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The 2020 report noted overall crop yields could fall 3% to 7% in the Piedmont and mountain regions if carbon emissions aren’t cut. Coastal areas could see more extreme weather.
Corn futures prices that approached $6.30 a bushel in June have since tumbled to $4.10, after U.S. farmers ultimately produced record crop yields. "I wish I sold a lot more," Henebry said.
The US is the world's largest producer of corn. [8] According to the United States Department of Agriculture (USDA), the average U.S. yield for corn was 177 bushels per acre, up 3.3 percent over 2020 and a record high, with 16 states posting state records in output, and Iowa reporting a record of 205 bushels of corn per acre.
The IPCC Special Report on Climate Change and Land and the Special Report on Global Warming of 1.5 °C both project mixed changes in the yields of crops as global warming happens with some breadbasket regions becoming less productive, while other crops increase ranges and productivity. [24]
Corn grey leaf spot can be an extremely devastating disease as potential yield losses range from 5 to 40 US bushels per acre (440 to 3,480 L/ha). At higher disease levels, even greater losses can result. When a corn plant's ability to store and produce carbohydrates (glucose) in the grain is diminished, yield losses take place.
As a result, farmers harvested 47% of the country's second biggest corn crop in history by Oct. 13, topping the five-year average of 39%, according to U.S. data.
In 1995 the USDA released a report stating that the net energy balance of corn ethanol in the United States was an average of 1.24. It was previously considered to have a negative net energy balance. However, due to increases in corn crop yield and more efficient farming practices corn ethanol had gained energy efficiency. [3]
Another form of cultural control used to limit southern corn leaf blight is crop rotation with non-host crops. Additionally, foliar fungicides may be used. Foliar disease control is critical from 14 days before to 21 days after tasseling, this is the most susceptible time for damages from leaf blight to occur. [ 10 ]