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Phosphorus desorption and isotope exchange kinetics in agricultural soils

Braun, Sabina and McLaren, Timothy I. and Frossard, Emmanuel and Tuyishime, Marius and Börjesson, Gunnar and Gustafsson, Jon Petter (2022). Phosphorus desorption and isotope exchange kinetics in agricultural soils. Soil Use and Management. 38 :1 , 515-527
[Research article]

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Abstract

To improve phosphorus (P) fertilization and environmental assessments, a better understanding of release kinetics of solid-phase P to soil solution is needed. In this study, Fe (hydr)oxide-coated filter papers (Fh papers), isotopic exchange kinetics (IEK) and chemical extractions were used to assess the sizes of fast and slowly desorbing P pools in the soils of six long-term Swedish field experiments. The P desorption data from the Fh-paper extraction of soil (20 days of continual P removal) were fitted with the Lookman two-compartment desorption model, which estimates the pools of fast (Q(1)) and slowly (Q(2)) desorbing P, and their desorption rates k(1) and k(2). The amounts of isotope-exchangeable P (E) were calculated (E-1min to E->3 months) and compared with Q(1) and Q(2). The strongest relationship was found between E-1 min and Q(1) (r(2) = .87, p < .01). There was also an inverse relationship between the IEK parameter n (the rate of exchange) and k(1) (r(2) = .52, p < .01) and k(2) (r(2) = .52, p < .01), suggesting that a soil with a high value of n desorbs less P per time unit. The relationships between these results show that they deliver similar information, but both methods are hard to implement in routine analysis. However, Olsen-extractable P was similar in magnitude to Q(1) (P-Olsen = 1.1 x Q(1) + 2.3, r(2) = .96), n and k(1) were related to P-Olsen/P-CaCl2, while k(2) was related to P-oxalate/P-Olsen. Therefore, these extractions can be used to estimate the sizes and desorption rates of the different P pools, which could be important for assessments of plant availability and leaching.

Authors/Creators:Braun, Sabina and McLaren, Timothy I. and Frossard, Emmanuel and Tuyishime, Marius and Börjesson, Gunnar and Gustafsson, Jon Petter
Title:Phosphorus desorption and isotope exchange kinetics in agricultural soils
Series Name/Journal:Soil Use and Management
Year of publishing :2022
Volume:38
Number:1
Page range:515-527
Number of Pages:13
ISSN:0266-0032
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
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
Keywords:fertiliser, long term trials, modelling, phosphate, soil analysis, soil improvement, soil use and management
URN:NBN:urn:nbn:se:slu:epsilon-p-108691
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-108691
Additional ID:
Type of IDID
DOI10.1111/sum.12674
Web of Science (WoS)000589920600001
ID Code:27157
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Soil and Environment
(S) > Dept. of Soil and Environment
Deposited By: SLUpub Connector
Deposited On:21 Feb 2022 11:25
Metadata Last Modified:21 Feb 2022 11:31

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