Contribution of Planting Date Trends to Increased Maize Yields in the Central United States

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Responses of Maize Hybrids to Twin-Row Spatial Arrangement at Multiple Plant Densities (2012, background): “Maize grain yields in the United States have also increased due to earlier planting dates (Kucharik, 2008) and more extensive use of irrigation (Cassman, 1999).”
Impacts of recent climate change on Wisconsin corn and soybean yield trends (2008, background): “Wisconsin corn planting dates have shifted to approximately 10 days earlier since the late 1970s [9], and Kucharik [ 8 ] suggested that earlier planting across Wisconsin during the 1979‐2005 timeframe has contributed 22% to corn yield trends.”
Screening Corn Hybrids for Cold Tolerance using Morphological Traits for Early-Season Seeding (2015, background): “Over the last few decades, corn yield has improved gradually worldwide due to a combination of continued progresses in agronomic practices and developing stress-tolerant hybrids (Kucharik, 2008).”
Planting Date, Hybrid Maturity, and Weather Effects on Maize Yield and Crop Stage (2019, background): “In cropping areas, such as the US Corn Belt, very early PD are expected to have a yield penalty as a result of cool, wet soil conditions (Kucharik, 2008).”