Researchers focus on diversity, flexibility for dryland wheat farmers
A team of Inland Northwest researchers is testing new cropping strategies to help dryland wheat farmers adapt to changing climate conditions.
The four-year project — Inland Pacific Northwest Wheat-based Systems: Landscapes in Transition — is funded with $3.4 million from USDA National Institute of Food and Agriculture.
It will build on research findings from the previous Regional Approaches to Climate Change project, a seven-year collaborative project involving the University of Idaho, Washington State University, Oregon State University and USDA Agricultural Research Service.
The earlier research identified a trend toward increased summer fallow in wheat cropping systems in the Columbia Plateau, and even more is expected with changing climate conditions, said Jodi Johnson-Maynard, a University of Idaho soil scientist and team leader for the new research.
The team will look for ways to diversify cropping systems to be more resilient to change in the future, she said.
Those changing conditions have researchers expecting more variability in weather patterns, with warmer, drier summers and perhaps wetter springs, she said.
The research focuses on the challenges to fall moisture in rain-fed cropping systems. Residual moisture in the seed zone is needed to germinate fall-planted seeds, but farmers can’t always count on adequate fall rain. The majority of those fall-seeded winter crops is wheat, and researchers will be looking for new options to give growers diversity, she said.
“We’re trying to deal with seasonality of our moisture and harsh conditions in the fall. Anything we can do with our cropping system to try to deal with those variables would be helpful,” she said.
One thing the team will be looking at is new winter pea varieties that maximize yield. Peas can be planted a little deeper than wheat and might be a better choice in a dry fall without adequate seed zone moisture to germinate wheat, she said.
Researchers will also look at cover cropping, which has attracted interest from growers. The challenge is the relatively short season before winter hits and before spring crops have to be planted, which doesn’t allow for enough biomass to protect against winter erosion or benefit soils.
The team will be looking at cover crop mixes to maximize biomass going into winter and provide good forage quality for cattle in the spring. Instead of killing the cover crop to plant a spring crop, the crop will be grazed – allowing farmers to make money off the weight gain in cattle rather than planting a spring crop.
“The biomatter on the ground and the roots below the ground would improve soil structure and infiltration rates and add nutrients to the soil. Then they could put in another fall crop after that,” she said.
The research is looking at how alternative crops fit into the rotation and how they can improve productivity, she said.
“Certainly, winter wheat will always be a major part of the cropping system in our region. We’re looking at ways we may be able to increase diversity and give farmers flexibility,” she said.
The goal is to keep farmers successful “despite the fact they’re being thrown curve balls with the weather conditions,” she said.
