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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Abstract
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 | ||||||||
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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: | 2014:36 | ||||||||
Number of Pages: | 66 | ||||||||
Papers/manuscripts: |
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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 | ||||||||
ISSN: | 1652-6880 | ||||||||
Language: | English | ||||||||
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 | ||||||||
URN:NBN: | urn:nbn:se:slu:epsilon-e-1890 | ||||||||
Permanent URL: | http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-1890 | ||||||||
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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