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Strong potential of slurry application timing and method to reduce N losses in a permanent grassland

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  • Stefania Codruta Maris, Catholic University of the Sacred Heart
  • ,
  • Diego Abalos
  • Federico Capra, Catholic University of the Sacred Heart
  • ,
  • Giuseppe Moscatelli, Research Centre on Animal Production (CRPA)
  • ,
  • Fabio Scaglia, Catholic University of the Sacred Heart
  • ,
  • German Eduardo Cely Reyes, Universidad Pedagogica y Tecnologica de Colombia
  • ,
  • Federico Ardenti, Catholic University of the Sacred Heart
  • ,
  • Roberta Boselli, Catholic University of the Sacred Heart
  • ,
  • Andrea Ferrarini, Catholic University of the Sacred Heart
  • ,
  • Paolo Mantovi, Research Centre on Animal Production (CRPA)
  • ,
  • Vincenzo Tabaglio, Catholic University of the Sacred Heart
  • ,
  • Andrea Fiorini, Catholic University of the Sacred Heart

Livestock manure is a major source of nitrogen (N) for plants, but also of ammonia (NH3) and nitrous oxide (N2O) emissions to the atmosphere, and nitrate (NO3) leaching to groundwater. Slurry application practices targeted at reducing each of these N losses individually are relatively well known. Yet, our understanding of the potential relationships between N loss pathways is far from being complete. In this field study on grassland, we tested the effect of slurry application timing (autumn vs. winter vs. spring) and method (injection vs. broadcasting) and their interactions on N2O emissions, NH3 volatilization and NO3 leaching, as well as on plant N uptake. We found that autumn application increased NO3 leaching by 65 % compared with winter and spring due to 63 % higher rainfall following application. On average, autumn application reduced plant N uptake by 26 %. N2O emissions after winter slurry application were 43 % higher that after either spring or autumn applications. Slurry application method had no effect on NO3 leaching. Slurry injection led to 32 % higher N2O emissions compared with broadcast application. Slurry injection decreased NH3 volatilization only in autumn when the soil was relatively dry before application, but not in winter or spring when the soil was wet. Changes in slurry application timing led to variations in total N losses of up to 146 %, and application method of up to 19 %, highlighting the great potential of slurry application practices to steer an efficient N management. Overall, autumn application should be avoided to promote more sustainable grassland production; however, if slurry must be applied in autumn, injection should be recommended to reduce NH3 volatilization.

Original languageEnglish
Article number107329
JournalAgriculture, Ecosystems and Environment
Volume311
Number of pages13
ISSN0167-8809
DOIs
Publication statusPublished - May 2021

Bibliographical note

Publisher Copyright:
© 2021 Elsevier B.V.

Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.

    Research areas

  • Ammonia volatilization, Application method and timing, Grasslands, Nitrate leaching, Nitrous oxide emissions, Slurry

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