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- Title
Phosphorus uptake by Zea mays L. is quantitatively predicted by infinite sink extraction of soil P.
- Authors
Santner, Jakob; Mannel, Martina; Burrell, Leigh; Hoefer, Christoph; Kreuzeder, Andreas; Wenzel, Walter
- Abstract
Background and aims: Sink extraction of phosphorus from soils has been utilised to study soil P desorption kinetics and as index of plant availability, but not for quantitative prediction of P uptake by plants. Here we investigate the potential of a modified sink extraction method for determining P desorption kinetics and for quantifying plant available soil P. Methods: Modified diffusive gradients in thin films samplers were immersed in shaken soil suspensions for long-term extraction of soil P. Results were evaluated in terms of P desorption kinetics and compared to the P uptake of Zea mays L. and standard soil extracts. Results: In contrast to literature reports, four of the six studied soils only showed a rapid, but not a slowly desorbing P fraction. The quantity of P desorbed by long-term sink extraction not only showed the highest correlation to plant P uptake, but also matched plant P uptake quantitatively. Conclusions: Our data indicates that soils with only a fast desorbing P fraction might exist. Sink extraction methods have the potential to quantitatively predict plant P uptake. Furthermore, they could become valuable research tools for understanding P acquisition and might serve as a benchmark for calibrating soil P tests.
- Subjects
SINKS (Atmospheric chemistry); EFFECT of phosphorus on plants; PHOSPHORUS in soils; DESORPTION kinetics; THIN films
- Publication
Plant & Soil, 2015, Vol 386, Issue 1/2, p371
- ISSN
0032-079X
- Publication type
Article
- DOI
10.1007/s11104-014-2271-x