Leek seedlings are finely leafy, how to improve it?

It is necessary to supplement organic fertilizer in a timely manner, and also grasp the concentration of fertilizer, properly loosen the soil, and ensure the air permeability of the soil.

You can fertilize the leeks more, or to ensure that the soil of the leeks is fertile, the humidity should be appropriately reduced.

You can fertilize, you must pay attention to the density of planting, pay attention to the planting environment, so that you can better solve the problem.

Why do leeks get thinner and thinner? What to do if leek leaves turn yellow? The main reasons why leeks are getting thinner and thinner are as follows:

1。If fertilizer is not applied in time after each harvest, the lack of fertilizer and water will lead to poor growth of the next crop of leeks. The leek leaves will weaken and turn yellow.

If you harvest it too often, the leeks will weaken. When harvesting leeks, it is advisable to harvest 4-6 times a year with 6 leaves as the harvesting standard. If the quality of the leeks is poor, the harvest can be postponed, and the leek stems should be removed in time to reduce nutrient consumption.

3. Root system problems: low ground temperature in autumn and winter leads to fragile leek roots, or maggots destroy the leek root system, resulting in poor nutrient absorption of leek roots, and one crop grows thinner than another.

The more the leeks are cut, the finer the solution will be.

1. Timely top dressing. After cutting a stubble of leeks, you can bury some rotten chicken manure in a ditch and cover it with *. In this way, when watering, the fertility penetrates and the nutrients are transferred directly to the root system of the leek, so that there are enough nutrients to support the continued growth of the leek in the next crop.

In addition, plant ash can be sprayed to add various nutrients to the soil.

2. When the root guard is just cut with leeks, don't pour a lot of water. Too much watering can easily lead to root rot. In addition, if the old roots are forked, the old roots should also be cut off in time, leaving only the new roots for cultivation.

3. Reasonable cultivation * can be carried out within 3-5 days after the harvest of leeks*, generally 2 cm thick sand * can be sprinkled directly on the top, which can promote the continuous tillering of the storage roots of leeks, the growth and development of the root system, and is conducive to the absorption of nutrients.

4. On the one hand, maggot control can timely clean up the remaining branches, dead leaves and weeds on the edge of vegetables, thereby reducing the hatching rate of larvae and the emergence rate of adults. On the other hand, in the adult emergence, 2500 3000 times of low-toxicity pyrethroid pesticide or 1000 times of 75% phoxanthion can be sprayed on the boundary surface, which can directly kill the adult insects. In general, the more chives are cut, the finer they become.

The main reason is mismanagement. Every time you cut a leek, you should promote its rejuvenation. At the same time, do not harvest too often to ensure the quality of the leeks.

It is because the frequency of straightening in the process of growth is becoming less and less, so it will lead to thinner and thinner. It may be that there are some diseases, which can be carried out with some corresponding drugs**, and crop rotation can also be carried out, and more watering and fertilization can be carried out.

It may be caused by a lack of nutrients, we must water more and fertilize more, so that we can better solve the problem, most of the yellowing is caused by a lack of elements.

If each stubble of leeks is not topdressed in time after harvesting, it is easy to cause poor growth of the next stubble of leeks. Leek leaves will become thinner and yellow. Low ground temperature in autumn and winter leads to weak root system of leeks, or maggots damage the root system of leeks, resulting in poor nutrient absorption of leek roots, and one stubble is thinner than the other.

Leeks are yellow, and the longer and thinner they are, they may be lacking in nutrients or in insufficient light.

There are two reasons for the fact that the yellow leaves of leeks are getting thinner and thinner.

First, leeks lack nutrients, that is, lack of fertilizer. Fertilization is required, and the chemical fertilizers used are urea, organic fertilizer, compound fertilizer, and so on. However, it is best to use farmyard fertilizer as the first choice.

After the leeks are harvested, the rotted farmhouse manure can be spread in the middle of the leek row spacing, and then a hoe can be used to turn the row spacing shallowly.

Then, after the use of fertilizer, the leeks that grow must be green and lush, especially robust.

The second is the lack of water. Because, in the process of leeks growing, a lot of water is needed, and the ground often needs to be kept dry and wet, so that the leeks can grow green and fertile.

