What are the causes of cramped cramps of cream lettuce heart leaves?

Lettuce leaf heart fold is leaf scorch, lettuce growth period of an important disease, distributed in all places, the rate of diseased plants is generally 30% 50%, serious disease plots can reach more than 80%, seriously affecting the planting efficiency of farmers. Today, I will lead you to understand the symptoms, causes and preventive measures of lettuce leaf scorching disease for farmers' reference.

Symptoms: Lettuce leaf scorching disease significantly affects the yield and quality of lettuce, causing the outer leaves or heart leaf edges to turn brown, some necrosis, and some affect the leaf veins. After leaf water loss, the leaf color is light, the veins are scorched or the leaf veins are necrosis, the leaf moisture is seriously insufficient, and the leaves are scorched or the leaf margins are scorched or dry.

Causes: In the event of high temperature and low humidity, the water in the leaves will be depleted, and the cells at the edge of the leaves will die. Similar symptoms occur when the root system absorbs too little water, inhibiting water transport.

Weak root growth, dry and low temperature soil, high salt concentration and other factors can hinder the water absorption of plants, especially for adult plants, due to the large and large leaves, water loss is prone to scorching symptoms.

Precautionary measures: 1. Reasonable crop rotation, preferably with grasses.

Implement 2-3 year crop rotations.

2. Advocate the application of well-rotted organic fertilizer, and select disease-resistant varieties, and use new high-fat film to dress seeds before sowing to repel underground pests and diseases, isolate virus infection, do not affect germination and swelling function, strengthen respiratory intensity, and improve seed germination rate.

3. Keep the soil moist and water content during the lettuce growth period.

Appropriate, avoid too high and too low temperature, and at the same time protect the normal function of the root system, relative humidity.

It should not be too high for a long time, try to keep the humidity normal, increase air circulation, and help prevent the leaves from being damaged.

4. Timely topdressing, cultivating and weeding, improving the disease resistance of plants, and spraying strong stems to make plant stalks thick and leaves hypertrophied, and improve the natural taste of lettuce.

5. In the early stage of the disease, spray targeted agents such as chlorothalonil and methyl tobuzine according to the requirements of plant protection.

At the same time, it is combined with the spraying of 800 times of the new high-lipid film to enhance the efficacy, improve the utilization rate of the active ingredients of the agent, and consolidate the prevention and control effect.

It may be because of the problem of variety, in fact, there are many varieties like this, or it may be because of some influence of the natural environment.

What are the reasons for the cream lettuce, the new leaf Hyun Bin is not well packaged, it is easy to cause simplicity and transportation, and it is easy to cause this side if you are not careful.

Some of the rolls in the leaves of the cream lettuce are caused by the lack of energy during the production of the cream lettuce.

How many places, you have to take medicine two or three times to completely recover.

In the maintenance process, generally every year after the spring flowers to replace the soil, the ratio of garden soil, humus, river sand is 2:2:1, you can add a small amount of bone meal. The soil is loose, fertile and slightly acidic, which is conducive to the growth of longevity flowers.

In summer, the temperature is high and the air humidity is low, resulting in curling. The flowers can be placed in a cool place to reduce water evaporation. At the same time, the spray spray is added. Carefully observe the leaves for signs of disease and insect activity. If there is, carbendazim can be sprayed to remove the virus.

As long as you fertilize him once a year, it will never appear because of the lack of fertilizer, the leaves will start to dry up, and the leaves will curl. I don't think it's a case of lack of fertilizer.

This plant loves sunlight, and if it doesn't see sunlight, it will produce curly leaves, and the bromeliad flower tries to let it see more sunlight, at least more than five hours of light a day.

This is caused by insufficient watering of the leaves and yellowing of the flowers. Caused by untimely watering. The symptoms of yellowing of old leaves are mainly in Lige Begonia, the new leaves at the top grow normally, and the main reason for the yellowing and falling off of old leaves is the lack of water in the potting soil.

The local soil has not been changed for many years, the potting soil is not breathable, the fertilizer is excessive, and there are many nutrients. The causes of leaf curling, scorching, and the onset of the disease in spring, summer and autumn are also varied. In spring, summer and autumn, the air humidity is low and the temperature is high.

Poor watering is an important cause of leaf curling.

When fertilizing, we can use some conventional fertilizers, such as some balanced compound fertilizers, organic fertilizers are OK, it is not recommended to use some fertilizers that are not rotten, or some liquid fertilizers that are difficult to ferment.

