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The role of subsoil properties for phosphorus leaching in agricultural soils

Andersson, Helena (2016). The role of subsoil properties for phosphorus leaching in agricultural soils. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae, 1652-6880 ; 2016:9
ISBN 978-91-576-8520-9
eISBN 978-91-576-8521-6
[Doctoral thesis]

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Abstract

Phosphorus (P) leaching from agricultural land is a large contributor to eutrophication of many surface waters and the Baltic Sea. Better knowledge of P sorption and release in the subsoil could enable the development of effective mitigation strategies for P leaching. This thesis examined the impact of soil properties on P leaching from four Swedish agricultural soils (two clays, two sands), using intact soil columns extracted with (length 1.05 m) and without (length 0.77 m) topsoil. The role of the subsoil as a source or sink for P leaching was also investigated, and placement of quicklime (CaO) on top of the subsoil as a mitigation strategy for P leaching was evaluated.

Leaching of dissolved reactive P (DRP) from subsoil lysimeters was 94% of that from full-length lysimeters in one of the clay soils, and 70% in the other. The higher contribution of the former clay subsoil was probably due to high P content deeper in the soil. Leaching of DRP was low from full-length and subsoil lysimeters (0.12 and 0.08 kg ha-1 yr-1, respectively) in one of the sandy soils, despite high topsoil P content, due to high P sorption capacity and low degree of P saturation in the subsoil. However, leaching of DRP was very high from full-length and subsoil lysimeters (3.33 and 3.29 kg ha-1 yr-1, respectively) from the other sandy soil with moderate topsoil P content, due to high P content and low P sorption capacity in the subsoil. These results indicate that the subsoil can function as both a source and sink for P leaching.

Phosphorus leaching increased with increasing P content and DPS in subsoil and decreasing P sorption capacity in topsoil and subsoil, indicating that these parameters could be used for P leaching risk assessments. However, on soils with preferential flow in the subsoil, P leaching may be high despite high subsoil P sorption capacity. Hence, both chemical and physical properties of topsoil and subsoil must be considered in implementation of appropriate, cost-effective mitigation strategies for P loss reductions.

Application of lime on top of the subsoil significantly reduced leaching of particulate P (PP) in both clay subsoils by 49 and 51%, respectively, compared with unlimed controls. This suggests that subsoil liming might be an appropriate method to reduce P leaching from clay soils.

Authors/Creators:Andersson, Helena
Title:The role of subsoil properties for phosphorus leaching in agricultural soils
Series/Journal:Acta Universitatis agriculturae Sueciae (1652-6880)
Year of publishing :February 2016
Depositing date:9 February 2016
Volume:2016:9
Number of Pages:56
Papers/manuscripts:
NumberReferences
IAndersson, H., L. Bergström, F. Djodjic, B. Ulén and H. Kirchmann (2013). Topsoil and subsoil properties influence phosphorus leaching from four agricultural soils. Journal of Environmental Quality 42 (2), 455-463.
IIAndersson, H., L. Bergström, B. Ulén, F. Djodjic and H. Kirchmann (2015). The role of subsoil as a source or sink for phosphorus leaching. Journal of Environmental Quality 44 (2), 535-544.
IIIAndersson, H., L. Bergström, F. Djodjic, B. Ulén and H. Kirchmann (2016). Lime placement on subsoil as a strategy to reduce phosphorus leaching from agricultural soils. Submitted manuscript.
Place of Publication:Uppsala
Publisher:Department of Soil and Environment, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-576-8520-9
ISBN for electronic version:978-91-576-8521-6
ISSN:1652-6880
Language:English
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:P Natural resources > P30 Soil science and management
P Natural resources > P33 Soil chemistry and physics
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Agricultural Science
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Soil Science
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 405 Other Agricultural Sciences > Environmental Sciences related to Agriculture and Land-use
Agrovoc terms:agricultural soils, phosphorus, leaching, subsoil, soil chemicophysical properties, sorption, liming, lysimeters, sweden
Keywords:phosphorus leaching, subsurface drainage, subsoil, lysimeter, mitigation option, phosphorus sorption, lime
URN:NBN:urn:nbn:se:slu:epsilon-e-3212
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-3212
ID Code:13033
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Soil and Environment
(S) > Dept. of Soil and Environment
External funders:Stiftelsen Lantbruksforskning
Deposited By: Helena Andersson
Deposited On:09 Feb 2016 09:16
Metadata Last Modified:17 Feb 2016 16:58

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