Biology and Fertility of Soils

, Volume 49, Issue 7, pp 971–976 | Cite as

Nitrous oxide flux from komatsuna (Brassica rapa) vegetated soil: a comparison between biogas digested liquid and chemical fertilizer

  • Ankit Singla
  • Suresh K. Dubey
  • Hirokuni Iwasa
  • Kazuyuki Inubushi
Short Communication


Biogas production generates digested slurry as a by-product. It can be used as fertilizer especially after its conversion into digested liquid. A microcosm-based study was conducted in order to compare the effects of single application of digested liquid or chemical fertilizer on N2O flux and crop yield of komatsuna vegetable. Analysis revealed that digested liquid-treated soils released almost equal cumulative N2O (0.43 g N m−2) compared to chemical fertilizer (0.39 g N m−2). The uncropped soils treated with the digested liquid and chemical fertilizer released more N2O compared to corresponding cropped soils. The N2O emission factor and soil mineral N contents were similar for the digested liquid and chemical fertilizer-treated soils. Plant biomass in the first crop after digested liquid application was significantly higher (5.59 g plant−1) than that after applied chemical fertilizer (4.78 g plant−1); but there was no significant difference for the second crop. Nitrogen agronomic efficiency was improved by the digested liquid compared to chemical fertilizer. This study indicates that cumulative N2O flux was similar after application of the digested liquid and chemical fertilizer, while the overall yield from both croppings was increased in the digested liquid-treated soil compared to chemical fertilizer-treated soil.


Digested liquid Chemical fertilizer N2O flux Crop yield 



This research work was financially supported by the Indian Council of Agricultural Research (ICAR), New Delhi, India, under the International Fellowship Scheme. We are thankful to the anonymous reviewers for their critical comments and constructive suggestions. SKD thanks the Japan Society for the Promotion of Science (JSPS) for his support during the visit to Chiba University, Japan, as a JSPS Fellow.

Conflict of interest

The authors have no conflict of interest.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Ankit Singla
    • 1
  • Suresh K. Dubey
    • 1
    • 2
  • Hirokuni Iwasa
    • 1
    • 3
  • Kazuyuki Inubushi
    • 1
  1. 1.Graduate School of HorticultureChiba UniversityMatsudoJapan
  2. 2.Department of BotanyBanaras Hindu UniversityVaranasiIndia
  3. 3.Chiba Prefectural Agricultural and Forestry Research CenterChibaJapan

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