Development of fine and coarse roots of Thuja occidentalis `Brabant' in non-irrigated and drip irrigated field plots |
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Authors: | Pronk A.A. De Willigen P. Heuvelink E. Challa H. |
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Affiliation: | (1) Nursery Stock Unit, Applied Plant Research, P.O. Box 118, 2770 AC Boskoop, The Netherlands;(2) Alterra Green World Research, P.O. Box 47, 6700 AA Wageningen, The Netherlands;(3) Horticultural Production Chains group, Wageningen University, Marijkeweg 22, 6709 PG Wageningen, The Netherlands;(4) Farm Technology Group, Department of Agrotechnology and Food Sciences, Wageningen University, P.O. Box 43, 6700 AA Wageningen, The Netherlands |
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Abstract: | Aboveground dry mass, total root dry mass and root length density of the fine roots of Thuja occidentalis `Brabant' were determined under non- and drip-irrigated field conditions. Two-dimensional diffusion parameters for dynamic root growth were estimated based on dry mass production of the fine roots and the concept of the convective-diffusion model of cylindrical root growth and proliferation. Drip irrigation increased above-ground dry mass and the shoot:root ratio compared with no irrigation. Dry mass of the coarse roots increased as well due to drip irrigation. No effect on total or fine root dry mass was found. Drip irrigation increased root length densities in the top 0.1 m but not significantly. However, drip irrigation decreased root proliferation in depth by 27%, whereas proliferation in the horizontal direction was not altered. Measured root length densities were overestimated by 6–21% by the model (0.68 < R2 < 0.92). |
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Keywords: | diffusion parameters eastern white cedar root length density root growth and proliferation shoot:root ratio |
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