Optimizing Corn-Soybean Rotation: Reduced Tillage, Varied Irrigation, and Cover Crops

Vasudha Sharma

Climate change severely affects global food security by disrupting water access for crops. Rising temperatures and shifting precipitation patterns cause frequent, severe droughts in some areas and increased rainfall and flooding in others. In recent years, Minnesota has faced erratic rainfall, posing substantial challenges for local farmers. Excessive rainfall submerges crops in certain years, while prolonged droughts leave fields parched, complicating agricultural operations.

These unpredictable conditions pose difficulties for farmers trying to optimize yields and maintain a stable income. Additionally, in irrigated agriculture, regulatory agencies scrutinize farmers for exceeding permit limits on water use during droughts and for reducing nitrate leaching in wet years. To address these challenges, conservation practices like reduced or no tillage and cover cropping could help mitigate the impacts of climate change; however, their effectiveness in irrigated sandy soils is yet to be researched.

We’ll conduct trials on coarse-textured soils under corn-soybean rotation at the Sand Plain research farm. We will test two tillage, two cover crops, and three water level treatments simulating climate change scenarios. We will gather data on soil moisture, nitrate leaching, soil and plant nitrogen, soil physical properties, and biomass.

We anticipate that the results will empower corn farmers to make more informed decisions, adapt to changing water availability patterns, and foster sustainable and resilient agricultural systems in the face of climate change.