Corn+Soybean Digest Logo

Heavy rains can cause problems with heavily saturated soil for corn plants. Find out what can happen.

July 25, 2019

3 Min Read
7.25 damaged corn.jpg

Strong winds associated with rain storms much of the Midwest has recently experienced caused localized root lodging and “green snap”. The magnitude of this damage is influenced by several factors including crop stage of development and hybrid genetics.

Root lodging occurs when strong winds pull corn roots part way out of the soil. The problem is more pronounced when soil are saturated by heavy rains accompanying winds. If root lodging occurs before grain fill, plants usually recover at least partly by "kneeing up." This response results in the characteristic gooseneck bend in the lower stalk with brace roots providing above ground support. If this stalk bending takes place before pollination, there may be little effect on yield. When lodging occurs later in the season, some yield decrease due to partial loss of root activity and reduced light interception may occur. If root lodging occurs shortly before or during pollen shed and pollination, it may interfere with effective fertilization thereby reducing kernel set.

Green snap or "brittle snap" are terms used to characterize pre-tassel stalk brakeage caused by wind. Corn plants are more prone to green snap during the rapid elongation stage of growth between V8 and tasseling, especially during the two-week period prior to tasseling (variable corn development this year may have limited green snap damage from wind storms last week).  Breaks in the stalk usually occur at nodes (along nodal plates) below the ear. When soil moisture and temperature conditions are favorable for growth during this stage of plant development, plants elongate rapidly but stalks are unusually brittle. Stalk brittleness is greatest in rapidly growing corn under high temperature, high soil moisture conditions. There is speculation that rapidly growing plants are more susceptible to snapping-off for several days during the few weeks before tasseling because there has been little time for plants to develop lignified tissues at the nodes.

Althoughgreen snap problems  are experienced periodically in the Midwest, it's usually a more serious problem in the western Corn Belt. Vulnerability to green snap damage varies among hybrids. However, all hybrids are at risk from such wind injury when they are growing rapidly prior to tasseling. Once the crop tassels green snap problems generally disappear. Back in the 1990’s, Nebraska researchers observed that it was often the most productive fields with the highest yield potential that experienced the greatest green snap injury. They concluded that factors promoting rapid growth early in the growing season also predisposed corn to greater green snap injury.

According to Dr. Emerson Nafziger at the University of Illinois  “Yield effects of green snap depend on the number of plants snapped and where the breakage takes place. Stalks that break above the ear will usually produce an ear, but if nearby plants are intact, they will shade the broken-off plants and reduce ear size. When plants break at the node below the top ear, dormancy will break and allow the next ear down to develop, but it may not receive enough pollen to produce a lot of kernels. Plants that break near the ground won't produce yield, of course, but will allow more light to reach intact plants, which in turn will produce more grain. Loss of plants thus typically reduces overall yield less than the percentage of broken plants might suggest.”

 

Source: Ohio State University

The source is solely responsible for the information provided and is wholly owned by the source. Informa Business Media and all its subsidiaries are not responsible for any of the content contained in this information asset.

 

Subscribe to receive top agriculture news
Be informed daily with these free e-newsletters

You May Also Like