The corn has just set a cob, and the leaves under it are yellow, what s the matter?

<> maize disease causes corn seedlings to turn yellow.

It is mainly bacterial wilt that causes the yellowing of the lower leaves.

The lack of water in corn causes corn seedlings to turn yellow.

Drought in the later stage of corn leads to a lack of water and nutrients in the crop, resulting in yellowing of the lower leaves Nitrogen deficiency of corn causes corn seedlings to turn yellow.

In the later stage of maize, the lower leaves first turn yellow, gradually develop to the upper part, and the lower leaves die in severe cases.

However, the yellowing of the leaves is from the tip of the leaf, and it gradually turns yellow in the form of an inverted "V" open.

Potassium deficiency in corn causes corn seedlings to turn yellow.

In the process of yellowing, the leaves start from the tip of the leaf, and then the edges of the leaf turn yellow and dry up, and in severe cases, the whole leaf dies.

Flooding of corn causes corn seedlings to turn yellow.

When corn is flooded for a long time, usually more than 24 hours, the lower leaves will die quickly.

Corn seedlings yellowing dry leaf remedy:

Corn is a zinc-sensitive crop, and zinc deficiency will cause albino seedlings, which look like yellow corn seedlings. Generally, zinc fertilizer is better with base fertilizer; If there is a lack of zinc in the growth period, 1 kg of zinc sulfate per mu can be mixed with 10 15 kg of fine soil at the seedling stage, and it can be applied in strips or holes; Or use zinc sulfate solution to spray twice every 7 days from seedling stage to jointing, and use 60kg of fertilizer per mu.

Corn leaves turn yellow, mainly because the weather temperature is too high and the soil lacks moisture. This situation should be watered and fertilized in a timely manner.

There are many reasons for the yellowing of corn leaves, such as pests and diseases, nitrogen and potassium deficiency, damage, high temperature and rainy weather, etc. It is also possible that it is caused by two reasons for subordinates:

Lack of water and fertilizer causes yellowing of leaves, and water and fertilizer are replenished accordingly;

Verticillium wilt and wilt can also cause yellowing of corn leaves. In most cases, irrigation can quickly reduce fertilizer damage. For fertilizer damage caused by nitrogen excess, an appropriate amount of plant growth regulators such as arthrothramine and paclobutrazol can be sprayed to alleviate it.

If there is a surplus of phosphorus, nitrogen, potassium, zinc and other micro-fertilizers can be added to adjust the reasonable ratio between the elements. In most cases, the fertilizer damage caused by trace elements occurs in spots, and as long as field management is strengthened, it has little impact on the yield per unit area of maize.

Hello, the bottom leaves of corn are yellow and dry leaves, many corn farmers think that corn is lacking in nitrogen, not necessarily nitrogen deficiency, and the yellowing of corn leaves is mainly due to the following reasons:

1. Corn disease causes yellowing of corn seedlings, mainly due to bacterial wilt causing yellowing of lower leaves.

2. The lack of water in corn causes the yellowing of corn seedlings, and the drought in the later stage of corn leads to the lack of water in crops and the lack of nutrition, resulting in yellowing of the lower leaves.

3. Nitrogen deficiency in corn causes corn seedlings to turn yellow, and the lower leaves of corn turn yellow first, and gradually develop to the upper part, and the lower leaves die in severe cases. However, the yellowing of the leaves is from the tip of the leaf, and it gradually turns yellow in the form of an inverted "V" open.

4. Corn potassium deficiency causes corn seedlings to turn yellow, and the leaves start from the tip of the leaf in the process of yellowing, and then the edge of the leaf turns yellow and dry, and the whole leaf dies in severe cases.

5. Corn flooding causes corn seedlings to turn yellow, and the corn is flooded for a long time, generally more than 24 hours, and the lower leaves will die quickly.

Nitrogen fertilizer needs to be supplemented, but if there is a lack of phosphorus fertilizer, nitrogen fertilizer cannot be supplemented, so in this case, it is necessary to apply commonly used phosphate fertilizer, nitrogen fertilizer or Bika water-soluble fertilizer to corn.

The details are as follows:1When buying seeds, do not buy miscellaneous seeds, to buy seeds that are suitable for local planting, and good seeds, once planted and found that there are yellow leaves, top dressing and additional foliar fertilizer spraying in time to ensure sufficient nutrients required for corn growth.

2.The depth of sowing is best between 3-5cm, if it is found that the sowing is too deep, if the seedlings are missing, the seedlings should be replenished in time; Weak seedlings should be sprayed with foliar fertilizer to alleviate them.

3.Control the amount of seeds at the time of sowing, and then carry out the seedlings when the corn has 3-5 leaves after the seedlings emerge, pull out the crowded corn seedlings, don't be reluctant, this is good for the corn behind.

4.Corn is a nitrogen-loving crop, in the nitrogen fertilizer must be given enough, if in the sowing, nitrogen fertilizer application is too little, it is necessary to add urea in time to promote the normal growth of corn.

Yellow wilt of corn bottom leaves may be suffering from stem base rot.

Spray with 5% leaf brate + 25% Ruixin mildew powder (600 times liquid) or 58% Ruifu manganese zinc powder (600 times liquid) and other drugs in the flare stage.

What to do if the leaves at the bottom of corn are yellow and wilted? Dictum medicine ah gall pesticide. after bile pesticides. There are several pesticides that specialize in treating this. Go find one that you have locally, and it should be good to catch up when you're done.

