Single and Binary Fe- and Al-hydroxides Affect Potential Phosphorus Mobilization and Transfer from Pools of Different Availability
| Autor: | Elisabeth Schütze, Dirk Freese, Stella Gypser |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Physical geography
Goethite phosphorus kinetics Inorganic chemistry Soil Science chemistry.chemical_element malic acid 010501 environmental sciences 01 natural sciences chemistry.chemical_compound Crystallinity Ferrihydrite Desorption QD1-999 Gibbsite 0105 earth and related environmental sciences Earth-Surface Processes Phosphorus 04 agricultural and veterinary sciences histidine GB3-5030 Chemistry Fe-Al-hydroxide mixtures chemistry visual_art 040103 agronomy & agriculture visual_art.visual_art_medium desorption 0401 agriculture forestry and fisheries Hydroxide Malic acid |
| Zdroj: | Soil Systems Volume 5 Issue 2 Soil Systems, Vol 5, Iss 33, p 33 (2021) |
| ISSN: | 2571-8789 |
| DOI: | 10.3390/soilsystems5020033 |
| Popis: | Phosphorus (P) fixation is a global problem for soil fertility and negatively impacts agricultural productivity. This study characterizes P desorption of already fixed P by using KCl, KNO3, histidine, and malic acid as inorganic and organic compounds, which are quite common in soil. Goethite, gibbsite, and ferrihydrite, as well as hydroxide mixtures with varying Fe- and Al-ratio were selected as model substances of crystalline and amorphous Fe- and Al-hydroxides. Especially two- and multi-component hydroxide systems are common in soils, but they have barely been included in desorption studies. Goethite showed the highest desorption in the range from 70.4 to 81.0%, followed by gibbsite with values in the range from 50.7 to 42.6%. Ferrihydrite had distinctive lower desorption in the range from 11.8 to 1.9%. Within the group of the amorphous Fe-Al-hydroxide mixtures, P desorption was lowest at the balanced mixture ratio for 1 Fe: 1 Al, increased either with increasing Fe or Al amount. Precipitation and steric effects were concluded to be important influencing factors. More P was released by crystalline Fe-hydroxides, and Al-hydroxides of varying crystallinity, but desorption using histidine and malic acid did not substantially influence P desorption compared to inorganic constituents. |
| Databáze: | OpenAIRE |
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