The 2010 soybean harvest looks promising for many growers, but green soybean plants and stems may reduce harvest speed this fall.
“Green stems, sometimes referred to as ‘green stem syndrome’ or ‘green stem disorder’ occur when stems remain green even though pods and seeds yield and mature fine,” Vince Davis, University of Illinois Extension soybean specialist. “The condition can range from a nearly normal number of pods on a plant with green stems, to entire plants that remain green with few pods and no seeds developed.”
Entire plants that remain green can easily persist until a killing frost occurs, he said. These cases can also range from entirely genetic to entirely environmental causes.
“Genetic causes in nature are due to male sterility, causing plants to set about 85% fewer pods resulting in 4.5 times greater carbohydrate concentrations in the root, stem, and leaf matter,” he said. “In 2006, Curtis Hill and fellow researchers evaluated 1,187 different MGI and MGII cultivars in Illinois from 2001 to 2004 and found some relationships between percentages of green stem to certain cultivars suggesting better variety selection may be possible.”… Continue readingRead More »