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Space and time‐resolved monitoring of phosphorus release from a fertilizer pellet and its mobility in soil using microdialysis and x‐ray computed tomography

Space and time‐resolved monitoring of phosphorus release from a fertilizer pellet and its mobility in soil using microdialysis and x‐ray computed tomography
Space and time‐resolved monitoring of phosphorus release from a fertilizer pellet and its mobility in soil using microdialysis and x‐ray computed tomography
Phosphorus (P) is an essential nutrient for crops and precise spatiotemporal application of P fertilizer can improve plant P acquisition and reduce run-off losses of P. Optimizing application would benefit from understanding the dynamics of P release from a fertilizer pellet into bulk soil, which requires space and time-resolved measurements of P concentration in soil solution. In this study, we combined microdialysis and X-ray Computed Tomography to investigate P transport in soil. Microdialysis probes enable repeated solute sampling from one location with minimal physical disturbance, and their small dimensions permit spatially-resolved monitoring. We observed a rapid initial release of P from the source, producing high dissolved P concentrations within the first 24 hours, followed by a decrease in dissolved P over time compatible with adsorption onto soil particles. Soils with greater bulk density (i.e. reduced soil porosity) impeded the P pulse movement, which resulted in a less homogeneous distribution of total P in the soil column at the end of the experiment. Model fit to the data showed that the observed phenomena can be explained with diffusion and adsorption. Results showed that compared with conventional measurement techniques (e.g. suction cups), microdialysis measurements present a less invasive alternative. The time resolved measurements ultimately highlight rapid P dynamics that require more attention for improving P use efficiency.
Space and Time-Resolved Monitoring, Phosphorus Release, Fertilizer Pellet, Mobility in Soil, Microdialysis, X-ray Computed Tomography
0361-5995
Petroselli, Chiara
19266726-2dc0-4790-af77-7ccdc45865eb
Williams, Katherine
a13f30b4-2f53-4a14-ad38-c733923a6450
Ghosh, Arpan
2e5350a4-fc9d-498b-8746-d635bd3d2038
Mckay Fletcher, Daniel
db06e7e0-69af-4fa2-89b3-26f6599e43d4
Ruiz, Siul Aljadi
d79b3b82-7c0d-47cc-9616-11d29e6a41bd
Gerheim Souza Dias, Tiago
cbb905da-3e22-4933-8b7b-663c52345e3a
Scotson, Callum Paul
47901c28-548c-41cc-9cbd-f0429a24c7cb
Roose, Tiina
3581ab5b-71e1-4897-8d88-59f13f3bccfe
Petroselli, Chiara
19266726-2dc0-4790-af77-7ccdc45865eb
Williams, Katherine
a13f30b4-2f53-4a14-ad38-c733923a6450
Ghosh, Arpan
2e5350a4-fc9d-498b-8746-d635bd3d2038
Mckay Fletcher, Daniel
db06e7e0-69af-4fa2-89b3-26f6599e43d4
Ruiz, Siul Aljadi
d79b3b82-7c0d-47cc-9616-11d29e6a41bd
Gerheim Souza Dias, Tiago
cbb905da-3e22-4933-8b7b-663c52345e3a
Scotson, Callum Paul
47901c28-548c-41cc-9cbd-f0429a24c7cb
Roose, Tiina
3581ab5b-71e1-4897-8d88-59f13f3bccfe

Petroselli, Chiara, Williams, Katherine, Ghosh, Arpan, Mckay Fletcher, Daniel, Ruiz, Siul Aljadi, Gerheim Souza Dias, Tiago, Scotson, Callum Paul and Roose, Tiina (2020) Space and time‐resolved monitoring of phosphorus release from a fertilizer pellet and its mobility in soil using microdialysis and x‐ray computed tomography. SSSAJ Soil Science Society of America Journal. (doi:10.1002/saj2.20161).

Record type: Article

Abstract

Phosphorus (P) is an essential nutrient for crops and precise spatiotemporal application of P fertilizer can improve plant P acquisition and reduce run-off losses of P. Optimizing application would benefit from understanding the dynamics of P release from a fertilizer pellet into bulk soil, which requires space and time-resolved measurements of P concentration in soil solution. In this study, we combined microdialysis and X-ray Computed Tomography to investigate P transport in soil. Microdialysis probes enable repeated solute sampling from one location with minimal physical disturbance, and their small dimensions permit spatially-resolved monitoring. We observed a rapid initial release of P from the source, producing high dissolved P concentrations within the first 24 hours, followed by a decrease in dissolved P over time compatible with adsorption onto soil particles. Soils with greater bulk density (i.e. reduced soil porosity) impeded the P pulse movement, which resulted in a less homogeneous distribution of total P in the soil column at the end of the experiment. Model fit to the data showed that the observed phenomena can be explained with diffusion and adsorption. Results showed that compared with conventional measurement techniques (e.g. suction cups), microdialysis measurements present a less invasive alternative. The time resolved measurements ultimately highlight rapid P dynamics that require more attention for improving P use efficiency.

Text
MDdraft-sssaj_final - Accepted Manuscript
Restricted to Repository staff only until 10 September 2021.
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Text
SM-MD_final - Accepted Manuscript
Restricted to Repository staff only until 10 September 2021.
Request a copy

More information

Accepted/In Press date: 1 September 2020
e-pub ahead of print date: 10 September 2020
Keywords: Space and Time-Resolved Monitoring, Phosphorus Release, Fertilizer Pellet, Mobility in Soil, Microdialysis, X-ray Computed Tomography

Identifiers

Local EPrints ID: 443806
URI: http://eprints.soton.ac.uk/id/eprint/443806
ISSN: 0361-5995
PURE UUID: 702cafe3-f82c-4a23-be2d-6dfe42af519c
ORCID for Katherine Williams: ORCID iD orcid.org/0000-0001-6827-9261
ORCID for Daniel Mckay Fletcher: ORCID iD orcid.org/0000-0001-6569-2931
ORCID for Tiina Roose: ORCID iD orcid.org/0000-0001-8710-1063

Catalogue record

Date deposited: 14 Sep 2020 16:30
Last modified: 18 Feb 2021 17:41

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Contributors

Author: Chiara Petroselli
Author: Katherine Williams ORCID iD
Author: Arpan Ghosh
Author: Daniel Mckay Fletcher ORCID iD
Author: Tiago Gerheim Souza Dias
Author: Callum Paul Scotson
Author: Tiina Roose ORCID iD

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