Due to the extreme wet weather, many corn fields are lacking nitrogen or have lost nitrogen from side-dressing. Nitrogen can change forms in the soil due to the wet weather and be release back into the atmosphere showing yellowing in plants.
By JIM LANGHAM

Feature Writer


PAULDING – Ohio State University Extension educator Sarah Noggle is spending her time these days assessing crop damage from recent heavy rains. While it is difficult to estimate total impact, Noggle said there is no doubt that ponding and heavy run-off rain has taken a toll on Paulding County fields.

“We got quite a bit more rain last week,” Noggle said. “Flooding issues increased because of ponding pressure in flooding situations. I would say people need to prepare to start to truly assess crop loss damage.

“In corn areas, it’s hard to tell the affect that it’s had or whether the corn is going to survive,” continued Noggle. “In some of the earlier corn, the crops could possibly still be there. In the later planted corn, there are going to be some issues.”

Noggle said that corn can survive up to four days in standing water, providing that weather conditions are cool. The risk potentially increases in warm weather. She has been getting reports of issues of corn with rootworm. She noted variety can determine the damage assessment.

“As we see rootworm populate, they start to kill developing corn roots,” Noggle said. “The only good thing that comes out of rain is that heavy rains tend to drown out small rootworm larvae. Whatever hybrid you use, farmers still need to look at those roots once larvae is complete.”

Noggle said that saturated soil conditions will also provide the optimum conditions for the water molds that are common across the state.

“In these cases, the whole roots are brown, sometimes with dark brown lesions on the roots and the tissues can be brown to tan,” Noggle said. “Both Phytophthora sojae pythium are contributing to this problem.

“Once the soybeans are at the V2 growth state or greater, the protection from the seed treatment is gone and we are relying on the soybean plants’ defense system to mitigate the damage,” added Noggle.

“Obviously the soybeans have been planted later than corn. Many fields have standing water. If you dig up the roots of the plants, they may or may not be brown,” said Noggle. “You can look at the cortical cells on the outside of the plant. You can just take those and pull them off.”

Noggle said that in plants that are under water, oxygen has been deleted and carbon dioxide is building up, which causes the soybean plants to suffocate.

Any wet soil doesn’t get as many nodules, Noggle observed. As wet as things are, we have perfect conditions for water mold.

Concerning wheat, Noggle said that two main issues are the development of head scabs and vomitoxin. If a wheat field has head scab or head blight, it is going to reduce the yield as kernels become infected.