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Comparing measures ...
Comparing measures for determination of phosphorus saturation as a method to estimate dissolved P in soil solution
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- Blombäck, Karin (author)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för mark och miljö,Department of Soil and Environment,Swedish Univ Agr Sci, Dept Soil & Environm, POB 7014, SE-75007 Uppsala, Sweden
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- Bolster, Carl H. (author)
- USDA ARS, Food Anim Environm Syst Res Unit, 2413 Nashville Rd B-5, Bowling Green, KY 42101 USA
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- Lindsjö, Anders (author)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för mark och miljö,Department of Soil and Environment,Swedish Univ Agr Sci, Dept Soil & Environm, POB 7014, SE-75007 Uppsala, Sweden
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- Hesse, Kathrin (author)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för mark och miljö,Department of Soil and Environment,Swedish Univ Agr Sci, Dept Soil & Environm, POB 7014, SE-75007 Uppsala, Sweden
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- Linefur, Helena (author)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för mark och miljö,Department of Soil and Environment,Swedish Univ Agr Sci, Dept Soil & Environm, POB 7014, SE-75007 Uppsala, Sweden
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- Parvage, Mohammed Masud (author)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Uppsala universitet,Luft-, vatten- och landskapslära,Swedish Univ Agr Sci, Dept Soil & Environm, POB 7014, SE-75007 Uppsala, Sweden,Institutionen för mark och miljö,Department of Soil and Environment,Uppsala University
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- Elsevier, 2021
- 2021
- English.
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In: Geoderma. - : Elsevier. - 0016-7061 .- 1872-6259. ; 383
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Abstract
Subject headings
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- In response to concerns over the translocation of P from soils to P-sensitive water bodies, there is high demand for developing simple indicators for evaluating a soil’s risk of releasing P into solution. Many studies have shown that the degree of soil phosphorus saturation (DPS), calculated as the ratio of soil P concentration to soil P sorption capacity (PSC), is good predictor of a soil’s risk of releasing P in solution. In this study we compared four different DPS indices in how well they predicted dissolved P following extraction with either a 0.01 M CaCl2 (PCaCl2) solution or deionized water (PW). The first two indices were calculated from the ratio of extractable P to extractable Al and Fe using either acid ammonium oxalate (AlOX + FeOX) or ammonium lactate solutions (AlAL + FeAL). The second two DPS indices were calculated from the ratio of either Olsen-extractable P or AL-extractable P with sorption capacity estimated from the single point P sorption index (PSI). On a subset of 11 soils, we compared the different methods for estimating PSC with fitted Langmuir sorption maximum (Smax) using data from complete sorption isotherms. Both (AlOX + FeOX) and PSI were well correlated with Smax and hence regarded as good estimates for P sorption capacity. Conversely, (AlAL + FeAL) was not significantly correlated with Smax. P saturation calculated from PSI together with PAL or POls predicted PCaCl2 and PW best, whereas P saturation calculated from ammonium oxalate predicted PCaCl2 and PW the least. We did not find notable improvements in the regression models when we added a second explanatory variable (clay content, pH or total carbon) to the models. Our results show that multiple measures of P saturation provide similar predictions of a soiĺs potential for releasing dissolved P into soil solution. This provides flexibility in how P saturation indices are calculated to identify leaching prone hotspots.
Subject headings
- LANTBRUKSVETENSKAPER -- Lantbruksvetenskap, skogsbruk och fiske -- Markvetenskap (hsv//swe)
- AGRICULTURAL SCIENCES -- Agriculture, Forestry and Fisheries -- Soil Science (hsv//eng)
Keyword
- Degree of phosphorus saturation
- Phosphorus sorption capacity
- Ammonium lactate extraction
- Ammonium oxalate extraction
- Sorption isotherms
- PSI
Publication and Content Type
- ref (subject category)
- art (subject category)
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