Potassium uptake efficiency and dynamics in the rhizosphere of maize (Zea mays L.), wheat (Triticum aestivum L.), and sugar beet (Beta vulgaris L.) evaluated with a mechanistic model |
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Authors: | Debasmita Samal John L Kovar Bernd Steingrobe Upkar S Sadana Pratapbhanu S Bhadoria Norbert Claassen |
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Affiliation: | 1. Department of Crop Science, Plant Nutrition Section, Carl-Sprengel-Weg 1, G?ttingen, 37075, Germany 3. Agricultural and Food Engineering Department, Indian Institute of Technology, Kharagpur, 721302, India 2. National Laboratory for Agriculture and the Environment, 2110 University Boulevard, Ames, IA, 50011-3120, USA
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Abstract: | Plant species differ in nutrient uptake efficiency. With a pot experiment, we evaluated potassium (K) uptake efficiency of maize (Zea mays L.), wheat (Triticum aestivum L.), and sugar beet (Beta vulgaris L.) grown on a low-K soil. Sugar beet and wheat maintained higher shoot K concentrations, indicating higher K uptake efficiency. Wheat acquired more K because of a greater root length to shoot dry weight ratio. Sugar beet accumulated more shoot K as a result of a 3- to 4-fold higher K influx as compared to wheat and maize, respectively. Nutrient uptake model NST 3.0 closely predicted K influx when 250 mg K kg?1 were added to the soil, but under-predicted K influx under low K supply. Sensitivity analysis showed that increasing soil solution K concentration (CLi) by a factor of 1.6–3.5 or buffer power (b) 10- to 50-fold resulted in 100% prediction of K influx. When both maximum influx (Imax) and b were increased by a factor of 2.5 in maize and wheat and 25 in sugar beet, the model could predict measured K influx 100%. In general, the parameter changes affected mostly calculated K influx of root hairs, demonstrating their possible important role in plant K efficiency. |
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