Opportunities to reduce nitrous oxide emissions from horticultural production systems in Canada
Date
2021-08-03
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Publisher
Canadian Science Publishing
Abstract
Horticultural systems, specifically vegetable production systems, are considered intensive agricultural
systems as they are characterized by high nitrogen (N) fertilizer application rate, frequent tillage, and irrigation
operations. Accordingly, horticultural production in temperate climates is prone to N losses — mainly during
post-harvest (during fall and winter) or pre-plant (spring) periods — such as N2O emissions and nitrate leaching.
The risk for N losses is linked to low crop N use efficiency (NUE) combined with a narrow C:N and high N content
of crop residues. Here we reviewed the studies conducted in Canada and similar climates to better understand the
risk of N2O emission and potential agronomic management strategies to reduce N2O emissions from horticultural
systems. Current knowledge on N2O emissions from horticultural systems indicate that increasing crop NUE,
modifying the amount, type, time, and rate of N fertilizer inputs, and adopting cover crops in crop rotations are
some of the effective approaches to decrease N2O emissions. However, there is uncertainty related to the efficiency
of the existing N2O mitigation strategies due to the complex interactions between the factors (soil characteristics,
type of plant species, climatic conditions, and soil microbial activity) responsible for N2O production from soil.
Little research on N2O emissions from Canadian horticultural systems limits our ability to understand and manage
the soil N2O production processes to mitigate the risk of N2O emissions. Thus, continuing to expand this line of
research will help to advance the sustainability of Canadian horticultural cropping systems.
Description
Publication history: Accepted - 26 July 2021; Published - 3 August 2021.
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Keywords
greenhouse gas emissions, nitrogen use efficiency, vegetable, fruit, temperate climate
Citation
Chahal, I., Baral, K., Congreves, K., Van Eerd, L. and Wagner-Riddle, C. (2021) ‘Opportunities to Reduce Nitrous Oxide Emissions from Horticultural Production Systems in Canada’, Canadian Journal of Plant Science. Canadian Science Publishing. doi:10.1139/cjps-2021-0107.