What is the cause of yellowing of the leaves when planting garlic?

The temperature in winter is higher than that of previous years, and the precipitation is also less, and many garlic farmers have reacted, and garlic has begun to appear in a large area of yellow leaves and dry out. The specific symptoms are that the leaf tips of garlic plants turn purple-red, gradually develop to the leaf sheath along the leaf veins, lose green and turn yellow, and the whole leaf is dry and dies in severe cases.

Garlic leaves appear yellow leaves, dry, easy to lead to garlic root stunted development and death, even if the disease is mild plant growth is short, garlic sprouts become thin and short, serious will not sprout, and the final diameter of the garlic head is about 5 cm.

1) Partial application of chemical fertilizers, ignoring the application of organic fertilizers and micro-fertilizers, and the concentration of stagnant water solution is too large, resulting in root burning and affecting absorption;

2) The tillage layer is too shallow, the depth of the ground is less than 10 cm with a tractor rotary plow, the soil is compacted, after rain or watering, the water can not seep down, and accumulates on the surface, resulting in the chemical fertilizer in the clay can not penetrate into the underground layer in time, and the solution concentration near the garlic root system is too high to cause root burning. Due to the good permeability of sandy soil, a large amount of chemical fertilizer seeps into the lower layer of the soil, which reduces the concentration of soil solution, and rarely burns roots.

3) In continuous cropping plots, not only the concentration of soil solution is too high, but also root rot, wilt and other diseases, resulting in yellowing of leaves.

4) In winter, the temperature is high and the precipitation is low, resulting in poor soil moisture or high soil moisture;

5) Repeated cold snaps to cool down the plants;

6) Pests and diseases; Plants are deficient in calcium, magnesium and other elements;

7) Herbicide damage, excessive use of herbicides (such as acetochlor) after garlic sowing and before emergence.

All of the above are easy to cause yellow leaves and dry symptoms.

1) Choose a white garlic clove with no injury or disease, and a single weight of more than 5 grams as seed garlic.

2) It is best to implement a 3-year crop rotation with wheat, corn, melons, beans, nightshades, potatoes and other crops.

3) Rational application of basal fertilizer. Deeply plough the land 25-30 cm. Before sowing in heavy crops, 5 6 kg of carbendazim or thiophanate-methyl were sprinkled per mu for disinfection and sterilization.

4) The application of chemical fertilizer should take the principle of a small amount of many times, and after returning to green in the spring of the following year, in the formation period of garlic sprouts and garlic heads, timely combined with watering and top dressing. Sowing at the average daily temperature of 20 22 degrees, the sowing date of garlic covered with plastic film is delayed by 7 10 days compared with the sowing date in the open field, and the seedlings should reach the standard of strong seedlings before wintering.

5) When the soil moisture is high, the cultivator scatters moisture. After the yellowing of leaves, the cold groundwater should be watered immediately, on the one hand, to reduce the ground temperature, to prevent high temperature damage to the root system, on the other hand, the oxygen content in the cold groundwater is higher, which can reduce the harm of root suffocation, and at the same time, it can reduce the concentration of soil solution. Spraying natural brassinin in early spring enhances the photosynthesis of chlorophyll and promotes the production of plant nutrients.

When planting garlic, if you find that the leaves are yellow, it must be a lack of fertilizer and water, so you must water it on time.

In this case, it means that you are watering too often or that the sun is too abundant. This phenomenon can also occur, so be sure to water it once every 5-7 days. And when watering, also look at the condition of the soil.

It may be that the garlic is not fertilized properly. Garlic enters the growth stage from the beginning of germination, and it needs to get a lot of nutrients from the soil, if the amount of fertilizer is too small, the garlic plant will be difficult to be robust; If the amount of fertilizer is too much, it is easy to "burn seedlings", and a large number of yellow leaves appear. At the same time, it is also possible that pests and diseases can infest the garlic, and the garlic is infected with pests and causes the leaves to turn yellow.

It's best to loosen the soil regularly and drain it in case of waterlogging.

Garlic sprouts turn yellow and the leaves are yellowed like this:

1. The leaves are yellowed due to lack of fertilizer, and various fertilizers should be reasonably supplemented according to the symptoms of fertilizer deficiency. The symptoms of garlic fertilizer deficiency are different, nitrogen deficiency will cause old leaves to turn yellow, potassium deficiency will cause leaves to dry up, calcium deficiency will cause new leaves to turn yellow, leaf tip death and necrotic spots, etc. If the garlic grows without nitrogen fertilizer, it will make the old leaves yellow.

2. The yellowing of leaves caused by fertilizer damage is generally caused by too much nitrogen fertilizer, avoid applying nitrogen fertilizer alone and nitrogen fertilizer concentration is too high, which can reduce the harm, and if there is a problem, you can dilute the fertilizer damage by watering.

3. The yellowing of leaves caused by soil compaction can be solved by improving soil organic matter content, cultivating and loosening soil and watering.

