Root-growth response of winter barley to subsoiling |
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Authors: | G. Ide G. Hofman C. Ossemerct M. Van Ruymbeke |
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Affiliation: | 1. Laboratory of Agricultural Soil Sciences, Faculty of Agricultural Sciences, State University of Ghent, Coupure, 653, B-9000 Ghent Belgium;2. Committee of Applied Pedology, Faculty of Agricultural Sciences, State University of Ghent, Coupure, 653, B-9000 Ghent Belgium |
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Abstract: | Root growth of winter barley was studied on 2 Belgian silt loam soils after subsoiling to 60 cm depth. In the first field (well-drained) rooting depth increased significantly after removal of a plough pan. At the flowering stage, total root weight in the soil layers between 25–50 cm and 50–75 cm was 125% and 325%, respectively, higher on the subsoiled plots than on the control. The P2O5 and K2O concentrations in the roots were significantly increased by 20% and 40%, respectively. In the second field (imperfectly drained) with initially relatively high bulk densities in the subsoil, the influence of subsoiling was negligible. In this study, the clearly-shown root-growth retardation that resulted in a lower yield on the control, seemed to be caused by the high penetration resistance in the plough sole (> 3MPA) rather than poor aeration status induced by the high bulk densities. |
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