Increasing crop diversity mitigates weather variations and improves yield stability

Area of Science:

• Agricultural Science
• Agronomy
• Crop Science

Background:

• Crop rotation diversification is a key strategy for reducing yield variability and enhancing agricultural resilience to environmental stresses.
• While benefits of diverse rotations and reduced tillage are known, their impact on yield stability under limiting or excess soil moisture is less understood.

Purpose of the Study:

• To quantify the impact of crop rotation diversity and tillage practices on crop yields and their stability.
• To assess the benefits of crop diversity under various soil moisture and temperature conditions.

Main Methods:

• Utilized 31 years of yield and weather data from a long-term rotation and tillage trial.
• Employed parametric and non-parametric approaches to analyze yield probabilities and benefits of rotation diversity (monocrop, 2-crop, 3-crop with cover crops) and tillage (conventional, reduced).

Main Results:

• Yield stability significantly increased for corn and soybean when integrated into more diverse crop rotations.
• Introducing small grains into corn-soybean rotations substantially benefited soybean yields and stability.
• In hot, dry years, diversified rotations with reduced tillage increased corn and soybean yields by 7% and 22%, respectively.

Conclusions:

• Crop diversification strategies improve the probability of favorable growing conditions and decrease crop failure risk.
• Diversification and reduced tillage offer a comprehensive approach to lower yield variability and boost cropping system resilience.
• These practices are crucial for sustaining crop yields in challenging future production environments.