Why do wheat seedlings turn yellow? Why?

It is now the season of wheat sowing and emergence, but it is a little inappropriate to gather at this time.

There is a phenomenon of wheat seedling yellowing or seedling death, but after the phenomenon of seedling yellowing, farmers should not be in a hurry, and first of all, they should understand the cause of their seedling yellowing. Let's take a look at the causes and remedies of wheat sprouts.

1. Lack of nutrients and seedling yellow.

If wheat is lacking in nutrients at the seedling stage, it will turn yellow, and the most common is nitrogen, phosphorus and potassium deficiency.

Among them, nitrogen deficiency will show that the seedlings will show that the plants are short and weak, and the tillers are tillers.

Less and weaker, wheat seedling leaves lose green and yellow, and chlorophyll in severe cases.

Decrease or disappear, resulting in wilting of the leaf tip and yellowing of the old leaves in the lower part of the leaf. The phosphorus deficiency will cause the seedlings to reduce the secondary roots, less tillers, dark green leaf color, yellow leaf tips, and if not remediated in time, it will lead to fewer small ears and less full grains. Potassium deficiency generally starts at the tip of the old leaf and then extends down the vein, and the seedlings will lodging to the ground in the later stage.

Remedy: Before planting, we must apply foot fertilizer to ensure the growth and development of seedlings, and timely fertilization should be applied in a timely manner when there is a shortage of nutrients, so that the seedlings can recover as soon as possible.

2. Sowing too deeply.

At the time of sowing, because of the unreasonable mechanical modulation, the sowing is too deep, resulting in the growth of underground stems is too long, and the wheat seedlings are consuming more nutrients of the seeds in the unearthed, which will lead to the phenomenon of slender leaves and stunted root development after the seedlings are unearthed, resulting in the growth of the seedlings thin and yellow.

Remedy: You can remove part of the soil on the seeds, make the cover soil thinner, and then gather the cultivator to improve the permeability of the soil, promote the germination of the lateral roots of the seedlings, and make the wheat seedlings stronger.

3. Excessive growth and drought.

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

Remedy: For the wheat seedlings that grow too densely, the seedlings should be appropriately thinned to increase the light transmittance and ventilation of the wheat field, slow down the growth rate, and at the same time deepen the root breaking, reduce the absorption of water and fertilizer, and control the increase of tillering and excessive growth. For arid land, it is necessary to water in time to promote the normal growth of wheat seedlings.

4. Pesticide damage and fertilizer damage.

Root rot is common at the seedling stage of wheat seedlings, which will cause wheat seedlings to turn yellow, and in severe cases, wheat seedlings can die and roots rot. However, wheat seedlings are not fertilized without using well-rotted organic fertilizer, or the seedlings and seeds are burned in direct contact with the fertilizer, resulting in yellowing of the leaves or leaf tips.

Remedy: For root rot can be used 70% methyl tobuzin.

800 1000 times of wettable powder liquid along the ridge irrigation root control, timely watering and dilution when fertilizer damage occurs, to alleviate fertilizer damage.

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The reasons include improper sowing, pesticide damage, pest damage and lack of elements. Improper sowing will easily cause the wheat population to be too large, which will affect the photosynthesis of wheat, and the amount of pesticides will also affect the yellowing of wheat seedlings, and there are more pests in dead small-leaf wheat seedlings.

The reason for the yellowing of wheat seedlings may be because the land is relatively dry, the sowing is too deep, the land lacks oxygen when the straw is returned to the field, the fertilizer is not applied in time, and there are many pests in the ground, as well as the harm of some root rot will cause the wheat seedlings to turn yellow, which needs to be treated in time.

It may be that the land is very dry, the wheat is short of water, it may be the lack of some nitrogen fertilizer or potassium fertilizer, or it may be that the planting density is relatively large, these conditions will cause the seedlings to turn yellow, and they should be carefully investigated.

Yellowing of wheat seedlings may be the cause of improper sowing, excessive fertilization, pest and disease damage, and pesticide damage

At this time, the wheat seedlings that grow too densely should be removed, and they should be watered with water, diluted fertilizer, and if the pests and diseases are more serious, the branches and leaves should be sprayed with diluted dimethoate and chlorothalonil to restore the health of the wheat. Rainy weather, high soil moisture, low temperature, lack of light and other climatic reasons will affect the growth of wheat, resulting in yellow leaves. If the amount of herbicide sprayed by farmers is too large, it may lead to pesticide damage, resulting in yellowing of wheat seedlings and dry leaf tips. If the inhibitor is used improperly, it will also cause drug damage.

The reasons for the yellowing of wheat seedlings are as follows:

1. The quality of land preparation is poor, the sowing is too deep, and the straw is not completely crushed, resulting in the hanging roots of wheat seedlings, and the relative lack of water and nutrients causes the seedlings to be yellow.

