Pedosphere 27(2): 318--327, 2017
ISSN 1002-0160/CN 32-1315/P
©2017 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Greenhouse gas emissions and growth of wheat cultivated in soil amended with digestate from biogas production
1PhD Program on Science, Technology and Society, Cinvestav, IPN 2508, Mexico DF 07360 (Mexico)
2 Laboratory of Soil Ecology, Laboratorio de Matemáticas Aplicadas y Cómputo de Alto Rendimiento, Cinvestav-Edomex (ABACUS), Cinvestav, IPN 2508, Mexico DF 07360 (Mexico)
3 Department of Chemistry, Unidad Profesional Interdisciplinaria de Biotecnología-Instituto Politécnico Nacional (UPIBI-IPN), Me- xico DF 07340 (Mexico)
4 Sustainability of Natural Resources and Energy Program, Cinvestav-Saltillo 1062, Coahuila 25900 (Mexico)
5 Department of Biotechnology and Biochemistry, Cinvestav, Irapuato 36821 (Mexico)
      Digestate, the product obtained after anaerobic digestion of organic waste for biogas production, is rich in plant nutrients and might be used to fertilize crops.Wheat ( Triticum spp. L.) was fertilized with digestate, urea, or left unfertilized and cultivated in the greenhouse for 120 d.Emissions of greenhouse gasses (carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O)) were monitored and plant growth characteristics were determined at harvest. The digestate was characterized for heavy metals, pathogens, and C and N mineralization potential in an aerobic incubation experiment.No Salmonella spp., Shigella spp., or viable eggs of helminths were detected in the digested pig slurry, but the number of faecal coliforms was as high as 3.6 times 104 colony-forming units (CFU) g-1 dry digestate. The concentrations of heavy metals did not surpass the upper limits established by US Environmental Protection Agency (EPA).After 28 d, 17% of the organic C (436 g kg-1 dry digestate) and 8% of the organic N (6.92 g kg-1 dry digestate) were mineralized. Emissions of CO2 and CH4 were not significantly affected by fertilization in the wheat-cultivated soil, but digestate significantly increased the cumulative N2O emission by 5 times compared to the urea-amended soil and 63 times compared to the uncultivated unfertilized soil.It could be concluded that digestate was nutrient rich and low in heavy metals and pathogens, and did not affect emissions of CH4 and CO2 when applied to a soil cultivated with wheat, but increased emission of N2O.
Key Words:  biodigester, C and N mineralization potential, faecal coliform, heavy metal, pathogen, pig slurry
Citation: Liliana PAMPILLÓN-GONZÁLEZ, Marco, L. G., Victor Manuel RUÍZ-VALDIVIEZO, Olivia, F. H., Fabián FERNÁNDEZ-LUQUE\NO, Octavio PAREDES-LÓPEZ, Gerardo HERNÁNDEZ and Luc, D. 2017. Greenhouse gas emissions and growth of wheat cultivated in soil amended with digestate from biogas production. Pedosphere. 27(2): 318-327.
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