Qingying said Nongda.

From the point of view, the soil environment of leek field is not good, resulting in poor ability of root system to absorb nutrients, which affects the growth and development of leeks. Leaf spray brassinolide or Bihu + Phyfane (amino acid) + Stekop regulates relief. Root Chongmu Meitu Root Baby + Strong Root Dragon, improve the rhizosphere soil environment, promote root nourishment and strong roots, in order to help the growth and development of leeks.

The landlord did not explain the specific condition, and there are the following references:

Yellowing of leek heart or outer leaves**:

Soil acidification leeks like neutral soil, long-term application of a large number of manure, cake fertilizer, manure and ammonium sulfate, superphosphate and other acidic fertilizers, will cause soil acidification, so that leek leaves grow slowly, slender, outer leaves yellow.

Harmful gases are harmful to the application of a large amount of ammonium bicarbonate before the shed, or the application of urea on the ground behind the shed, and the application of ammonium sulfate on the alkaline soil, all of which are easy to produce ammonia and cause ammonia damage. In addition, if there is too much accumulation of nitrite acid, nitrite gas damage will occur.

When the indoor temperature of the shed is above 35 for a long time, and the air is relatively dry, it is easy to cause leaf burning. Sometimes the continuous cloudy day is followed by a sudden sunny day, or the sudden invasion of cold air after high temperature, will make the leek leaf tips and even the whole leaf turn white or yellow withered.

trace element imbalance, zinc deficiency, yellowing of heart leaves; Calcium-deficient heart leaves yellowed, and some leaf tips died; magnesium deficiency outer leaves yellowing and death; Boron deficiency center leaves yellow, too much boron leaf tip die; The central leaf of manganese excess is slightly yellowed, and the outer leaf is yellowed and died. The control methods were Henan 791, Mashang leek, Hanzhong winter leek, broad-leaved leek and other varieties with strong resistance (tolerance). Rational use of manure and fertilizers.

Manure should be fully decomposed and applied in moderation. Top application of sulfur, iron, ammonium bicarbonate, urea and other chemical fertilizers, do not use too much at one time, do not sprinkle on the ground, to prevent sprinkling on the leaves. When a deficiency is found, micronutrient fertilizer or compound micro-fertilizer can be sprayed on the root of the disease.

Strengthen temperature and humidity management, and the temperature should not be higher than 35 or lower than 5.

There may be many reasons why leek leaves are yellow, withered, and dry and thorny. It is recommended that you take the following measures to prevent it:

Reasonable watering: Leeks should be kept moderately moist, but not too wet. Too much water may lead to a lack of oxygen in the roots, which can cause yellowing, dry hearts, dry tips and other phenomena in the leaves. Therefore, you need to control the amount and frequency of watering and avoid overwatering.

Pay attention to the amount and timing of fertilizer use: if there is a long-term lack of fertilizer, it will also lead to yellowing, dry hearts, dry tips and other conditions of leeks. You can spray compound fertilizer or organic fertilizer every 10-15 days in spring and summer, and pay attention to the amount of fertilizer used, not overuse.

Control room temperature and air humidity: The temperature suitable for the growth of leeks is about 15 -20, and at the same time, moderate air humidity should be maintained. Too low temperature and humidity may cause yellowing, withering, dry tips and other phenomena of leaves.

Timely removal of pests and diseases: Leeks are susceptible to pests and germs, such as leaf rot, discoloration, etc., should be removed in time.

I hope you can help you with the above measures, and you can continue to consult me if necessary.

The reason for the yellow leaves of leeks is that the temperature rises in summer, and they need to be watered in time to keep the soil moist and ensure air circulation. In the growing season of leeks, phosphorus and potassium fertilizer is applied once every half month, and when we use too much fertilizer, the concentration is too high, so that there is a fertilizer damage in the leek, resulting in dry tips and yellow leaves. Therefore, when we fertilize, we must fertilize according to the needs of fertilizer.

Do a good job of supplementing the nutrients of leeks.

