiving orthodox cultivation. Results were as follows: 1. Crop yields were not significantly affected by sub-surface loosening or by subsoiling. 2. A very marked decline in nitrogen fertility was observed in the second year. 3. Herbicides without cultivation produced as good a crop as orthodox cultivation in the first year in the presence of large amounts of decomposing plant residue derived from grass-clover pasture, but produced an inferior crop in the second year when much less plant residue was present. 4. The cultivation treatments significa...
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