But never buy food and wear it hundreds of times. Don't think that people will do it without you looking at it, and you can give up. You look at the things you like, and you use your own income to carry the frustration of the snails.

According to the different varieties of corn, the corn leaves are about 12-18 pieces, while the ordinary medium and late maturing corn is about 16 pieces, among which the upper, middle and lower three leaves of the corn ear have the largest leaf area and the longest functional period. So, what causes the yellowing of the planted corn leaves?

1. When there is water shortage or waterlogging, the upper leaves first appear curled, and in the case of sufficient nitrogen fertilizer, they are still dwarf and weak, the leaf clusters turn yellow-green, and the leaf edges or leaf tips turn yellow when they are severe, and then the leaf tips or leaf edges of the lower leaves dry up. This is due to the obstruction of respiration and nutrient transport in the corn root system, resulting in yellowing of the leaves.

2. Potassium deficiency yellow leaves, when potassium is insufficient, the old leaves begin to lose green and necrosis, and gradually develop to the middle leaves, fading green from the tips and edges of mature leaves, first spotted, and then connected into pieces. When potassium deficiency is severe, there are necrotic spots on the leaf tip and leaf margin, and the leaf margin dries up and forms a charred shape.

3. Zinc deficiency yellow leaves, corn is a zinc-loving crop, in the 3-5 leaves of corn, the leaf veins in the middle of the new leaves lose green, easy to appear light yellow band area, after jointing the old leaves and diseased leaves in the midrib also appear yellow-white strips, or irregular yellow patches on both sides.

4. Sulfur-deficient yellow leaves, when sulfur is deficient, the new leaves first yellow, then the stems and leaves turn red, sometimes the new leaves are uniform yellow, the leaf tips and leaf bases remain light green, and the old leaves are red at the base. The symptoms of sulfur deficiency are somewhat similar to those of nitrogen deficiency, but nitrogen deficiency is the first symptom on the old leaves, while the symptoms of sulfur deficiency are the first to manifest on the young leaves, because sulfur is not easy to move in the corn body.

In addition, yellowing of corn leaves may also be caused by certain pests and diseases.

In addition to the natural aging factors, the yellowing of corn bottom leaves is also related to factors such as drought, waterlogging, soil poverty, fertilizer damage, pesticide damage, insect pest, soil deficiency, light level, dense planting, and maturity. Not only a single factor can cause the yellowing of the leaves at the bottom of the corn, but also the mixing of multiple factors can cause the yellowing of the leaves at the bottom of the corn. Therefore, the yellowing of the leaves at the bottom of corn needs to be correctly judged in time and the crux of the problem can be found out before symptomatic control measures can be taken. First, natural aging; Any plant has the function of metabolism and the introduction of the new; The bottom leaf of maize is the earliest germinating maize reproductive tissue, and it is also the earliest important reproductive tissue responsible for maize photosynthetic transformation, chlorophyll synthesis, and cyclic nutrient transmission. When the corn continues to grow, when the upper leaf plays the role of corn reproduction, the bottom leaf also completes its historical mission and gradually enters the senescence period; The specific characteristic of maize leaves in the reproductive decline period is leaf yellowing.

Questions. Thank you!

The yellowing of corn leaves may be caused by lack of water and drought, which will cause the upper leaves of the young corn plants to roll up and be dark, and in severe cases, the leaf edges or leaf tips will turn yellow and dry up; It may also be caused by pests and diseases, such as the mealybug insect at the seedling stage, which will be concentrated in the base, root and leaf sheath of corn seedlings near the surface, absorb the juice, and cause the corn leaf sheath to turn yellow and dry up; It can also be caused by nitrogen deficiency, which can lead to dwarf corn plants and pale leaf color, especially at the base.

This shows that the corn field is not very transparent, so the leaves below are not able to get enough sunlight, so this situation occurs. Part of the reason may be that the lack of water is a kind of self-protection of corn, so the leaves under it begin to turn yellow to prevent some nutrients and water from being wasted.

The first is that there are a lot of bugs in the ground that cause the leaves to turn yellow, the second is that they are lacking in fertilizer and nutrients, and the third is that you don't have enough to water them.

Some are aging, some are benthic worms in the roots, and some are not well developed, so you can apply some foliar fertilizer.

Summary. Hello, I'm glad to answer for you, the leaves under the corn are yellow, the reason may be caused by drought, or it may be caused by a lack of nutrients, and another reason is that the bottom leaf life has arrived.

The leaves under the corn are yellow, what is the reason.

What is the cause of yellowing of the leaves underneath the corn.

Hello, I'm glad to answer for you, the leaves of Xiangsen under the corn are yellow, the reason may be caused by drought, or it may be caused by a lack of nutrients, and there is an ear of banquet bucket The reason is that the bottom leaf guess grinding piece life has arrived.

What is lacking. Dear, you need symptomatic treatment.

Not due to drought.

Dear, nitrogen deficiency will also be yellow.

Iron, zinc, manganese, magnesium, etc. can cause different symptoms of yellow leaves, pro.

The yellowing of the lower leaves is generally a lack of nitrogen, pro.

Dear, hello, if the whole leaf is yellow, this may be the real stupid knowledge of corn ** stain, such as the macular spread all over the leaves, this is caused by fungal ** staining, you can use methyl mildew root irrigation, or use mancozeb spray mixed with water, of course, there is a lack of trace elements, such as magnesium deficiency and boron deficiency, etc., which will make the whole plant wither, dwarf, leaf veins yellowing and so on.