1. Leek leaves are yellowed with 100 insect powder leeks in the process of growth, it is easy to suffer from the harm of leek maggots, the leaves will gradually turn yellow, and insecticides need to be sprayed in time. In the morning of each day, spray the diluted 100 worm powder solution, water in time, promote the absorption of leek roots, ensure air circulation, and the leek leaves will gradually improve.

Second, the reason for the yellow leaves of leeks Leeks like a warm environment, and when the temperature exceeds 35 in summer, leeks will stop growing. The environment is dry, the air is not well circulated, and bacteria and insect pests breed in large numbers. In summer, you need to water in time to ensure that the soil is in a moist state, and you can sprinkle more water in the leek leaves and air to cool down and moisturize.

The growth of leeks is inseparable from sufficient nutrients, and if the nutrients are insufficient, the leeks will appear yellow leaves. Ensuring the slight acidity of the soil can promote the continuous growth of leeks. In the growing season of leeks, phosphorus and potassium fertilizers can be applied at a frequency of once a month, which can continuously promote the growth of leek leaves, which are not only green but also dense.

Prevention and control methods should be rescued according to the cause:

1.Disease. Mainly blight and gray mold. It can be carried out with the corresponding pesticides**.

Disease prevention and control methods.

1 Crop rotation. The cultivation land and seedling land should choose a plot that has not been planted with onion and garlic vegetables within 3 years.

2 Level the land. Renovate the drainage system in a timely manner, so that there is no water accumulation in the furrow after heavy rain, and the waterlogging pits are eliminated.

3. Cultivate robust plants. If you take cultivation measures such as selecting strong seedlings when planting seedlings, removing diseased seedlings, paying attention to raising roots, not harvesting too much, topdressing after harvesting, and controlling irrigation after summer, the plants can grow robustly.

4 bunches of leaves Before the summer rainfall, the lower yellow leaves should be removed, the green leaves should be pulled up, and tied with horse grass pine to prevent the nine leaves from touching the ground, so that the plants can be ventilated and prevent diseases.

5 pesticide prevention and control from mid-July to early August, use 600 to 800 times of 25% methacryl wettable powder, 500 times of 64% anti-virus alum wettable powder, 0 1% to 0 2% copper sulfate solution to irrigate the roots and stems of plants, or use the above liquid to dip the roots when planting.

Botrytis control methods.

In the early stage of the disease: it is necessary to use 1000 times of 70% methyl tobuzine wettable powder and 50% carbendazim wettable powder 500 times of liquid, plus 1500 times of the liquid of promethexin, 1000 times of 50% of Suclin wettable powder, 50% of the liquid of Pythium 1200, 50% of the gray mold rather than 500 times of the liquid, etc. In addition, if you give the medicine once every 1 week, you can take it twice in a short period of time to relieve the condition.

Severe disease period: 50 ml of mildew can be added to 10 to 15 grams of 40% pyrimecoamine suspension per mu, and then there are about 15 to 20 40% Pythium wettable powder, about 15 kg of water is added, and 800 times of azoxycyclamine can be used once every 3 to 5 days, and the number of sprays is appropriately changed according to the different conditions of the development of the disease. Spraying needs to be used in windless weather, if it rains after spraying, it should be sprayed again after rain, which can also effectively prevent and control gray mold fungus and achieve the purpose of increasing production and income.

2.Pest. Mainly nine maggots and thrips. Timely application of medication.

Nine maggots a, spray 50% phosphine emulsifiable concentrate 800 times or 50% cyanocyanide chloride emulsifiable concentrate 3000 times in the peak stage of adult emergence, and the best effect is applied at 9 to 10 in the morning;

B, in the larval pest period, when the tip of the leaves of nine vegetables began to turn yellow, soft, and gradually lodging to the ground, that is, should be treated with medicine, you can choose to use 50% phosphine emulsifiable concentrate 1000 times liquid or 80% trichlorfon soluble powder 1000 times liquid watering.

Thrips: Irrigate the roots 3000 to 5000 times using 25% thiamethoxam water dispersible granules.

3.Trace element deficiencies can also cause dry-pointed yellow leaves. If there is a lack of calcium, boron, iron, zinc and other trace elements, you can spray sea foliar fertilizer to supplement trace elements and increase nutrients.