What causes the yellowing of wheat leaves in spring, wheat spring

There are two ways to judge whether it is a lack of water or nutrients.

Many leaves of wheat are yellow, which may be caused by these reasons: 1. Yellow leaves caused by meteorological factors such as low temperature, soil drought, strong wind and frost; 2. Lack of soil fertilizer, including nitrogen, phosphorus, potassium, calcium, etc.; 3. Soil compaction, flooding, waterlogging, salinity, toxic substances, etc., affect the growth of the root system and turn yellow; 4. Pests and diseases, underground pests, diseases mainly include sheath blight, total erosion and root rot.

1. Yellow leaves caused by meteorological factors such as low temperature, soil drought, strong wind and frost. The appearance time of this yellow leaf is often closely related to weather changes, and the range is often large, and the performance of the whole field is relatively consistent. This kind of yellow leaf is physiological, generally does not need to be controlled, serious can be applied fast-acting fertilizer to promote growth.

2. Lack of soil fertilizer, including nitrogen, phosphorus, potassium, calcium, etc.; Plants lacking nitrogen nutrients are yellow and thin overall, and grow slowly. It is not difficult to understand that the way to alleviate this yellow leaf is to top dressing and irrigation, and make up for what is missing.

3. Soil compaction, flooding, waterlogging, salinity, toxic substances, etc., all factors that can affect root growth and even cause part of the root system to die can cause yellow leaves. In recent years, there are often the use of pesticides, especially the excessive or improper method of herbicides, and the yellow leaves caused by the crushing of straw returning to the field is not fine, unevenly dispersed, and the overhead root system. The countermeasures are to improve the soil, increase the application of organic fertilizer, advocate intensive cultivation and standardize the technology of drug use.

There are several reasons for the yellowing of wheat, which may be that the wheat sowing time is late, and the wheat field is generally planted more, resulting in the excessive density of some wheat, which directly affects the photosynthesis of wheat, and the nutrients are insufficient, resulting in yellowing of leaves. Or the lower leaves of wheat will also turn yellow when they are frozen, or it may be that the leaves are yellow due to lack of fertilizer and water.

Analysis of the causes of yellowing of wheat leaves.

Lack of fertilizer causes yellowing.

Generally, it is caused by nitrogen deficiency, which is related to the shallow rotary tillage and the lack of timely ploughing, and also related to the amount of fertilizer used, which is mainly manifested as poor growth of wheat, no tillering, and weak seedlings into patches of yellow. There is also yellowing of wheat caused by potassium and phosphorus deficiency.

Frost damage causes yellowing.

Wheat frost damage. Wheat frost damage is related to early sowing, and is also related to the stress resistance of wheat varieties.

The disease causes yellowing.

The main diseases are total erosion, sheath blight, root rot, etc., these diseases show yellowing of leaves, lesions on leaves, these diseases focus on prevention, once they occur, they need to be sprayed in time.

Pest. Wheat red spider.

There are many underground pests in wheat, needleworms, ground tigers, grubs are often seen, and after the wheat seedlings grow, wheat spiders, aphids and other pests are often encountered, which may cause wheat to turn yellow.

Yellowing caused by pesticide damage.

It is mainly the pesticide damage of herbicides, if it is used at a low temperature seedling hour, it is likely to cause pesticide damage, and the use of herbicides such as methyldisulfuron-methyl after jointing will also be harmful.

Soil drought, lack of fertilizer, compaction, flooding, waterlogging, salinity, toxic substances, high winds, low temperatures, frost, pests and diseases. The yellowing of leaves caused by the weather generally does not need to be controlled. What fertilizer is lacking, what fertilizer, improve the soil, and increase the application of organic fertilizer.

Use suitable pesticides to remove pests and diseases.

If the leaves of the wheat are yellow, it means that there is not enough water in the field, or the amount of fertilizer is not enough, and there is also a possibility that the wheat is deficient in potassium.