2. Yellowing caused by dense wheat seedlings. The wheat seedlings are too dense, and the phenomena of competing for fertilizer, light, and water occur among the wheat seedlings, showing that the individual is thin and yellow. For this kind of yellow weak seedlings, it can suppress the injured tillers and promote the growth of the tillers. In addition, it is necessary to plough the broken roots to promote the increase of tillering.

3. The wheat seedlings are yellowed due to too deep sowing, and the root system of the wheat seedlings is stunted due to too deep sowing, and the wheat seedlings are thin and weak.

4. Seedling yellow caused by improper fertilization or defertilization. The bottom fertilizer is not fully rotted, the seed fertilizer is used too much, and the seedlings and seeds are easy to be burned, resulting in the yellowing of the leaves or leaf tips. For this kind of yellow weak seedlings, it can be diluted by watering, watering once a day for 3-4 days.

5. Seedling yellowing caused by too little nitrogen fertilizer application in straw returning plots, nitrogen deficiency at seedling stage, dwarf plants, less tillers, wilting at leaf tips, and yellowing and falling off of the lower old leaves.

6. Yellowing caused by pests and diseases. Due to underground pests (grubs, mole crickets, needleworms, etc.), root rot, sheath blight and other hazards, resulting in the yellowing of wheat seedlings, such yellow weak seedlings, to take timely pesticide control measures.

7. Yellowing caused by soil drought. It is manifested as slow tillering speed, short heart leaves, green leaf color, gradual yellowing of middle and lower leaves, small and thin roots, "a single seedling and a needle". For this kind of yellow weak seedlings, they should be watered in time to resist drought.

At this time, the wheat seedlings should be removed from the wheat seedlings that grow too densely, and water them with water, dilute the fertilizer, and if the pests and diseases are more serious, they should also be sprayed with diluted dimethoate and chlorothalonil to the branches and leaves, so that the wheat can recover its health. What is the reason for the yellowing of wheat seedlings due to improper sowing, which may be improper sowing, resulting in wheat seedlings competing for nutrients with each other, at this time, the wheat seedlings should be removed from the weak growth and over-dense growth, and the wheat should be supplemented with compound fertilizer rich in hydrogen, phosphorus and potassium, so that the seedlings can absorb balanced nutrients and resume growth. 2. Excessive fertilization of wheat seedlings yellowing may be due to excessive fertilization or the use of raw fertilizer, resulting in the root burns of seedlings and inability to grow normally.

3. Diseases and insects infringe on wheat seedlings and suffer from root rot, and there will also be yellowing, you should buy methyl tobuzin wettable powder from the store, and dilute it according to the instructions, and water it at the roots of the yellowing seedlings, so as to eliminate the disease, if the disease is serious, you can use special appliances to irrigate the wheat seedlings. 4. Suffer from pesticide damage before sowing wheat, use a higher concentration of pesticide to the seed dressing, which will lead to pesticide damage to the sperm, so that the seedlings will be yellow, if the yellowing symptoms are slight, you can wait for the wheat to recover on its own, if the yellowing is serious, you should water the soil and loosen the soil, and discharge the excess fertilizer. If my answer is helpful to you, please give a thumbs up (in the lower left corner), I look forward to your like, your efforts are very important to me, and your support is also the motivation for my progress.

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The reasons for the yellowing of wheat after emergence are: variety problems, land preparation problems, underground pests, fertilizer damages, and diseases.

1. Breed problem

There are two points of yellowing caused by wheat varieties, one is that the purchased seeds are not suitable for local planting conditions, such as climate, temperature, etc.

The second scenario is to buy fake seeds.

2. Land preparation

Before sowing wheat, the land preparation is not done well, such as the plot where the straw is returned to the field, the ploughing and rotation are uneven, and the suppression after sowing is not solid, resulting in the wheat seeds being sown on the straw, the root system is not well rooted, and the nutrition cannot keep up, resulting in yellowing.

3. Underground pests

After the wheat seeds are sown, underground pests such as: needleworms, ground tigers, grubs, mole crickets, etc., gnaw and destroy the seeds, resulting in either no seedlings, or weak and yellow seedlings after emergence, the main reason is that there is no seed dressing when sowing.

The yellowing caused by this situation can be treated with root irrigation if the harm is light, and the seeds should be destroyed and reseeded in time if the damage is serious.

4. Fertilizer

There are also two cases of wheat yellowing caused by chemical fertilizers, one is that too much chemical fertilizer is used and the wheat seedlings are burned; The second is the use of inferior chemical fertilizers, such as fertilizers with excessive diuret content.

