Comparative effects of partial root-zone drying and deficit irrigation on nitrogen uptake in potatoes (<Emphasis Type="Italic">Solanum tuberosum</Emphasis> L.) |
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Authors: | Huiqun Wang Fulai Liu Mathias N Andersen Christian R Jensen |
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Institution: | 1.Department of Agriculture and Ecology, Faculty of Life Sciences,University of Copenhagen,Taastrup,Denmark;2.Hunan Provincial Key Laboratory of Phytohormones and Growth Development,Hunan Agricultural University,Changsha,China;3.Department of Agroecology and Environment, Faculty of Agricultural Sciences,University of Aarhus,Tjele,Denmark |
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Abstract: | The effects of partial root-zone drying (PRD) as compared with deficit irrigation (DI) and full irrigation (FI) on nitrogen
(N) uptake and partitioning in potato (Solanum tuberosum L.) were investigated. Potato plants were grown in split-root pots and were exposed to FI, PRD, and DI treatments at tuber
bulking stage. Just before onset of the irrigation treatment, each plant received 0.6 g N (in the form of urea) with 5% of
which was 15N-labeled. After 4 weeks of irrigation treatments (i.e., one drying/wetting cycles completed in the PRD treatment), the plants
were harvested and plant dry mass and N content were determined. The results showed that although the plant dry mass was not
affected by the irrigation treatments, due to a reduced water use by the plant, both the PRD and DI treatments significantly
increased crop water use efficiency. Compared with the FI and DI plants, PRD plants had significantly higher N contents in
the leaves, stems and tubers; whereas, the 15N content in the plant organs was similar for the FI, PRD, and DI plants. It is suggested that not the root N uptake efficiency
but the soil N availability was enhanced by the PRD treatment. |
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