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Assessing the abili...
Assessing the ability of soil tests to estimate labile phosphorus in agricultural soils : Evidence from isotopic exchange
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- Braun, Sabina (författare)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för mark och miljö,Department of Soil and Environment
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- Warrinnier, Ruben (författare)
- KU Leuven, Belgium
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- Börjesson, Gunnar (författare)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för mark och miljö,Department of Soil and Environment
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- Ulen, Barbro (författare)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för mark och miljö,Department of Soil and Environment
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- Smolders, Erik (författare)
- KU Leuven, Belgium
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- Gustafsson, Jon Petter, 1964- (författare)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,KTH,Vatten- och miljöteknik,Institutionen för mark och miljö,Department of Soil and Environment,Royal Institute of Technology (KTH)
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(creator_code:org_t)
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- Elsevier, 2019
- 2019
- Engelska.
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Ingår i: Geoderma. - : Elsevier. - 0016-7061 .- 1872-6259. ; 337, s. 350-358
- Relaterad länk:
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https://doi.org/10.1...
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https://www.scienced...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://res.slu.se/i...
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Abstract
Ämnesord
Stäng
- Efficient phosphorus (P) fertilization strategies are essential for intensive crop production with minimal negative environmental impacts. A key factor in sustainable P use is assessment of the plant available soil P pool using soil P tests. This study determined isotopically exchangeable P after six days of reaction with 33PO4 (P-E (6 d)) to determine how accurately two commonly used P tests, Olsen and AL (acid ammonium acetate lactate) can quantify the amount of labile P. Soil samples were taken from both highly P-amended and unamended plots at six sites within the Swedish long-term soil fertility experiments. According to P K-edge XANES spectroscopy, the P speciation was dominated by Al-bound P and organic P, with additional contributions from Fe-bound P and Ca phosphates in most soils. The results showed that the AL test overestimated P-E (6 d) by a factor of 1.70 on average. In contrast, the Olsen test underestimated P-E (6 d), with the mean ratios of P-Olsen to P-E (6 d) being 0.52 for high-P and 0.19 for low-P soils. The 33P/31P ratio in the Olsen extract of a 33PO4 spiked soil was closer to that of a 0.005 mol L−1 CaCl2 soil extract than the corresponding ratio in the AL extract, suggesting that AL extraction solubilized more non-labile P. In conclusion, the AL and Olsen methods are not suitable for direct quantification of the isotopically exchangeable soil P pool after 6 days of equilibration. However, based on the results, Olsen may be superior to AL for classification of soil P status, due to its even performance for calcareous and non-calcareous soils and lower extraction of non-labile P.
Ämnesord
- LANTBRUKSVETENSKAPER -- Annan lantbruksvetenskap (hsv//swe)
- AGRICULTURAL SCIENCES -- Other Agricultural Sciences (hsv//eng)
- LANTBRUKSVETENSKAPER -- Lantbruksvetenskap, skogsbruk och fiske -- Markvetenskap (hsv//swe)
- AGRICULTURAL SCIENCES -- Agriculture, Forestry and Fisheries -- Soil Science (hsv//eng)
Nyckelord
- Chemical analysis
- Isotopes P-33
- Isotopic exchange kinetic technique
- Phosphorus
- Soil P test
- Soils
- Chlorine compounds
- Cultivation
- Environmental impact
- Extraction
- Isotopes
- Soil testing
- X ray absorption near edge structure spectroscopy
- Agricultural soils
- Ammonium acetate
- Crop production
- IS assessment
- Isotopic exchange
- Isotopic exchange kinetics
- Noncalcareous soils
- Soil fertility
- Land and Water Resources Engineering
- Mark- och vattenteknik
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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Geoderma
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