Reasons: 1. The sowing time of wheat is relatively late, and the number of wheat fields is generally planted, which leads to the excessive density of some wheat, which directly affects the photosynthesis of wheat, and the lack of nutrients leads to the yellowing of leaves.

2. The lower leaves of wheat turn yellow after freezing.

3. Insufficient fertilizer and water cause yellowing of leaves.

4. Drug poisoning, herbicides are the main drugs that cause wheat seedling poisoning.

Prevention and control: 1. Strengthen the management of fertilizer and water according to the situation, if the bottom fertilizer is relatively sufficient, you can water it after the year, the soil in the field is not too dry, and tillage and hoeing should be the main method to promote the growth of wheat seedlings. If the bottom fertilizer is insufficient and there is no watering after the year, the field will be severely drought, and the management of fertilizer and water should be strengthened in time.

2. Fertilizer should be applied before watering, mostly fast-acting fertilizers, such as ammonium bicarbonate and ammonium sulfate, urea is not suitable for application at low temperatures, and appropriate potassium fertilizer can effectively promote the normal growth of wheat seedlings.

3. Before the wheat returns to green and jointing, some regulators can be used to help the wheat take root and strengthen the seedlings and prevent lodging.

4. Pay attention to pest control.

There can be many reasons why wheat leaves turn yellow, and here are a few possible scenarios:

Malnutrition: The yellowing of wheat leaves may be due to the lack of certain essential nutrients such as nitrogen, phosphorus, potassium, etc., which are necessary for the normal growth of plants. If these elements are lacking in the soil, or if the plants are unable to absorb them, it can cause the wheat leaves to turn yellow.

Dehydration: The delicate yellow color of wheat leaves can also be caused by dehydration. If there is not enough water in the soil, the plant will not be able to absorb nutrients properly and will not be able to keep the leaves green.

Disease: Yellowing of wheat leaves can also be caused by disease infection. For example, diseases such as wheat leaf rust and powdery mildew can cause yellowing of leaves.

Environmental Concerns: Yellowing of wheat leaves can also be caused by environmental concerns. For example, the soil is too acidic or alkaline, toxic substances in the soil, etc., can cause the wheat leaves to turn yellow.

To solve the problem of yellowing of wheat leaves, it is necessary to determine the specific cause of jujube bending. Problems can be identified by checking soil conditions, observing plant growth, and conducting disease detection, and taking appropriate measures to solve the problem.

After the wheat emerges from the seedlings, it is necessary to distinguish the cause of hunger, and then the rotten disturbance can be solved by the symptom!

The yellowing of the leaves at the heading stage of wheat may be caused by the lack of nitrogen fertilizer, and it is necessary to apply accelerated nitrogen fertilizer to alleviate the wheat at this time. It can also be caused by excessive sowing density, in which case thinning of wheat that grows too densely. The infestation of aphids, red spiders, and sapuckers will also cause the wheat leaves to turn yellow, so it is necessary to spray the green dimethoate solution**.

Wheat needs sufficient nutrient supply during the growth period, if nitrogen fertilizer is not applied to wheat in time, it will lead to wheat erection and malnutrition and make the leaves yellow, and the remaining rows need to apply accelerated nitrogen fertilizer to wheat at this time to alleviate.

When planting wheat, if the sowing density is too large, it will reduce the light reception rate and permeability inside the plant, thereby affecting the photosynthesis of the leaves, resulting in the yellowing of wheat leaves.

Wheat during the growth period of the dead ear is easy to suffer from sheath blight, root rot, total erosion and other diseases, after the onset of the disease will lead to the root respiration of wheat blocked, so that the leaves appear yellow, at this time it is necessary to pull out the diseased plant in time, and spray the leaf with pesticides, so that the wheat can recover as soon as possible.

Wheat is also susceptible to aphids, red spiders, suckers and other insect pests during the growth period, which will also lead to yellowing of wheat leaves at the heading stage.

