Home About Browse Search
Svenska


Mitigation of phosphorus leaching losses via subsurface drains from a cracking marine clay soil

Svanbäck, Annika and Ulen, Barbro and Etana, Ararso (2014). Mitigation of phosphorus leaching losses via subsurface drains from a cracking marine clay soil. Agriculture, ecosystems & environment. 184, 124-134
[Journal article]

[img]
Preview
PDF - Published Version
Available under License Creative Commons Attribution Non-commercial No Derivatives.

797kB

Official URL: http://dx.doi.org/10.1016/j.agee.2013.11.017

Abstract

In Scandinavia, subsurface transport via tile drains contributes significantly to phosphorus (P) and nitrogen (N) leaching from arable land, which adds to the eutrophication of surface waters. Using flow-proportional water sampling, various options for mitigating subsurface P leaching losses (and N leaching) were examined in 28 experimental plots on a flat, tile-drained site with 60% marine clay. Two crop rotations and unfertilised fallow were monitored for a total of six years. In addition to topsoil management practices (different forms of tillage, structural liming and mineral P fertilisation), local spatial variations in subsurface transport were determined within the experimental area.
Mean total P (TotP) leaching losses after conventional autumn ploughing and inverting the soil to a depth of 23 cm were 0.79 kg ha-1 year-1, with 87% occurring as particulate P (PP), and the corresponding mean total N leaching losses were 27 kg ha-1 year-1, with 91% occurring as nitrate. The coefficient of variation in TotP leaching both in spring before the experiment started (64%) and during the six-year experiment (60%) was higher than the coefficient of variation in P-soil status (20%), or drainage (25%), illustrating the importance of local-scale subsurface transport in this cracking clay. However, TotP and PP leaching losses were significantly (pr>F< 0.002) lower from plots with structural liming than from the other treatments grouped together. Different P fertilisation strategies (band-spreading/broadcasting of mineral P and applying a balanced amount/no P fertiliser) had no significant effect on P leaching losses. Nitrogen leaching was significantly (pr>F <0.001) lower from unfertilised fallow than from other treatments and was not significantly lower after shallow autumn tillage than after conventionally ploughing, whereas PP losses tended to be higher. Infiltration measurements with tension infiltrometers revealed a high variation in saturated hydraulic conductivity within plots. In view of the generally high PP losses, efforts to combat eutrophication of the nearby Baltic Sea should concentrate on soil structure improvements, while extensive tillage and totally omitting P fertilisation of cracking soils with low soil P status appears to be inefficient mitigation options.

Authors/Creators:Svanbäck, Annika and Ulen, Barbro and Etana, Ararso
Title:Mitigation of phosphorus leaching losses via subsurface drains from a cracking marine clay soil
Series/Journal:Agriculture ecosystems & environment (0167-8809)
Year of publishing :2014
Volume:184
Page range:124-134
Publisher:Elsevier
ISSN:0167-8809
Language:English
Additional Information:Published with permisson of Elsevier.
Publication Type:Journal article
Refereed:Yes
Article category:Scientific peer reviewed
Version:Published version
Full Text Status:Public
Agris subject categories.:P Natural resources > P30 Soil science and management
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Environmental Sciences (social aspects to be 507)
(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
Agrovoc terms:Leaching, Phosphorus, Soil cracking
Keywords:subsurface leaching, mitigation, particulate phosphorus, preferential flow, cracking soil
URN:NBN:urn:nbn:se:slu:epsilon-e-1859
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-1859
ID Code:11123
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: Annika Svanbäck
Deposited On:14 Apr 2014 12:16
Metadata Last Modified:22 Apr 2016 08:00

Repository Staff Only: item control page

Downloads

Downloads per year (since September 2012)

View more statistics

Downloads
Hits