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Mitigation of phosphorus leaching from agricultural soils

improved fertilization and soil structure

Svanbäck, Annika (2014). Mitigation of phosphorus leaching from agricultural soils. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2014:36
ISBN 978-91-576-8020-4
eISBN 978-91-576-8021-1
[Doctoral thesis]

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Phosphorus (P) is an essential element in crop production, but P losses from agricultural soils are a major contributor to surface water eutrophication. This thesis examined the effects of chemical soil properties and soil structure, as governed by agricultural management practices, on P leaching from agricultural soils and how this leaching can be reduced. An initial investigation on the effect of plant-available P concentration in the soil (P-AL) on topsoil P leaching from five soils clearly showed that topsoil P leaching depends not only on P status, but also on other soil characteristics. In three of these soils, increased P leaching after manure application was further amplified by high P-AL, while manure application did not affect topsoil P leaching in the other two soils.

In a study assessing different management practices on a clay soil and the possible effect on P losses via tile drains, great spatial variation in P leaching was observed in the field, even though P-AL and discharge volume were relatively uniform across the field. Incorporation of quicklime (CaO) significantly reduced P leaching losses, primarily of particulate P, which was the dominant P form in drainage water. The other management options evaluated (conventional ploughing/shallow tillage; no P application/balanced P application; broadcasting/band spreading of fertilizer P) had no significant effects on P leaching. However, some effects of these management strategies could have been overshadowed by the large spatial variation in the data.

Stopping P application and removing soil P with harvested crops (phytomining) showed potential to reduce excessive P levels in soils. After 7-9 years of no P application to the four soils studied, topsoil P-AL was lowered but most soils still had excessive levels. Only one soil, a clay soil with the lowest P-AL value in the study, showed a significant downward trend in leaching of dissolved reactive P.

New knowledge outcomes were that: (i) the relationship between P-AL and topsoil P leaching clearly differs between soils, especially after manure application; (ii) incorporation of quicklime is a promising option for reducing P leaching from clay soils; and (iii) high P-AL values and P leaching may be reduced after phytomining, but this mitigation strategy takes a very long time.

Authors/Creators:Svanbäck, Annika
Title:Mitigation of phosphorus leaching from agricultural soils
Subtitle:improved fertilization and soil structure
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2014
Number of Pages:66
I.Svanbäck A., B. Ulén, A. Etana., L. Bergström, P.J.A. Kleinman & L. Mattsson (2013). Influence of soil phosphorus and manure on phosphorus leaching in Swedish topsoils. Nutrient Cycling in Agroecosystems 96, 133-147.
II.Svanbäck A., B. Ulén & A. Etana (2014). Mitigation of phosphorus leaching losses via subsurface drains from a cracking marine clay soil. Agriculture, Ecosystems and Environment 184, 124-134.
III.Svanbäck A., B. Ulén, L. Bergström & P.J.A. Kleinman (2014). Long-term trends in phosphorus leaching and changes in soil phosphorus with 'phytomining'. Submitted manuscript.
Place of Publication:Uppsala
Publisher:Department of Soil and Environment, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-576-8020-4
ISBN for electronic version:978-91-576-8021-1
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:F Plant production > F04 Fertilizing
P Natural resources > P33 Soil chemistry and physics
P Natural resources > P35 Soil fertility
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:phosphorus, leaching, agricultural soils, soil types, soil chemicophysical properties, liming, fertilizer application, farmyard manure, tillage, top soil, harvesting, subsurface drainage, soil analysis, sweden
Keywords:phosphorus leaching, mitigation options, soil test P
Permanent URL:
ID Code:11171
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Soil and Environment
(S) > Dept. of Soil and Environment
Deposited By: Annika Svanbäck
Deposited On:12 May 2014 13:34
Metadata Last Modified:13 Dec 2014 19:57

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