What causes yellowing wheat seedlings? Let me teach you the remedies

It is now the season for sowing wheat and seedlings emerging, but at this time a slight misstep can lead to yellowing or death of wheat seedlings. However, after yellowing occurs, farmers should not panic; first they must understand the cause of the yellowing. Let us look together with the editor at the causes of yellowing wheat seedlings and the remedies.

1. Yellowing from nutrient deficiency

If nutrients are lacking during the wheat seedling stage, yellowing will occur. The most common are nitrogen deficiency, phosphorus deficiency and potassium deficiency. Among them, nitrogen deficiency will cause seedlings to show stunted, thin and weak plants, few and weak tillers, and loss of green and yellowing of wheat seedling leaves. In severe cases, chlorophyll decreases or disappears, causing withered leaf tips and yellowing and shedding of the lower old leaves. Phosphorus deficiency will cause a reduction in secondary roots of seedlings, few tillers, dark green leaf color, and yellow leaf tips. If not remedied in time, it will lead to fewer and smaller spikes and shriveled grains. Potassium deficiency generally starts from the tips of old leaves, then extends downward along the leaf veins, and in the later stage the seedlings will lodge and lie flat on the ground.

Remedy: Before planting, sufficient base fertilizer must be applied to ensure what is needed for seedling growth and development. When nutrients are deficient, apply fertilizer promptly in a targeted way so that the seedlings recover as quickly as possible.

2. Sowing too deep

During sowing, unreasonable mechanical adjustment can cause sowing too deep, resulting in excessive growth of the underground stem. When wheat seedlings emerge, they consume a large amount of the seed's nutrients, which leads to slender leaves and poor root development after emergence, causing the seedlings to grow thin and weak and turn yellow.

Remedy: The soil above the seeds can be scraped away to make the covering soil thinner, then combined with intertillage to improve soil permeability, promote the sprouting of lateral roots, and make the wheat seedlings grow stronger.

3. Overdense growth and drought

In wheat fields sown too early and with a large seeding rate, wheat seedlings often grow too densely, resulting in poor permeability, weak development and yellowing. In addition, when the field is too dry, seedlings have few secondary roots, tillering is difficult, and the leaves turn yellow and gradually dry up due to lack of water.

Remedy: For overly dense wheat seedlings, appropriately thin them manually to increase light penetration and ventilation in the wheat field, slow the growth rate, and at the same time deep plow to cut roots, reduce water and fertilizer uptake, and control increased tillering and excessive growth. For dry land, water in time to promote normal growth of the wheat seedlings.

4. Herbicide damage and fertilizer damage

A common problem during the wheat seedling stage is root rot, which can cause wheat seedlings to turn yellow and, in severe cases, can cause the wheat seedlings to wither and die and the roots to rot. When fertilizing wheat seedlings, if decomposed organic fertilizer is not used, or if the seedlings and seeds directly contact the fertilizer and are burned, the leaves or leaf tips will turn yellow.

Remedy: For root rot, 70% thiophanate-methyl wettable powder at 800-1000 times dilution can be used to drench the roots along the rows for control. When fertilizer damage occurs, water in time to dilute it and relieve the fertilizer damage.

  The above is an introduction to the causes of yellowing wheat seedlings and the remedies. I hope it can help you. If you want to learn more related knowledge, please follow us.