Improving nitrogen retention of cattle slurry with oxidized biochar: An incubation study with three different soils (vol 52, pg 1, 2022)
Journal of environmental quality(2023)
摘要
The application of livestock slurry in soils can lead to nitrogen (N) losses through ammonia (NH ) emission or nitrate (NO ) leaching. Oxidized biochar has great potential to mitigate N losses due to its strong adsorption capacity; however, the effects of oxidized biochar in different soils treated with slurry are currently unclear. Here, we investigated the effect of untreated and oxidized biochar (applied at a rate of 50 kg C m slurry) on reducing N losses in a laboratory experiment with three different soils (loamy sand, sandy loam, loam) amended with cattle slurry at an application rate of 73 kg N ha . Oxidized biochar reduced NH emissions by 64-75% in all soils, whereas untreated biochar reduced NH emissions by 61% only in the loamy sand. Oxidized biochar significantly reduced the NO content in the soil solution of the loamy sand in the early phase of the incubation and led to a significantly higher NO concentration in the same soil compared with the slurry-only treatment at the end of the experiment, indicating a significant increase in NO retention in this organic C-poor soil. We conclude that oxidized biochar can reduce N losses, both in the form of NH emission and NO leaching, from cattle slurry applied to soil, particularly in soil with soil organic carbon content <1% and pH <5 (i.e., oxidized biochar can serve as a means for improving the quality of marginal and acidic soils).
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关键词
Biochar,cattle slurry,nitrogen,oxidized biochar,soil
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