In autumn, what causes yellow leaves to appear in leeks?

Leeks are one of the vegetables that farmers love to grow, but when people plant leeks, they will find that the newly planted leeks grow green and thick, and when they are harvested several times, the leeks begin to grow yellow leaves, which not only affects the quality of leeks, but also reduces the yield of leeks. So what causes yellow leek leaves? And how to solve it?

The first reason is that there are too many harvests. Leeks have a strong ability to regenerate, so they can be harvested after planting, but if leeks are harvested too often and the interval between them is too short, the leeks that grow back will start to have yellow leaves. The reason why this is so is because leeks consume a lot of nutrients when they grow, and there are too many harvesting intervals each time, and the leek root system has not had time to store nutrients to the leek leaves, resulting in the leek root system has been in a state of nutrient deficiency, resulting in the situation of leek yellow leaves.

Solution: Reduce the number of harvests, increase the interval between each harvest of leeks, and stop harvesting in the summer so that the leek root system can better store nutrients. When the leeks are planted for four to five years, it is time to consider stubbling the leeks.

The second reason is that the temperature is too high. Leeks are cold-loving and heat-tolerant crops, when the temperature has been kept above 30 degrees, the leaves of the leeks will evaporate water very much, so that the leaves of the leeks begin to wither and yellow.

Solution: In summer, when the temperature is high, it is necessary to build a sunscreen net on the leeks to prevent the leeks from being exposed to direct sunlight, and replenish the moisture of the leek leaves in time when the temperature is low in the morning and evening, so as to reduce the harm of leaf transpiration to the leek leaves. If the leeks planted in the greenhouse have yellow leaves due to high temperature, it is necessary to control the humidity and temperature in the greenhouse, and pay attention to the ventilation in the greenhouse.

The third reason is improper fertilizer management. Leeks are fertilizer-loving crops, and harvesting fertilizer should be applied in time after each leek harvest to supplement the nutrients needed for the growth of leeks in time. However, if the fertilizer concentration is too large or too much nitrogen fertilizer is applied to the leeks, it will cause the leeks to burn the roots, resulting in the phenomenon of yellow leaves.

Solution: If you apply farmhouse fertilizer after leek harvesting, you must ensure that the farmhouse fertilizer is completely rotten, because farmhouse fertilizer will emit a lot of heat when it is rotten, and if the farmhouse fertilizer is not completely rotted, then the heat emitted when the farmhouse fertilizer is rotten will burn the leek roots. In addition, do not water and fertilize immediately after harvesting, generally in the top dressing 2-3 days after the leek harvest, if the top dressing immediately is easy to make the leek root wound infection, infection disease, yellow leaves.

The fourth reason is caused by soil compaction. Leeks are perennial crops, long-term application of chemical fertilizer to leeks is easy to lead to soil compaction, acidification, leeks grow in acidic soil for a long time, soil compaction will also affect the leek to absorb soil nutrients, and leeks will appear yellow leaves for a long time.

Solution: In order to avoid the long-term topdressing of leeks with chemical fertilizer, acidification, it is best to choose farmhouse fertilizer when topdressing leeks, and you can also apply plant ash, plant ash is alkaline, and contains potassium essential for the growth of leeks, so the appropriate amount of topdressing plant ash can not only alleviate soil compaction acidification, but also help the growth of leeks.

In autumn, not only leeks but also many plants will have yellow leaves. This is because as the temperature and light conditions change, the production of chlorophyll decreases, and the proportion of lutein increases.

Deficiency factors. Crops need a variety of elements and trace elements to grow, especially boron, calcium, etc. If there is a deficiency of nutrients, it will cause yellow leaf disease.

It is also possible that the plant lacks nutrients, so nitrogen and potassium fertilizers should be supplemented in time to promote the growth of plant rhizomes and regular watering.

In general, this situation is likely to be caused by malnutrition, so you should usually apply a little more fertilizer. You also have to apply a little pesticide every month.

It is likely that the plant lacks nutrients, and nitrogen and potassium fertilizers should be supplemented in time to promote the growth of plant rhizomes. Regular watering and ventilation.

There are many kinds of diseases that cause leaf rot in leeks, and the main environment is low temperature and high humidity, especially high humidity. There are five kinds of infectious diseases that can cause leek leaf rot: leek gray mold, leek blight, leek cotton blight, leek's bacterial yellow leaf disease, and leek soft rot.

There are many types of diseases, but there are still certain rules for the use of drugs, which are not very complicated, and follow the rules when compounding pesticides: gray mold + blight + bacteria, which can comprehensively prevent and control the rotten leaf disease of leeks.

The pH of the soil is on the high side.

