Why does corn have purple seedlings? How can it be prevented?

Corn is a food crop that integrates grain crops, concentrate feed, production and processing, and power and energy. The normal nutritional and reproductive growth of the field is closely related to the corn seeds, the temperature of the growing area, rainfall, light and the skill of the grower. When any of these elements are inconsistent with the biological characteristics of corn growth, corn plants will show abnormal growth.

Such as the condition of corn purple seedlings in the title.

Due to the reversal of ultra-low temperature of corn seedlings, the metabolism in the body of corn plants is disturbed by external objective reasons, the permeability of somatic cells in the body is reduced, and protein degradation is blocked, resulting in the growth and growth of corn plants is stunted, personal quality is reduced, and nutrient metabolism is reduced and dry matter accumulates, so that the leaves turn from dense to blue-purple. It is caused by phosphorus deficiency. The cause of phosphorus deficiency is the lack of phosphorus in the soil, and the growth of corn cannot be supplemented with available phosphorus from the soil.

Secondly, the corn rhizome is underdeveloped, and the ability to absorb nutrients from the soil is too poor, resulting in the phosphorus nutrients absorbed from the rhizome are far from meeting the phosphorus requirements of corn growth, so the corn plants on the ground mainly show the symptoms of nutrient deficiency. Such as the leaf and petiole occurs blue-purple. The purple seedling condition of corn generally accounts for the majority in the 3-4 leaf stage of corn in early spring, and a small part of the species is the characteristics of corn seedling stage, and the purple seedling condition will disappear with continuous growth.

However, most of them are planted too early, which is caused by the harm of ultra-low temperature and cold wave weather, coupled with the lack of phosphorus**, and the chlorophyll synthesis is affected.

For corn purple seedlings, generally as long as they are not planted too early, in order to bypass the corn 2-3 leaf stage ultra-low temperature hazards more watering, in addition to the use of developed roots, good cold tolerance species, and more organic fertilizer, increase phosphorus and potassium fertilizer, can also be very good to prevent the generation, for ultra-low temperature before the coming, to prevent soil drought, when the field environment humidity is too large, that is, cold can also be prevented, fusion spraying cold-resistant agent plus dihydrogen phosphate leaf fertilizer, generally stronger. If the purple seedlings occur in the field, generally not serious will gradually disappear with the rise of temperature to recover, if the blue-purple leaves are more purple seedlings are more serious, it is advisable to immediately spray the concentration value of potassium dihydrogen phosphate plus Bihu Wodanzhou star, which is good for rapid relief and improvement, and is conducive to the production of vigorous seedlings, conditional integration of soil, increase soil temperature, and promote root growth will be better.

In the Northeast, corn is planted earlier, in early spring"Pour the spring cold"Chilling injury will cause the whole corn seedlings to turn red or purple. In this case, with the increase of temperature, the phenomenon of purple seedlings will gradually alleviate and disappear in the later stage.

It may be affected by low temperature weather, at this time, it is necessary to keep warm in time, you can use foliar fertilizer in time, and you should also use plant growth regulators.

It may be that the use of pesticides is unreasonable, or it may be that there is a lack of elements. At this time, trace elements must be supplemented in time, and high concentrations of fertilizers must be avoided.

Corn is a multi-functional crop integrating grain, feed, processing and energy. The normal nutrition and reproductive growth of the field are closely related to the corn seeds, the temperature, precipitation, light and grower technology of the growing area. Corn purple and red seedlings generally start from the 3-leaf stage, the 4-5 leaf stage is obvious, and the 7-8 leaf stage still does not fade; The main reason for the purple and red seedlings of corn is that the root system is underdeveloped, the stem is small, and the growth is slow, which can lead to leaf death.

If there are more purple leaves and purple seedlings are serious, it is advisable to spray the concentration of potassium dihydrogen phosphate plus Bihu plus Meizhou star in time, which is better for rapid relief.

Purple seedlings caused by phosphorus deficiency are more common, such as when applying base fertilizer, too much attention is paid to the amount of nitrogen fertilizer, and phosphorus fertilizer is neglected, this reason can be alleviated by topdressing some phosphorus fertilizer, or foliar spraying of potassium dihydrogen phosphate, and the remediation is timely and has little impact. If the permeability of the soil is very poor, the corn seedlings will not be able to breathe normally, and the corn seedlings will also "suffocate" purple. The reason for this may be the long-term accumulation of water in the soil; It can also be caused by the soil being too compact.

