Extended heat wave settles on Treasure Valley
MERIDIAN, Idaho — Farmers in the Treasure Valley of Idaho and Oregon are bracing for an extended heat wave.
High temperatures in the area are forecast to be near or above 100 degrees for at least the next two weeks.
“It’s going to be a tough job the next couple of weeks,” said Meridian, Idaho, farmer Richard Durrant.
Beginning July 4, the high temperature in Homedale, Idaho, is forecast to reach at least 100 degrees on 16 of 17 days through July 20, and it’s expected to hit 99 the other day.
In Parma, Idaho, and Ontario, Ore., the high is expected to reach 100 degrees 15 of 17 days during that same span, with the other two days hitting 99 and 98.
“Having 100-degree weather here is not unusual,” said Stuart Reitz, an Oregon State University Extension cropping systems agent in Ontario. “But having it linger for a couple of weeks is.”
Most crops in the region are behind schedule because of heavy snow cover that lasted longer than normal, followed by a constant string of spring rainstorms, and could use some warm weather to catch up, Reitz said.
But many crops produced in the region stop growing when temperatures reach the high 90s, he said.
“That just puts them that much further behind,” Reitz said. “It just makes things that much more complicated.”
The biggest danger for farmers during a hot spell like this one is reduced yields and timely irrigation will be important to mitigate yield loss, said Joel Felix, an OSU weed scientist and crop production specialist in Ontario.
“The main concern is losing yield through moisture stress,” he said. “If you don’t irrigate when the crop needs it, you will lose the yield.”
Ontario farmer Bruce Corn said maintaining a proper irrigation schedule will be critical during the heat wave and that also means not over-watering “because over-watering will cause stress, too.”
“You just have to watch your water real close,” he said. “You have to be out in your fields every day to see what the moisture levels are. Twelve hours can make a big difference in this kind of heat. It’s just a matter of watching things.”
Growers need to be aware of what’s happening in each of their fields “and water according to their crop’s need and not just keep water going because it’s so hot,” Reitz said. “You just need to pay attention to what each individual crop and field’s needs are.”
Durrant said he’s particularly worried about the impact the lingering heat will have on wheat quality because the high temperatures come as much of his wheat is starting to fill.
The heat could have an impact on some of the region’s seed crops because a lot of them are in bloom or starting bloom and the heat could affect pollinators, said Fruitland, Idaho, farmer Jon Fabricius.
“Sometimes pollinators don’t work best when it’s that hot,” he said.