Leeks prefer relatively neutral land, and are not suitable for growing in acidic or alkaline soils, especially acidic soils are very unfavorable to its growth. When growing leeks, if the pH of the soil is too high, or if the fertilizer applied at a later stage is acidic, the whole soil will be acidified. Long-term growth of leeks in such soil will cause flower acid disasters.

The leaves of the leeks will grow very slowly, causing the tips of the leeks to dry up at the end.

The causes of yellow leaves of leeks include excessive harvesting and heavy harvesting, heavy soil acidification and compaction problems, improper use of fertilizers, etc., as follows:

1. Leeks are harvested too often and too heavily.

One of the most important principles of planting leeks is to raise good roots, only when the root system of leeks is raised, we can harvest leek leaves, and when harvesting leek leaves, we should pay attention to maintaining a reasonable interval and a reasonable degree of harvesting, otherwise it will increase the nutrient consumption burden of leek plants, affect the normal growth of leeks, and then cause leeks to yellow leaves.

2. The problem of soil acidification and compaction is serious.

Whether the leek leaves grow well or not, the key depends on whether the root system is strong or not, the root is strong, the seedlings are auspicious, the leaves are fat and green, the roots are weak, the leaves are yellow and thin, and the factor that has the greatest impact on the root system of leeks is the soil environment of the planting site. Generally speaking, the more leek is planted and the more acid fertilizer is used, the more serious the problem of soil acidification and compaction, the more yellow and thin the leaves of leeks, and the worse the yield and quality of leeks.

3. Improper use of fertilizer.

The main reasons for the yellow leaves of leeks caused by improper use of fertilizers are as follows: the first is the insufficient supplementation of medium and trace elements, and the lack of iron, zinc, copper, calcium, boron and magnesium during the growth period of leeks will induce yellow leaves; The second is the use of a large amount of raw manure or incomplete rotting farmhouse fertilizer, selling feasts or excessive use of chemical fertilizer, both of which will cause leeks to be damaged and yellow leaves.

Precautions for growing leeks

Pay attention to the removal of weeds, you should know that summer is a good season for the growth of leeks, and it is also conducive to the growth of various weeds, but because the leek plant is relatively low, it likes full sunshine, and it needs to water the leeks at ordinary times, and pay attention to fertilizing the leeks, and then do a good job in the daily management of wine and vegetables, which can help it grow.

Pay attention to control the vigorous growth of leeks, Zhongxiang leeks grow more vigorously in summer, so many growers in order to enhance the nutrients of leeks, generally will regularly fertilize leeks, you can add some phosphorus and potassium fertilizer to leeks, but do not apply nitrogen fertilizer, so that leeks will not grow, in ordinary times need to pay attention to the leek shading, do not apply too much fertilizer, so as not to cause leek root rot, increase phosphorus and potassium fertilizer to ensure that it will not grow.

Pay attention to the prevention of leek moss, leeks in the moss and seeds, will consume the nutrients of leeks, so in the usual time need to remove the leek moss, so as to avoid the consumption of leek nutrients, and then ensure the growth of leeks, if you like leeks, you must master the correct method, fertilization must not be excessive, so that leeks can grow better.

Leek yellow leaves are because of too many harvests, too high temperature, improper fertilizer, soil compaction guide high staring, to appropriately shorten the interval between harvesting leeks, reduce the number of harvesting, summer high temperature to build a sunscreen net on leeks, in the morning and evening when the temperature is low to provide water in time, after the leek harvest can be applied fully rotted farm fertilizer, but also can be applied grass ash, so that the soil is alkaline.

Leek yellow leaf causes.

1. Too many harvests:Leeks are vigorous, so they can be harvested all the way after planting, but if they are harvested too often and start harvesting after a few days, they will cause the leeks that grow again to begin to have yellow leaves.

2. The temperature is too highLeeks are cold-loving and heat-tolerant crops, when the temperature has been kept above 30 degrees, the leaves of the leeks will evaporate water very much, so that the leaves of the leeks begin to wither and yellow.

3. Improper fertilizer:Leeks are fertilizer-loving crops, and they should be topdressed after each harvest to supplement the nutrients needed for the growth of leeks in time, but if the fertilizer concentration is too large or too much nitrogen fertilizer is applied to leeks, it will cause leeks to burn roots, resulting in yellow leaves.

4. Soil compaction:Leeks are perennial crops, long-term application of chemical fertilizer to leeks is easy to lead to soil compaction, acidification, leeks grow in acidic soil for a long time, soil compaction will also affect the leek to absorb soil nutrients, and leeks will appear yellow leaves for a long time.

Treatment method for yellowing leek leaves.

