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Biochar application increases sorption of nitrification inhibitor 3,4-dimethylpyrazole phosphate in soil

Author:
Keiblinger, KatharinaM., Zehetner, Franz, Mentler, Axel, Zechmeister-Boltenstern, Sophie
Source:
Environmental science and pollution research international 2018 v.25 no.11 pp. 11173-11177
ISSN:
0944-1344
Subject:
agricultural land, ammonium, biochar, climate change, emissions, feedstocks, hydrophobicity, models, nitrates, nitrification inhibitors, nitrous oxide, nutrient use efficiency, oxidation, phosphates, pyrolysis, soil, soil fertility, sorption, temperature
Abstract:
Biochar (BC) application to soils is of growing interest as a strategy to improve soil fertility and mitigate climate change. However, BC-induced alterations in the soil N cycle are currently under debate. BC has recently been shown to accelerate the emissions of N₂O via the biotic ammonium oxidation pathway, which results in lower nitrogen use efficiency and environmentally harmful losses of NO₃ and/ or N₂O. To avoid these potential losses, the use of nitrification inhibitor (NI) could provide a useful mitigation strategy for BC-amended agricultural fields. Here, we tested the sorption behavior of a model NI, the synthetic 3,4-dimethylpyrazole phosphate (DMPP) on 15-month-aged soil-BC mixtures. We saw that BC additions increased DMPP sorption to varying extents depending on BC feedstock type and pyrolysis temperature. The highest sorption was found for BC pyrolyzed at a lower temperature. BC effects on soil physico-chemical characteristics (i.e., hydrophobicity) seem to be important factors.
Agid:
5929114