Root growth of potato crops on a marine-clay soil |
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Authors: | J Vos J Groenwold |
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Institution: | (1) Centre for Agrobiological Research (CABO), P.O. Box 14, 6700 AA Wageningen, The Netherlands |
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Abstract: | Summary In 1982 and 1983 root samples were taken by auger from potato crops grown on marine clay in the Flevo-Polder. The roots increased
their penetration depth throughout the periods of measurement, and ultimately reached depths between 80 cm and 100 cm below
the hills. Between 50 and 60 days after emergence, decay of roots commenced, starting in the upper horizons. In the hill mean
root length densities varied between 1 and 2 cm cm−3. Below the hills root density rarely exceeded 1 cm cm−3. The random variation in root density was equivalent to a coefficient of variation of 50%. There were significant effects
of the position of sampling (relative to the centre of the plant) on root density; densities were usually lowest beneath the
furrow. Depending on season and sampling date, total root length varied between 3.4 and 7.1 km m−2, and root dry mass varied between 33 and 77 g m−2. Representative figures for specific root length were 100–120 m g−1 dry weight. About 90% of the root diameters were smaller than 0.44 mm; the most frequent class (35%) were roots with diameters
between 0.12 and 0.20 mm. |
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Keywords: | Auger Clay Potato Root Root density Root diameter Root dry weight Root length Root mass Root washing Soil core |
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