Abstract
The maximum axial growth pressure of roots of Lupinus albus cv Lublanc and Lupinus albus cv Lunoble (spring and autumn-sown cultivars respectively) were measured. The mean values were not significantly different with an overall mean value of 645 kPa. This value is not unusually large for plant roots and is surprising because lupins are known for their ability to penetrate strong soils. The autumn cultivar had a significantly greater maximum elongation rate under zero mechanical impedance than the spring cultivar. The impeded diameters were also larger in the autumn cultivars.
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