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12 April 2024 Cropping system typologies perform differently under climate stress in Manitoba, Canada: multi-criteria assessment
S.K. Curtis, M.H. Entz, K.A. Stanley, D.J. Cattani, K.D. Schneider
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Abstract

Information is required to understand how novel biodiversity strategies can improve cropping system resilience to climate change. A “business as usual” (BAU) rotation (wheat–canola–wheat–soybean) was compared with a “warm-season crop” (WS) rotation (corn–sunflower–dry bean–canola); a “biodiverse” (BD) rotation (fall rye with cover crop– corn/soybean intercrop—pea/canola intercrop–green fallow mixture); a “perennial grain” (Kernza) rotation (Kernza grain intermediate wheatgrass); and an organic (ORG) rotation (millet-green fallow mixture-wheat). Drought conditions prevailed in both study years. The BAU rotation had the lowest average yield (1821 kg ha−1 compared with 2533 and 3083 kg ha−1 for the BD and WS rotations, respectively), less post-harvest residual biomass, and a lower net return than the WS rotation. The WS rotation was limited by herbicide-resistant weeds in dry beans. Kernza seed yield was five times lower than for spring wheat. ORG wheat yielded the same as other wheat and had a higher net return. Live roots days, a measure of soil health potential, were 95 for the BAU rotation and 174 and 113 for the BD and WS rotations, respectively; the most were recorded for Kernza (365). Seasonal crop growth duration was increased by including Kernza and fall rye for early season growth, and corn, sunflower, a corn–soybean intercrop, a cover crop, and fall-seeded rye for late season growth. WS and BD rotations outperformed the BAU rotation and the BD system accomplished this with half the N fertilizer. Results demonstrate the potential of biodiverse rotations; barriers to their adoption should be addressed.

S.K. Curtis, M.H. Entz, K.A. Stanley, D.J. Cattani, and K.D. Schneider "Cropping system typologies perform differently under climate stress in Manitoba, Canada: multi-criteria assessment," Canadian Journal of Plant Science 104(5), 441-459, (12 April 2024). https://doi.org/10.1139/cjps-2023-0177
Received: 24 November 2023; Accepted: 6 April 2024; Published: 12 April 2024
JOURNAL ARTICLE
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KEYWORDS
cover crops
fall cereals
intercropping
Kernza intermediate wheatgrass
organic cropping
regenerative agriculture
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