The reason for yellowing is too much, because du for your planting plot situation, zhi did not say a bottom fertilizer, nitrogen dao fertilizer less this possibility.

Sex is not big, the seedling stage needs fertilizer not much, unless it is barren and thin, the weather is hot and cold, causing wheat leaves to freeze to death, there is yellowing before freezing to death, which means that you sow early, wheat is a strong seedling rather than a strong seedling, next time you should pay attention to the sowing time, to sow three or four days a week after the cold dew, the earliest is the cold dew sowing three wheat disease, the disease should be sporadic sheath blight should occur next spring, this may be smaller, four wheat roots may have aphid damage, this thing is very hidden in winter, in the root of the wheat, as long as it is watered in winter, it can be killed.

Summary. Pro, the yellowing of wheat may be due to insufficient fertilization, herbicide damage, and frost damage.

What is the reason for the yellowing of wheat, ask for answers.

Pro, the yellowing of wheat may be due to insufficient fertilization, herbicide damage, and frost damage.

If wheat is sown too late and encounters frost damage, or encounters inverted spring cold, yellow leaves may appear in the lower leaves of wheat, and wheat disease and frost resistance will be reduced.

When the wheat bottom fertilizer is insufficient, yellowing will occur, especially after the straw is returned to the field, due to the consumption of nitrogen in the process of rotting, it may lead to the symptoms of fertilizer deficiency. When wheat is deficient in nitrogen, potassium and other elements, it will also show yellowing symptoms.

Pro, wheat seedling pesticide damage is mainly herbicides, herbicide dosage is too large or improper use, may cause pesticide damage, temperature drop will also cause pesticide damage, if the use of wang control agent is improper, it will also cause pesticide damage, if the previous stubble appears when planting corn, the use of atrazine and other herbicides, may cause pesticide damage.

What is this disease.

Dear, this is yellow leaf disease.

The disease of yellowing of wheat leaves is collectively called yellow leaf disease, and there are four main causes of this disease. The first: it is caused by root rot; The second:

Wheat was suddenly damaged by low temperature frost; The third species: wheat has yellow mosaic virus disease; Fourth: the herbicide used for wheat is caused by too much dosage.

There are reasons for the yellowing of wheat, and the specific reasons can be summarized as follows:

1. The sowing density of wheat is too large, which means that the photosynthesis of wheat is insufficient, resulting in insufficient nutrients absorbed by wheat, resulting in yellowing of leaves.

2. The second reason is frost damage caused by the inverted spring cold. When wheat is frozen, the lower leaves will turn yellow, and the disease resistance of wheat will also decrease.

3. The third reason is that the fertilizer and water are insufficient, especially when the nitrogen fertilizer supplied to the wheat is insufficient, the wheat seedlings will appear thin and small, yellowing, and the degree of yellowing is uneven.

4. The fourth reason is the yellowing of wheat leaves caused by herbicides, and the application of herbicides may cause pesticide damage if they are not careful, and there is no way to save the dead wheat seedlings produced by herbicides.

Control measures for yellowing of wheat leaves:

1. Strengthen fertilizer and water management. If the bottom fertilizer is sufficient, it has been watered after the Spring Festival, and the field is not too dry, so it should be mainly cultivated and hoeed to promote the growth of wheat seedlings. If the base fertilizer is insufficient, and there is no watering after the Spring Festival, the drought in the field is serious, and the fertilizer and water management should be strengthened in time.

Sprinkle chemical fertilizer before watering, mainly ammonium carbonate, ammonium sulfate and other fast-acting fertilizers, urea is slow to convert at low temperature, and should not be used. Potassium fertilizer should be increased appropriately to promote the growth of wheat seedlings.

2. Use wheat regulator: Once it is found that there is a phenomenon of wheat leaves that are resistant to yellow and yellow seedlings, immediately use 1 wheat regulator.

3. Control of pests and diseases: wheat aphids, red spiders and other pests should be treated in a timely manner.