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27 January 2025 Precipitation and nitrogen management are key drivers of cropping system productivity in the Canadian prairies
Guoqi Wen, Kui Liu, Hiroshi Kubota, Gary Peng, Greg Semach, Prabhath Lokuruge, Henry Wai Chau, Mohammad Khakbazan
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Abstract

The performance of cropping systems is a function of crop and management practice interaction in a given growing environment. However, the critical factors affecting productivity remains unclear under varying climate conditions. We conducted a 5 year study at six sites in western Canada to identify the critical factors affecting the productivity, standardized as protein-based yield (PBY), and quantify the relationships between yield and critical factors. We tested six crop rotations, including conventional system (Control), pulse- or oilseed-intensified system (Intensified), diversified system (Diversified), market-driven system (Market-driven), high-risk and potentially high reward system (High-risk), and soil-health enhanced system (Soil-health). The importance index and structural equation modeling were used to identify key factors and explore the underlying relationships among them. Results showed that Market-driven and Diversified rotations outperformed the Control by 2%–6% in PBY, while Soil-health and High-risk yielded 23%–26% lower than the Control. Relative to the Control, all rotations showed an increase trend in PBY over time, with Diversified rotations increasing 13%–28% faster than Market-driven and Intensified rotations. Precipitation and nitrogen (N) management are the primary factors affecting cropping system productivity, explaining 25% and 21% yield variations, respectively. Structural equation modeling analysis revealed that precipitation had a significant indirect effect on yield through affecting biological N fixation of pulse crops, in addition to a significant direct effect. Increasing pulse frequency and rotation complexity mitigated PBY loss by 10%–24% during low rainfall seasons. We recommend integrating pulse crops into cropping systems to enhance N management and mitigate yield loss in low precipitation regions.

Guoqi Wen, Kui Liu, Hiroshi Kubota, Gary Peng, Greg Semach, Prabhath Lokuruge, Henry Wai Chau, and Mohammad Khakbazan "Precipitation and nitrogen management are key drivers of cropping system productivity in the Canadian prairies," Canadian Journal of Plant Science 105(1), 1-12, (27 January 2025). https://doi.org/10.1139/cjps-2024-0114
Received: 27 June 2024; Accepted: 1 October 2024; Published: 27 January 2025
JOURNAL ARTICLE
12 PAGES

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KEYWORDS
agricultural production
crop rotation
drought stress
resource utilization
Structural equation modeling
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