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  • Title: Nitrogen leaching losses following biogas slurry irrigation to purple soil of the Three Gorges Reservoir Area.
    Author: Cheng J, Chen Y, He T, Liu R, Yi M, Yang Z.
    Journal: Environ Sci Pollut Res Int; 2018 Oct; 25(29):29096-29103. PubMed ID: 30112641.
    Abstract:
    Ammonium (NH4+) in biogas slurries is readily nitrified into very mobile soil nitrate (NO3-) to promote nitrogen (N) leaching concerning which a few studies, however, have been reported. These slurries are regularly applied through irrigation to purple soil in the Three Gorges Reservoir Area, and therefore we explored the consequent N leaching there with a plot experiment. Biogas slurry irrigation was carried out with nitrogen application rates of 0, 48, 144, 240, 336, and 480 kg N/ha. As a result, the last two rates have triggered N leaching being detrimental to groundwater safety. In addition, N leaching was negatively correlated with soil microbial biomass, diversity, and respiration, indicating a potential technique to prevent it with soil heterotrophs activated by increased ratios of carbon to nitrogen (C/N) in biogas slurries.
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