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vol. 6, nr. 2 (2005)
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Application of time-domain reflectometry (TDR) for determination of water uptake by root mass of corn in final vegetation stage
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Grzegorz Janik
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Institute of Environmental Development and Protection, University of Agriculture, Pl. Grunwaldzki 24, 50-363 Wrocław |
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vol. 6 (2005), nr. 2,
pp. 359-369
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abstract:
The paper demonstrates the application of the TDR method for determination of daily water uptake dynamics by corn roots. Using this method and soil moisture dynamics, one can calculate water balance in the selected spaces in the plant root layers. The balance calculated for time steps t = 1h enables one to determine the intensity of the water uptake by the whole bulk of root mass. It was revealed that the water uptake by the plant roots begins around 9 in the morning, culminates towards 12 and falls to 0 between 6 and 8 in the evening. Further, within the discussed moisture range, from 4 to 14% in the upper root layer, daily water uptake is proportional to moisture value and for a single stem is from 20 to 300 ml per day.
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keywords:
TDR method, moisture in the active soil layer, water uptake by plant roots
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original in:
Polish
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