4. Lack of water or too much humidity can cause yellowing of leaves, which can be solved by adjusting the humidity.

5. Garlic maggot, sheath blight and gray mold can cause yellowing of leaves, and yellowing of leaves caused by pests and diseases can be solved by prevention and control methods, focusing on prevention.

6. Short light time and too weak light intensity can cause yellowing, which can be solved by improving the light conditions.

Popular science of garlic sprouts:

Garlic sprouts, also known as green garlic (garlic yellow when there is no light). Good quality garlic seedlings should be fresh and tender, with a plant height of about 35 cm, bright green leaves, not yellow or rotten, white hair roots and not wilted, and strong spicy.

Garlic seedlings are green seedlings that have grown to a certain period of garlic seedlings, it grows in farmland, it has the spicy taste of garlic, and its tender garlic leaves and leaf sheaths are edible.

Garlic sprouts are rich in vitamin C, protein, carotene, thiamine, riboflavin and other nutrients. Its spiciness mainly comes from the capsaicin it contains, which has the effect of dissipating food.

The treatment method after the yellowing of the garlic leaves is as follows:

1. Lack of nutrients.

1. Reason: If the raised garlic lacks nitrogen, its old leaves will turn yellow. If potassium is deficient, its leaf tips will dry out. If it is deficient in calcium, it will turn yellow in the center of the leaf and spots will appear on the leaves. If magnesium is deficient, its leaves will gradually turn yellow from the bottom upwards.

2. Treatment method: According to the symptoms it appears, choose the flower fertilizer containing the corresponding nutrients to apply to it. When applying, you should pay attention to the amount of control, and you can't apply too much.

Second, the water is insufficient.

1. Reason: If the fruit is not watered for a long time when the fruit is maintained, the empty tung makes it appear short of water, then it may also cause it to appear yellow leaves.

2. Treatment method: pour some water into its soil to replenish water. But be careful not to water too much at once, and add water to the soil in small amounts and many times.

3. Lack of light.

1. Reason: If there is a lack of light in the place where it is maintained, it may also have the problem of yellow leaves because it cannot synthesize nutrients.

2. Treatment: Change it to a well-lit place to raise. If it's not easy to move, you can use an electric light to fill it up.

The yellowing of garlic leaves may be due to a lack of nutrients, so according to the symptoms it shows, choose the corresponding flower fertilizer and apply it to it. It may also be due to a lack of water, and it needs to be watered in its soil at this time. It may also be due to a lack of sunlight, so you need to move it to a well-lit location or fill it with electric lights.

What to do if the garlic leaves turn yellow is as follows:

1. The soil is too hard for garlic to absorb nutrients, resulting in yellow garlic leaves.

Reason analysis: If the soil where garlic is planted is too hard, it is not conducive to ventilation and drainage, and hinders the respiration of the roots. In addition, the soil is hardened, so that the watering and fertilizer can not penetrate into the soil well, and the garlic roots will not be able to absorb nutrients in time.

If the nutrients are not delivered in time, the leaves of the garlic will start to turn yellow slowly.

Solution: In this case, the soil should be turned over in time, loosened the soil, loosened the soil, and increased the softness, air permeability and drainage of the soil, so that the water and nutrients can be infiltrated in time, so that the garlic roots are conducive to absorption.

2. To top dressing, insufficient nutrition, lack of nutrients, resulting in yellowing of garlic leaves.

Reason analysis: In the growth period of planted garlic seedlings, if there is a lack of nitrogen fertilizer, the old leaves of garlic will turn yellow. If potassium is lacking, the leaves of garlic will dry out.

If there is a lack of calcium, there will be spots on its leaves, the heart leaves will be yellow, and in more severe cases, the tips of the leaves will die, and if there is a lack of magnesium, its leaves will gradually turn yellow from the bottom up.

Solution: Observe the growth of garlic regularly, apply fertilizer according to the actual situation, pay attention to the amount of chemical fertilizer when applying, and not apply too much, especially nitrogen fertilizer.

3. Lack of water causes garlic leaves to turn yellow.

Cause analysis: If garlic is not watered for a long time during the daily growth period, so that it has the problem of lack of water, then it may also cause it to appear yellow leaves.

Solution: Pour some water into the soil where the garlic is grown to hydrate it. But be careful not to water too much at once, and add water to the soil in small amounts and many times.

Yellowing of garlic leaves can be caused by impermeable soil or lack of fertilizer. The cause of yellowing of the leaves should be identified first and targeted to be solved. If the soil is not breathable, it is necessary to do a good job of turning and changing the soil, so that its roots can breathe smoothly.

If it is caused by a lack of fertilizer, it is necessary to apply fertilizer according to the situation, but the amount of ammonia fertilizer should not be too much. If it is caused by excessive fertilization, irrigation should be carried out to dilute the fertilizer.