Before planting, carry out a pest prevention in the soil to remove pests, or sow them together with pest control drugs at the time of planting.

<> corn seedlings turn purple for a number of reasons. First, at the seedling stage of corn, there is more rain, and the drainage of corn field is not smooth, resulting in long-term soil humidity, which affects root respiration and metabolism, and then the growth is hindered, and finally malnutrition and red purple; Deficiency of corn growth elements can also lead to purple seedlings, but purple seedlings caused by deficiency of corn seedlings only exist temporarily. Corn is a very adaptable crop, in the field of normal long-term continuous cultivation, improper application of fertilizer or insufficient use of fertilizer, top application of phosphorus fertilizer, such as superphosphate, spraying foliar fertilizer, such as potassium dihydrogen phosphate, both methods can be, appropriate can also be supplemented with some trace elements at the same time.

This is because the corn was not fertilized well after it was planted. Therefore, there are some phenomena of purple seedlings appearing in corn. So I had to plant it well.

Stagnant water at the seedling stage. The moisture requirements of the soil for corn emergence are not too high, and the plots under the condition of yellow moisture can also emerge normally. If there is too much rain during the corn seedling stage, which causes water accumulation and soil compaction, it will affect the growth of corn roots, and in this case, it is easy to have purple seedlings.

The corn seedlings I planted are purple-red, and I need to check the characteristics of the corn leaves, and make up for what is missing.

Corn seedlings have relatively large nutrient requirements in the three-leaf stage, and the normal color is green. Corn is a kind of food that we usually eat, and its growth cycle is divided into seedling stage, ear stage and grain stage. Eating corn is relatively simple, but planting corn should pay attention to many details, such as planting corn when the temperature is not lower than 8, and the air humidity should be about 60%, and it should be planted in a place with air circulation.

Generally speaking, when corn planting enters the three-leaf stage, the demand for external nutrients will be relatively large. The main thing is that the roots and leaves begin to change, so the watering should be appropriate and the nutrients should be replenished in time. Normal corn seedlings are green, and the changing edges begin to differentiate.

Corn seedlings are purple-red and need to be observed to make up for what is missing. Normally, corn will appear purple red when it is deficient in potassium. The edges and tips of the leaves are purple and dry, but the middle of the leaves is still crumpled green.

At this time, 150 times potassium dihydrogen phosphate can be sprayed at the bottom to prevent and treat. If the stems and leaf sheaths appear purplish-red, but the leaves are yellowish-white, magnesium deficiency is considered. At this time, you can spray calcium, magnesium, phosphorus fertilizer or magnesium sulfate at the bottom to prevent and **.

Among them, it is necessary to exclude the symptoms caused by pests, diseases and pesticides. However, in some places, enough fertilizer has been sprayed in time, so yo ah check whether the permeability of the land is enough. The fertilized soil is not enough, some are suddenly sticky, and the surface layer of the living soil is too shallow for the corn to absorb effectively.

At this time, in addition to fertilization, it is necessary to use methods such as intercropping and crop rotation to make the quality of the land looser.

Of course, when the temperature is low, the activity of transportase proteins in the root cell membrane is too low to cause purple red, so it is necessary to take timely measures to keep warm.

The reason why the corn seedlings you planted appear so red is a sign of a lack of potassium fertilizer, and in this case, you can use some potassium dihydrogen phosphate. In addition, it is possible that the plant fungus is infected with rust, so it is recommended that you use some stone sulfur mixture.

This variety of corn seedlings, we must pay attention to proper fertilization, watering, weeding at the very beginning, if there is a problem, you can spray some drugs in advance, so that you can do it.

In the process of corn planting, if the seedlings appear red and purple, it may be caused by the lack of a certain element in the soil, or it may be caused by weather or infected with pests and diseases, in addition to the low-lying water in the field, the soil is too sticky, the sowing is too deep or too shallow, and the seedlings are burned due to improper fertilization, and the seedlings are poisoned due to improper treatment.

When the field is poorly drained and the soil moisture is high, it will affect the respiration and metabolism of the root system, causing the plant to be malnourished and appear red and purple. In addition, when the root system of a seedling is bitten by an underground pest such as needleworm, it will affect the ability of the root system to absorb nutrients, resulting in the seedling weakening and forming red seedlings.

When corn is planted, if the base fertilizer is not used properly or if there is a lack of certain elements in the soil, it will cause the corn seedlings to turn red and purple. In this case, what we need to do is to supplement the soil with reasonable elements. Soil phosphorus deficiency decreases root absorption capacity, and chlorophyll synthesis is blocked, resulting in leaves turning from green to purple.

