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Assessing potassium...
Assessing potassium reserves in northern temperate grassland soils: A perspective based on quantitative mineralogical analysis and aqua-regia extractable potassium
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- Andrist Rangel, Ylva (författare)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för mark och miljö,Department of Soil and Environment
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- Öborn, Ingrid (författare)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för växtproduktionsekologi,Department of Crop Production Ecology
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- Hillier, Stephen (författare)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för mark och miljö,Department of Soil and Environment
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(creator_code:org_t)
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- Elsevier BV, 2010
- 2010
- Engelska.
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Ingår i: Geoderma. - : Elsevier BV. - 0016-7061 .- 1872-6259. ; 158, s. 303-314
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https://res.slu.se/i...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Increasing demand for locally produced farm products, with a lower input of mineral fertilisers, leads to a greater reliance on the inherent capacity of soils to supply plant nutrients. Typically 98% of all soil potassium (K) is found in K-feldspars and phyllosilicates, however the potential bioavailability of K from different mineral forms varies significantly. As a basis for improving sustainable nutrient management options for grassland systems we set out to determine 1) how soil parent material influences the amount of K in soils, 2) how the K is quantitatively distributed between mineral groups, 3) relationships between quantitative mineralogy (X-ray powder diffraction (XRPD)), total K (X-ray fluorescence) and the more widely available measurement of aqua-regia extractable K, and (4) how the studied soils could be ranked in terms of their long-term potential capacity to deliver K to plants. Soils representing eight of the most extensive soil associations (defined by different parent materials) under improved grassland in Scotland were analysed. Soil samples represented a wide range of total K concentrations, from 1.3 to 39 g kg(-1). Quantitative mineralogical data from XRPD were combined with mineral compositions to obtain the mineralogical apportionment of K. Apportionment of K varied significantly, from those soils with almost all K present in various phyllosilicates to others where almost all K is held in K-feldspars. Aqua-regia extractable K is related to K in phyllosilicates (excluding muscovite mica) and unrelated to K in K-feldspars. The studied soils are ranked in terms of their potential capacity to release K based on their mineralogical and geochemical characteristics. (C) 2010 Elsevier B.V. All rights reserved.
Ämnesord
- LANTBRUKSVETENSKAPER -- Lantbruksvetenskap, skogsbruk och fiske -- Jordbruksvetenskap (hsv//swe)
- AGRICULTURAL SCIENCES -- Agriculture, Forestry and Fisheries -- Agricultural Science (hsv//eng)
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- art (ämneskategori)
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Geoderma
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