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Amorphous Silica Controls Water Storage Capacity and Phosphorus Mobility in Soils

Title data

Schaller, Jörg ; Frei, Sven ; Rohn, Lisa ; Gilfedder, Benjamin Silas:
Amorphous Silica Controls Water Storage Capacity and Phosphorus Mobility in Soils.
In: Frontiers in Environmental Science. Vol. 8 (2020) .
ISSN 2296-665X
DOI: https://doi.org/10.3389/fenvs.2020.00094

Abstract in another language

Two problems currently facing agriculture are drought and the availability of mineable phosphorus minerals used for fertilization. More frequent and longer drought periods are predicted to threaten agricultural yields in the future. The capacity of soils to hold water is a highly important factor controlling drought stress of plants during the growing phase. High phosphorus availability in soils is also necessary for high agricultural yields, however over application has also led to a range of environmental problems, foremost being the eutrophication of waterways. Amorphous silica (ASi) has been suggested as one solution to mitigate both water and phosphorus availability. In this work we analyzed the effect of ASi on phosphorus mobility and the soil water storage of a sandy soil. In a lysimeter experiment we found that ASi strongly increased the water storage capacity of soils (up to 180 % by addition of 3 wt. % ASi). Furthermore, the ASi is in direct competition with phosphorus for sorption sites on iron oxides and other soil minerals increasing nutrient mobilization and increasing potential bioavailability for plants. Following calibration to the lysimeter experiment a process based hydrological model was used to extrapolate experimental results to a sandy agricultural soil with and without ASi for one year. For the soil with ASi, the water storage capacities for the yearly scenario were up to 40 kg/m² higher compared to the untreated soil. Our results suggest that ASi enhances the water storage capacity and phosphorus mobility in soil and that this may be one way to mitigate the predicted climate change related drought stress in sandy soils.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Hydrology > Chair Hydrology - Univ.-Prof. Dr. Stefan Peiffer
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Professor Environmental Geochemistry Group
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 550 Earth sciences, geology
Date Deposited: 14 Aug 2020 06:23
Last Modified: 14 Aug 2020 06:23
URI: https://eref.uni-bayreuth.de/id/eprint/56514