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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.
- Source :
-
Plant & Soil . Jul2010, Vol. 332 Issue 1/2, p105-121. 17p. 6 Charts, 7 Graphs. - Publication Year :
- 2010
-
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. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 0032079X
- Volume :
- 332
- Issue :
- 1/2
- Database :
- Academic Search Index
- Journal :
- Plant & Soil
- Publication Type :
- Academic Journal
- Accession number :
- 51397360
- Full Text :
- https://doi.org/10.1007/s11104-009-0277-6