5. Diseases

Wheat root rot will also cause yellowing, this is a good judgment, pull out the yellowed wheat plant, to see whether its roots are rotten, one of the symptoms of general root rot is rot, if so, it is mainly caused by no seed dressing.

Wheat seedling yellowing may be improper sowing, excessive fertilization, pest and disease damage, the cause of pesticide damage, at this time to grow too dense wheat seedlings to remove, and water for it, dilute fertilizer, if the pests and diseases are more serious, but also to spray diluted dimethoate, chlorothalonil agent, so that wheat to restore health.

1. Improper sowing

Wheat seedlings yellowing, may be improper sowing, resulting in wheat seedlings competing for nutrients, at this time to the wheat seedlings in the growth of weak, over-dense seedlings to remove, and for wheat to supplement rich in nitrogen, phosphorus and potassium elements of compound fertilizer, so that the seedlings absorb balanced nutrients, resume growth.

2. Excessive fertilization

Wheat seedling yellowing may be due to excessive fertilization or the use of raw fertilizer, resulting in seedling root burns, can not grow normally, at this time to water water in the soil, dilute the fertilizer in the soil, and for the seedlings with serious yellowing, to eradicate and replenish the seedlings in time.

3. Pest and disease infestation

Wheat seedlings suffer from root rot, there will also be yellowing phenomenon, should buy methyl tobuzin wettable powder from the store, and according to the instructions after dilution, watered on the roots of the yellowing seedlings, so as to eliminate the disease, if the disease is serious, you can use professional equipment to irrigate the wheat seedlings.

4. Suffering from drug damage

Before sowing wheat, the use of higher concentrations of pesticides to dress them, it will lead to pesticide damage to the plants, so that the seedlings yellow, if the yellowing symptoms are mild, you can wait for the wheat to recover on its own, if the yellowing is severe, you should water the soil and loosen the soil, and the excess fertilizer will be discharged.

Some farmers reacted that the wheat seedlings that emerged had turned yellow, and when they saw that the wheat seedlings in their fields had turned yellow, the farmers were very worried and did not know why this happened, which not only affected the quality of the wheat, but may even lead to non-production. Let's introduce farmers to the causes of yellowing of wheat seedlings and related control methods.

1. Excessive soil moisture can lead to.

Many areas of Henan have experienced heavy rainfall this year, and the soil is relatively moist. When wheat is sown, the soil moisture is high, there is little oxygen, and the seeds cannot breathe properly. In the process of germination and emergence, it will be affected to a certain extent, some can not emerge, and some will turn yellow after emergence.

There are also two cases here. First, before wheat is sown, the soil moisture is high. The correct thing to do is to wait a few more days before planting, but depending on the weather forecast, there will be rain and a cooling temperature, so sow in the soil with high humidity in advance.

Secondly, after the wheat is sown, it encounters rainy weather and lasts for a long time, and the wheat will also turn yellow after emergence.

Second, the problem of sowing seeds and fertilizers together.

In recent years, the popularity of seeds and fertilizers sown together has become more and more widespread, and it is more and more recognized by farmers for saving labor at one time. With the correct operation of seed and fertilizer sowing, there are no problems with the emergence and growth of wheat. However, there are exceptions.

For example, in the process of sowing seeds and fertilizers together, due to machine problems or lack of mechanical experience, the distance between seeds and fertilizers is too small (less than 3 cm), and even some fertilizers directly cover the seeds, resulting in the phenomenon of "seedling burning". In this case, it will cause the wheat to turn yellow after emergence. In severe cases, wheat seedlings cannot emerge, and many broken ridges occur due to lack of seedlings.

3. Cooling. When sowing wheat, the temperature is still suitable, basically in the range of 10 to 20 degrees, which is conducive to wheat germination and emergence. However, when the temperature suddenly drops to about 5 degrees, not only will the wheat not be able to emerge, but even if it does, it will easily turn yellow and form weak seedlings. Take Henan Henan as an example.

On October 15, the temperature was still 14-25 degrees, and by October 17 it had dropped to 5-14 degrees, dropping by more than 10 degrees in one day. In case of such severe cooling weather, and the low temperature weather lasts for a long time, the probability of wheat emergence and yellowing will increase.

Fourth, the hazards of herbicides.

The herbicide damage mentioned here refers to the drug damage of closed herbicides, not the drug damage of herbicides after emergence. After all, wheat has just been planted, and post-emergence herbicides have no effect, and farmers will not do so. From the actual planting process, the spraying of closed herbicides on wheat is rare, but it also exists.

A small number of farmers choose to spray a sealing herbicide after wheat planting to reduce the growth of weeds in the field. However, in the process of spraying closed herbicides, due to the lack of rigorous spraying methods or excessive spraying doses, it will also lead to the yellowing of wheat after emergence, and in severe cases, it will also lead to wheat seedling failure.