Water Saturated Soil Conditions & Corn
- If not emerged, corn stand is reduced after 48 hours of saturated conditions (anaerobic) and basically non-existent after 96 hours. Extended or repeated ponded areas may need to be replanted.
- If emerged, air and water temp influences effect of being submerged. Temps above 75 degrees, corn can be submerged for a day. Temps between 55 and 75; 2-3 days. Temps below 55; 4 or so days.
- If emerged or not, saturated soils for more than 24 hours can increase the risk of Pythium or possibly other seedling diseases.
- Pythium will be first noticed on mesocotyl (white tissue connecting seed to the above portion of the plant)
- Mesocotyl should remain white until v6.
- Damage to mesocotyl can slow plant growth by limiting the transfer of nutrition from the seed to the developing plant.
- If mesocotyl gets completely damaged, the plant needs to grow a nodal root system without the resources from the seed as normal – a slow process and no top growth will occur.
- Roots require oxygen to grow. Water saturated (anaerobic) conditions can:
- Root growth ceases in as little as 24 hours
- Rooting depth over the season was affected in as little as 48 hours. This could limit plants’ ability to find N late season.
- Substantial root mortality occurred in as little as 3 days
- Anaerobic soil conditions can alter nutrient availability through physical loss and destruction of beneficial micro-organisms
- Plants under stress are more affected by other stresses, so if a farmer chooses to keep those areas, PGRs, foliar nutrition & fungicides are even more critical.
- If a farmer decides to replant – do him a favor and convince him to replant clean and not interplant
- Consider an additional 30-50lbs of N by V6 to areas damaged from water-saturated soil conditions
A pretty good resource from U of NE: https://cropwatch.unl.edu/2019/corn-establishment-and-growth-saturated-soils-brief-review-new-research