After the emergence of corn, if it encounters low temperature, it will often make the corn leaves turn red or purple, but with the increase of temperature, the phenomenon of red seedlings will gradually alleviate and disappear in the later stage. For land lacking phosphorus, phosphorus fertilizer should be added when using base fertilizer. Increase the application of phosphate fertilizer as base fertilizer, generally apply 40-50 kg of superphosphate and decomposed and fermented organic fertilizer per mu as base fertilizer.

Once purple seedlings appear, foliar sprays can be applied 2-3 times with potassium dihydrogen phosphate; Level the land and dig drainage ditches so that the rain stops and the water dries up, and the fields do not accumulate water. When corn is planted, if it encounters low temperature or extreme weather, it will affect its root development, thereby affecting its absorption of phosphorus, and will also cause the seedlings to turn red and purple. In response to this situation, all we can do is to do a good job of prevention.

Corn seedlings red and purple can be reasonable coating treatment for corn seeds, to prevent low pests, for seedlings that are too shallow, can be watered in a timely manner, cultivated loose soil to protect moisture, so that the seedlings become stronger. Flat the land and do a good job of drainage, for the situation that red seedlings have appeared, the foliar spray of 300-500 times of industrial-grade potassium dihydrogen phosphate, sprayed once every 3 days, to supplement nutrition for the seedlings. When using pesticides or fertilizing, it is necessary to use them strictly according to the instructions for use.

Many farmers have reported that the corn seedlings in the field appear purple red, and there are generally more reactions, what is the matter with the purple red corn appearing?

This phenomenon of corn purple and red seedlings mostly occurs in the 3-leaf stage and 4-leaf stage, and some still do not fade when they grow to 7 or 8 leaves. Some are only partially reddish-purple. In severe cases, the entire leaf sheath and stem are purplish-red. happens"Red sprouts"There are many reasons, mainly due to the following reasons.

1. Sowing factors, sowing too deep or more straw in the field, or more local soil clay, resulting in too shallow sowing, difficult to take root, weak root system, weak ability to absorb water and fertilizer.

2. Phosphorus deficiency in plants, phosphorus deficiency in corn, can not meet the growth needs of corn seedlings, root growth and development is hindered, seedling growth is slow, due to the gradual reduction of phosphorus content in the seedling plant, so the leaves change from dark green to red or purple.

3. Underground pest hazards.

The root system of seedlings is bitten by underground pests (such as needleworm, ground tiger, and Spodoptera exigua), and the root system weakens its ability to absorb water and fertilizer, resulting in the weakening of the seedlings and the formation of red seedlings.

4. Water accumulation in the field.

After sowing, rain or watering and water accumulation affect the emergence of seedlings, water accumulation in the field, soil moisture is large, affecting the respiration and metabolism of the root system, and the growth of the root system is hindered, resulting in plant malnutrition and redness and purple.

5. Soil compaction and salinization are severe, resulting in poor root activity of corn, affecting seedling emergence, hindering root development, and even root rot.

6. Pesticide pests, insect pests and fertilizer damage can also cause corn seedlings to turn red.

7. Pesticide pests and insect pests cause the obstruction of sugar metabolism in corn seedlings, and produce a large number of anthocyanin glycosides, and then form purple-red seedlings.

Prevention and control measures:

1. Early application of phosphate fertilizer should be based on fast-acting phosphate fertilizer, and 15-20 kg of superphosphate can be applied per mu.

2. Level the land, dig drainage ditches, so that the rain stops and the water is dry, and the water in the field can be removed in time.

3. To do a good job in the prevention and control of underground pests, the seeds can be coated twice, and 2 kg of 1% clothianidin granules can be sprinkled per mu.

4. For sowing too shallow or early seedlings, it is necessary to water in a timely manner, and cultivate loose soil to protect moisture to promote strong seedlings.

5. If red seedlings have appeared in the field, spray 10 ml of brassinolide, 50 grams of potassium dihydrogen phosphate, and 30 ml of amino acid water-soluble fertilizer per mu, spray once every 7 days, and spray 2 times continuously.

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It is necessary to pay attention to the use of fertilizer, apply fertilizer on time, so that it can be well controlled, and pay attention to light.

The appearance of purple and red seedlings is mainly due to the lack of phosphorus in the soil, the soil is moist and the temperature is low. Prevention and control should be carried out according to the corresponding situation.

It is necessary to use suitable fertilizer, water on time, and fertilize on time, so that better control can be carried out.