Heat Stress in Soybean - August 2010
[Title Slide - Heat Stress in Soybean. Your Arkansas Soybean Podcast, University of Arkansas Division of Agriculture, Arkansas Soybean Promotion Board.]
[Dr. Jeremy Ross, Soybean Agronomist standing in a field giving a presentation at a field day] Typically, soybeans like it around 86 degrees, that’s their optimum temperature for growth and development and we’ve been well above that for the last, at least 10 days. And it looks like for the next several days we’re going be above that. [Pictures of a soybean field and plants showing signs of heat stress.] Any time soybeans get any kind of stress they kind of, start shedding pods, start shedding blooms, to try to eliminate some of that stress. And so, I’ve had several calls the last several, probably last 10 days, on soybeans starting to shed pods, starting to shed blooms.
[Picture of a soybean field with poly-pipe irrigation and fields with water between the soybean rows.] Best thing we can do for that is irrigation. That’s going give us some relief from the heat, even though we’re still, you know, hovering around 100 degrees there’s a possibility you can still see some shed. [Dr. Jeremy Ross] But that irrigation is going to be our best method of combating the heat stress. It’s going to cool that temperature inside that canopy a little bit cooler than it is in the ambient temperature. Because you’ve got some shading in there, you’ve got that evaporation from that irrigation water. So it’s going to be a little bit cooler in there and soybeans aren't going to be as stressed in irrigated conditions as they are under dryland conditions.
[Narrator] Your Arkansas Soybean Podcast is a production of the University of Arkansas Division of Agriculture and was funded in part by the Arkansas Soybean Promotion Board. For more information about soybean farming in Arkansas, contact your local county Extension office.
[Title slide - For more information contact your local county Extension office. Your Arkansas Soybean Podcast, University of Arkansas Division of Agriculture, Arkansas Soybean Promotion Board]