When wheat crops start to turn yellow after irrigation, it is usually due to a few common causes. One of the main reasons this occurs is due to waterlogging in heavy soils.
When heavy clay soils become saturated with water, it can suffocate the wheat roots by depriving them of the necessary oxygen needed for proper growth and development. The roots of the wheat plant become stressed, and the wheat begins to exhibit symptoms of stress, such as yellowing leaves and stunted growth.
To prevent waterlogging and yellowing, it is essential to ensure proper soil drainage. This can be done by adding organic matter to improve the structure of the soil, such as compost or manure, or using crop rotations to help break up compacted soil. Additionally, reducing irrigation frequency or utilizing a drip irrigation system will also assist in preventing waterlogging from occurring.
Another potential cause of yellowing in wheat is due to nutrient deficiencies. If the soil lacks nitrogen, the wheat will struggle to produce chlorophyll, which is responsible for the plant’s green color. Ensuring adequate nutrient levels in the soil and employing a fertilization schedule will help prevent these issues from occurring.
Wheat may also turn yellow if it is under moisture stress. In scenarios where there is not enough water to penetrate deep enough into the soil profile, the wheat may suffer from drought stress, leading to yellowing and potential stunted growth. In such instances, increasing the frequency and amount of irrigation can help to combat this issue.
In summary, the yellowing of wheat in heavy soil after irrigation can indicate several different issues. It could be a lack of proper drainage that leads to waterlogging, a nutrient deficiency, or moisture stress. It is essential to identify the root cause of the problem and take the necessary steps to address it to ensure a healthy wheat crop.