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Cover crops and soil tillage differently affect N2O emissions.

Dold, C.; DeNotaris, C.; Mortensen, Esben Øster; Rasmussen, Jim and Petersen, SO (2024) Cover crops and soil tillage differently affect N2O emissions. Workshop at: XXII N Workshop, Århus, DK, 17-21 June 2024. [Submitted]

[thumbnail of CCRotate_Nworkshop_Abstract_Final.pdf] PDF - Submitted Version - English
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Summary in the original language of the document

The case study investigated the impact of different cover crops and tillage strategies on nitrous oxide (N2O) emissions in agricultural soils. Four cover crops were studied: perennial ryegrass (RG), plantain (PL), a combination of RG and PL (RG-PL), and a mix of RG, PL, and red clover (RG-PL-RC). These cover crops were terminated either by shallow rotovation followed by deeper ploughing (ro+plou) or directly by ploughing (plou). N2O flux was continuously measured using automated chambers from March to June 2021.
The study found that cumulative N2O-N emissions were generally higher for plou compared to ro+plou, with 2-to-5-fold higher emissions observed in plou for RG-PL, RG, and PL, and the smallest difference in emissions observed for RG-PL-RC. In ro+plou, the lowest and highest cumulative N2O emissions were observed in PL and RG-PL, respectively, while in plou it was RG-PL-RC and RG-PL, respectively.
The average soil nitrate (NO3-N) levels increased initially, indicating mineralization and nitrification of residue-N, but gradually decreased thereafter. This decrease in NO3-N levels corresponded with an increase in N2O emissions, suggesting denitrification as the main process of N2O production.


EPrint Type:Conference paper, poster, etc.
Type of presentation:Workshop
Agrovoc keywords:
Language
Value
URI
English
cover crops -> cover plants
http://aims.fao.org/aos/agrovoc/c_1936
English
ryegrass (lolium) -> Lolium
http://aims.fao.org/aos/agrovoc/c_4423
English
plantains (Plantago) -> Plantago
http://aims.fao.org/aos/agrovoc/c_5988
English
grass clover
http://aims.fao.org/aos/agrovoc/c_cdb03095
English
nitrous oxide
http://aims.fao.org/aos/agrovoc/c_12838
English
rotary cultivation
http://aims.fao.org/aos/agrovoc/c_24233
English
ploughing
http://aims.fao.org/aos/agrovoc/c_6021
Subjects: Soil > Nutrient turnover
Environmental aspects > Air and water emissions
Farming Systems > Farm nutrient management
Research affiliation: Denmark > Organic RDD 5 > CCRotate
Deposited By: Petersen, Dr. Søren O.
ID Code:52959
Deposited On:04 Apr 2024 08:57
Last Modified:04 Apr 2024 08:57
Document Language:English
Status:Submitted
Refereed:Submitted for peer-review but not yet accepted

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