Penetrometer resistance,root penetration resistance and root elongation rate in two sandy loam soils |
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Authors: | A G Bengough C E Mullins |
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Institution: | (1) Plant and Soil Science Department, University of Aberdeen, AB9 2UE Aberdeen, UK;(2) Present address: Soil-Plant Dynamics Group, Cellular and Environmental Physiology Department, Scottish Crop Research Institute, DD2 5DA Dundee, UK |
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Abstract: | Root penetration resistance and elongation of maize seedling roots were measured directly in undisturbed cores of two sandy
loam soils. Root elongation rate was negatively correlated with root penetration resistance, and was reduced to about 50 to
60% of that of unimpeded controls by a resistance of between 0.26 and 0.47 MPa. Resistance to a 30° semiangle, 1 mm diameter
penetrometer was between about 4.5 and 7.5 times greater than the measured root penetration resistance. However, resistance
to a 5° semiangle, 1 mm diameter probe was approximately the same as the resistnace to root penetration after subtracting
the frictional component of resistance. The diameter of roots grown in the undisturbed cores was greater than that of roots
grown in loose soil, probably as a direct result of the larger mechanical impedance in the cores. |
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Keywords: | maize mechanical stress penetrometer root growth sandy loam |
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