What is the reason why wheat seedlings turn yellow?

Planting wheat is still very common in China, and wheat can also be said to be a kind of food crop second only to rice in China. The planting area in our country is also very large. However, many people often have a lot of problems because of their immature planting technology. Yellowing of wheat seedlings is one of them, and yellowing of wheat seedlings will have a great impact on its yield. So what is the reason for the yellowing of wheat seedlings? The following editor will give you a brief introduction, let's have a look!

1. Sowing too deep

Sowing too deep is one of the main reasons for the yellowing of wheat seedlings. Generally occurs in dry sloping land, sandy land, when sowing wheat, its sowing depth should be maintained at about 4 cm. If the seeds are sown too deep, it will lead to a lack of nutrients in the lower part of the plant. Wheat seedlings will also be thin due to lack of nutrition, the number of tillers will be significantly reduced, serious will also appear non-tillering phenomenon, resulting in the phenomenon of single seedling. Then before the new tillering node begins to pump out the secondary roots, the lower roots are lack of oxygen and it is difficult to absorb nutrients, and the wheat seedlings will be yellowed due to de-fertilization.

2. Sowing is too shallow

In addition to sowing too deep, too shallow sowing will also lead to the yellowing of wheat seedlings. If the sowing is too shallow, then the wheat seeds are prone to floating seeds, and the mature seedlings are also easy to turn yellow. This phenomenon often occurs in paddy fields and wheat fields with poor soil preparation quality. When sowing, if the sowing is too shallow, the tiller node is easy to be in the dry soil layer in the event of drought. As a result, the number of secondary roots is reduced, and if the tiller node is too high or exposed, it is also very vulnerable to freezing injury, resulting in the yellowing of the leaf tip of wheat seedlings.

3. Toxic gases

If too much toxic gas is produced in the wheat field, it is also very easy to lead to the yellowing of wheat seedlings. This situation mainly occurs in wheat fields where straw is returned to the field, farm manure is not mature and there are too many weeds. If the quality of land preparation is too poor and the ploughing is uneven, it is very easy to cause the wheat root to be elevated. This leads to poor growth of wheat seedlings, and if farm manure is not fully mature, it is easy to release toxic gas in the process of fermentation, causing damage to its young roots, resulting in the yellowing of wheat seedlings.

4. Other reasons

Waterlogging is also very easy to cause wheat seedlings to turn yellow, which mainly occurs in paddy fields and low-lying fields. When wheat is growing, the suitable soil water content should be about 65%. If the moisture is too high, it is easy to lead to hypoxia in the roots, and the late absorption of nutrients will lead to the denudation and yellowing of wheat seedlings. In addition, the excessive planting density is also one of the main reasons. If the sowing is too dense, then the nutritive area of wheat per plant is too small, which is easy to cause the lack of tillers, thus the phenomenon of empty node appears, and the wheat seedlings are easy to grow.

The above is a brief introduction to the cause of wheat seedling yellowing. That's all for today's introduction. This article is for reference only. I hope it can be helpful to everyone.