One Earth, Volume 2, 20 March 2020,
A grand challenge facing humanity is how to produce food for a growing population in the face of a changing climate and environmental degradation. Although empirical evidence remains sparse, management strategies that increase environmental sustainability, such as increasing agroecosystem diversity through crop rotations, may also increase resilience to weather extremes without sacrificing yields. We used multilevel regression analyses of long-term crop yield datasets across a continental precipitation gradient to assess how temporal crop diversification affects maize yields in intensively managed grain systems. More diverse rotations increased maize yields over time and across all growing conditions (28.1% on average), including in favorable conditions (22.6%). Notably, more diverse rotations also showed positive effects on yield under unfavorable conditions, whereby yield losses were reduced by 14.0%–89.9% in drought years. Systems approaches to environmental sustainability and yield resilience, such as crop-rotation diversification, are a central component of risk-reduction strategies and should inform the enablement of policies.
Agricultural Development; Climate Change; Climate Variability; Climate Variation; Crop Diversity; Crop Rotation; Crop Yield; Cropping Practice; Diversified Farming Systems; Drought; Environmental Degradation; Environmental Management; Experimental Study; Growing Season; Long-term Experiment; Maize; Nature-society Relations; North America; Policy Approach; Resilience; Global