1. It is necessary to appropriately shorten the interval between harvesting leeks, reduce the number of harvesting, and stop harvesting in summer, so that the root system of leeks can better store nutrients.

2. In summer, when the temperature is high, it is necessary to build a sunscreen net for the leeks, and provide moisture in time when the temperature is low in the morning and evening.

3. After the leek is harvested, you can apply fully rotted farmhouse fertilizer, in addition, do not water and fertilize immediately after harvesting, wait for 2-3 days and then top dressing, if the immediate top dressing is easy to make the leek root wound infection, infection disease, and yellow leaves.

4. In order to avoid the long-term topdressing of leeks with chemical fertilizer, it is best to choose farmhouse fertilizer when topdressing leeks, and you can also apply grass and wood ash, which is alkaline and contains potassium essential for the growth of leeks, which is conducive to the growth of leeks.

Control of yellow leaves of leeks.

Leeks smile and like light, during the growth period to let it receive all-day light, every 3-4 days to water, can be used to dry tap water, fish water or rice water, leeks like fertilizer, during the breeding period need to apply thin fertilizer, after harvesting need to wait for wounds to heal and then top dressing.

1. Improper watering.

1.Reason: Watering needs to be well controlled.

If overwatering causes too much moisture in the soil, causing damage to the root system, some of the leaves will turn yellow. If there is not enough water, it will lead to a lack of water, and the old leaves will show signs of drying up and yellowing. 2.

Treatment: If the amount of water is too much, stop watering and drainage immediately if it is not serious. If it causes root rot, it needs to be cut off and replanted.

If the amount of water is too small, it is necessary to water it in time and gradually replenish the water.

2. Excessive fertilization.

1.Reason: The fertilizer needed for the growth of leek mu is limited.

If too much fertilizer is applied, the root system cannot absorb it adequately, burning the root system and causing the leaves to turn yellow. 2.Solution:

The soil needs to be irrigated with water, and the excess fertilizer is drained to resist the beating, or the roots are washed and then the soil is replaced and replanted. At the same time, remember not to use too much acidic fertilizer.

3. Causes of insect pests.

1.Causes: The main pest of leeks is leek maggots, which can damage the plant, causing the root system to absorb less, the leaves turn yellow, and even the plant dies.

2.Treatment method: high-efficiency and low-toxicity insecticides can be used, such as trichlorfon powder, phosphine emulsifiable concentrate, etc.

Reduce the harm of leek maggots.

Summary. Hello! One is the deficiency of trace elements.

Leeks with yellow leaves are generally not applied or sprayed with trace elements such as iron, copper, and zinc, and yellow leaves are formed due to the lack of such elements. The second is the partial application of nitrogen fertilizer, and the ratio of nitrogen, phosphorus and potassium is out of balance, thereby inhibiting the absorption and utilization of trace elements and forming yellow leaves. The third is the excessive application of fertilizers containing humic acid, which changes the physical and chemical properties of the soil, presents acidification, which is not conducive to the development and growth of the root system, the absorption and transformation of nutrients is not smooth, and the leaves turn yellow due to malnutrition.

Fourth, only pay attention to the application of chemical fertilizer, ignore organic fertilizer, soil porosity is reduced, permeability is poor, and root respiration is not smooth, resulting in malnutrition and yellow leaves. Fifth, blind watering, excessive humidity in the field, affecting root respiration and nutrient absorption, resulting in yellow leaves. Sixth, the damage of diseases and insects, especially after the damage of leek maggots, the absorption capacity of the root system is reduced, the nutrition of the leaves is insufficient, and the dry and dead appear in severe cases.

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Hello! One is the deficiency of trace elements. Leeks with yellow leaves are generally not applied or sprayed with trace elements such as iron, copper, and zinc, and yellow leaves are formed due to the lack of such elements.

The second is the partial application of nitrogen fertilizer, and the ratio of nitrogen, phosphorus and potassium is out of balance, thereby inhibiting the absorption and utilization of trace elements and forming yellow leaves. The third is the excessive application of fertilizers containing humic acid, which changes the physical and chemical properties of the soil, showing acidification, which is not conducive to root development and growth, poor nutrient absorption and transformation, and yellowing of leaves due to malnutrition. Fourth, only pay attention to the application of chemical fertilizers, ignore organic fertilizers, reduce soil porosity, poor permeability, and poor root respiration, resulting in malnutrition and yellow leaves.

Fifth, blind watering, excessive humidity in the field, affecting root respiration and nutrient absorption, resulting in yellow leaves. Sixth, the damage of diseases and insects, especially after the damage of leek maggots, the absorption capacity of the root system is reduced, the nutrition of the leaves is insufficient, and the dry key is dead in severe cases.