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Evaluating the effe...
Evaluating the effectiveness of the phosphorus sorption index for estimating maximum phosphorus sorption capacity
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- Blombäck, Karin (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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- 2020-06-02
- 2020
- Engelska.
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Ingår i: Soil Science Society of America Journal. - : Wiley. - 0361-5995 .- 1435-0661. ; 84, s. 994-1005
- Relaterad länk:
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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
- The single‐point P sorption index (PSI), which is defined as the ratio of sorbed P (S) to the log P concentration in soil solution following a single P addition, is often used to estimate maximum soil P sorption capacity (Smax). Although studies have found good correlations between PSI and Smax as determined from fitting the Langmuir model to complete sorption isotherm data, a thorough analysis of the role of added P concentration on this relationship is needed. Our first objective was to investigate the effect of added P concentration on the correlation between PSI and Smax as determined by the Langmuir equation. Our second objective was to determine if S was better than PSI for predicting Smax. Using numerical simulations, we tested the correlation between Smax and PSI for added P concentrations of 75, 100, 150, and 200 mg P L−1. Results of the simulations show that the strength of the correlation between Smax and PSI increases with increasing P concentration. Our results also show that PSI was a better predictor of Smax than S for added concentrations of 75 and 100 mg P L−1, whereas at the higher rates S was a slightly better predictor of Smax and gave a direct estimate of Smax rather than the relative estimate obtained from PSI. Results from P sorption data measured on soils from Maryland and Sweden were consistent with our results from the numerical simulations. Our findings highlight important limitations of using PSI for estimating Smax.
Ämnesord
- LANTBRUKSVETENSKAPER -- Lantbruksvetenskap, skogsbruk och fiske -- Markvetenskap (hsv//swe)
- AGRICULTURAL SCIENCES -- Agriculture, Forestry and Fisheries -- Soil Science (hsv//eng)
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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