USDA reports that 89% of all soybeans and 100% of the corn crop has been harvested in Missouri. County averages can be seen here.
Corn and beans respond differently to drought due to the different pollination periods. Corn has a 10-day period, and temperatures above 100 degrees hit when much of Missouri's corn crop was pollinating and silking. Stress on plants at this stage reduced the number of fertilized flowers, and stress after silking resulted in increased kernel abortion or reduced seed size.
By contrast, soybeans have a 30-day period and a "built-in reserve capacity" that can make internal modifications to stress during pod development. Stress at this time reduces the number of flowers and small pods that remain on the stalk. Stress during seed filling can result in additional pod abscission, arrested development of seeds in retained pods and reduced seed size.
Wiebold said he would caution farmers at the conference against drastic changes in 2013. He also will show updated graphics on yield variability throughout the state. He will urge farmers to diversify their crops and reevaluate their seeding rates based upon soil conditions in their area, rather than across the varied geographical areas of the state. "Understanding where you're farming is important," he said. "What is the water supply where you live? What are the typical weather patterns where you live?"
Wiebold will present information from MU's 19 corn and 20 soybean plots across the state. "We had fields that yielded nothing and others, especially on the Mississippi and Missouri rivers, that did particularly well," he said.
A full schedule of the Crop Management Conference, sponsored by the Division of Plant Sciences, MU College of Food and Natural Resources, is available online.
Source: University of Missouri Extension