What is in this article?:
- Post-flood nutrient management
- How much lost N?
- Suggested approach
- What else can be done?
- Are other nutrients affected by the wet conditions?
- Crop nutrients analysis/management in post-flood conditions.
- Tips on nitrogen offered.
As the floodwater begins to recede, corn and grain sorghum producers may wonder what management practices -- particularly in relation to nitrogen -- are appropriate. The magnitude of the loss of nitrogen will depend on soil type, field topography, fertilizer source, and time of nitrogen application, among others.
The management practices should also consider growth stage of the crop, whether the stand is sufficient to keep, and the crop yield potential if replanting is not needed. Farmers are encouraged to wait a few days before assessing the condition of the existing crop and decide on possible management practices.
The growing point in corn at the V4-V5 growth stage may still be below the soil level, so it is very sensitive to waterlogged conditions. Under normal growing conditions, the growing point is usually light yellow. A dark green growing point may be an indication of terminal damage. If the growing point is above ground, then the chances of survival increase significantly.