Effect of warming temperatures on US wheat yields

Area of Science:

• Agricultural Science
• Climate Science
• Agronomy

Background:

• Climate change is projected to increase global temperatures, posing a significant threat to agricultural productivity, particularly for staple crops like wheat.
• Understanding the intricate relationship between weather variables and wheat yield is crucial for developing climate-resilient agricultural practices.

Purpose of the Study:

• To analyze the impact of weather variables, specifically temperature, on wheat yields using a comprehensive dataset.
• To investigate how different temperature exposures throughout the growing season affect wheat production and identify key drivers of yield loss.

Main Methods:

• Utilized a unique dataset combining Kansas wheat variety field trial results (1985-2013) with location-specific weather data.
• Employed regression analysis to quantify the relationship between weather variables and wheat yield, focusing on temperature exposure.

Main Results:

• Identified freezing temperatures in Fall and extreme heat in Spring as primary drivers of wheat yield loss.
• Found that overall warming trends negatively affect wheat yields, despite potential benefits from reduced freezing exposure.
• Observed a trade-off between average yield and heat resistance in wheat varieties, with newer varieties exhibiting lower heat tolerance.
• Noted that increased Spring rainfall could partially mitigate the negative impacts of warming.

Conclusions:

• The method of measuring temperature exposure significantly influences model predictions and forecasted warming impacts on wheat yields.
• Wheat breeding strategies must consider the trade-off between yield potential and heat resilience to adapt to a changing climate.
• Future agricultural research should focus on developing wheat varieties with enhanced tolerance to extreme heat events.