I think it's a matter of breed. This is not the case with low air humidity or lack of water. You should be in an area with heating or warm winters. It's very good.

Improper handling of this "factor" can lead to the appearance of dry leaf edges in gardenias.

Creamy raw town heng dishes have some hearts and some are not hearty. The problem of variety, the lettuce of the wrapping heart is called the bun lettuce, and there is a kind of rolled leaf lettuce called the pine leaf lettuce Dan chain, the market is generally sold cream lettuce and glass cabbage lettuce, it is recommended to choose the bunch, it is more delicious.

From the point of view of **. This one is still relatively close to cream lettuce, but its leaves are narrower than cream lettuce.

The lettuce you send should be creamy lettuce. How to tell if it's cream lettuce, you just see if it looks like lettuce, because it is a variant of lettuce, it tastes slightly sweet and bitter, it belongs to the genus Lettuce of the Asteraceae family. The leaves of cream lettuce are in the shape of clusters of flowers, the leaves are green, and the heart leaves are hugging or not hugging.

Is cream lettuce like this? I'm sorry to say that I haven't seen it either.

Lettuce is like this, if you go to the market, you can ask them, you can buy a little more, it's delicious.

If you don't have a figure, it's troublesome to do, and it looks like it's like um, you can look it up on the Internet again.

That's right, that's what cream lettuce looks like.

Look at the picture This is cabbage lettuce, I don't know if it's called cream lettuce.

Cream lettuce is a variant of lettuce, sweet and slightly bitter, green in color, crisp and tender in taste, and named because it is suitable for raw eating. It belongs to the genus Lettuce of the Asteraceae family, which is an annual herbaceous crop. It contains more dietary fiber than cabbage, which can eliminate excess fat.

Is this cream lettuce? I look and feel more like a cabbage.

You can make stock cream lettuce, cold dressing, stir-fried.

If you look at it, this is creamy lettuce.

Yes, that's generally the case.

Yes, cream lettuce is like that.

1. The shape of the leaves is different.

Cream lettuce: The leaves are clustered, the leaves are oval-shaped, and the heart leaves are hugged.

Italian lettuce: the leaf surface is wrinkled, the heart lobes are slightly embraced, and generally do not bulb.

2. The color is different.

Cream lettuce: Emerald green in color.

Italian lettuce: leaves turquoise.

3. The taste is different.

Cream lettuce: Sweet and slightly bitter, crisp and fragrant.

Italian lettuce: crisp and delicious on the palate.

4. The growth period is different.

Cream lettuce: It can be planted in 2 seasons a year, and the harvest period is from April to May and October to November.

Italian lettuce: It can be planted for 4 seasons a year, and the growth period is short.

5. The growth characteristics are different.

Cream lettuce: The growth characteristics are more heat-tolerant, not cold-tolerant.

Italian lettuce: adaptable, heat-tolerant, cold-tolerant, and resistant to sprouting.

Creamy lettuce.

Cream lettuce is a kind of lettuce, its leaves are oval, tender green, the leaf surface is flat, the middle and lower parts are wrinkled, and the commerciality is good.

The leaves are soft, the taste is oily, and the taste is slightly sweet.

Nutritive value. The edible part contains as much water as 94% to 96%, so the raw food is crisp and refreshing, especially fresh and tender.

Italian lettuce.

Served with crisp leaves, Italian lettuce is one of the most nutritious vegetables that city dwellers love. Growing high-yield, high-quality, drug-free lettuce is the common desire of urban consumers and producers. Lettuce has a short growth period and can be planted for 4 seasons a year.

Scientific name in Chinese. The Latin scientific name of lettuce.

lactuca sativa l. var. ramosa hort.

Also known as Italian lettuce.

Phylum Angiosperms.

Class Dicotyledons.

The main reason for the germination treatment of lettuce is that it is difficult for lettuce seeds to germinate under high temperature conditions, and there is a dormancy period for the new seeds of the year, so lettuce seeds planted in summer and autumn need to be germinated. Different varieties of lettuce, different regions, are slightly different in planting, such as spring, the temperature is from low to high, and the summer has been at a high temperature, so you need to choose a more heat-resistant variety, such as cream lettuce.

Seedlings in the low temperature season and summer sunscreen, rain-proof washing, should be covered with plastic film or straw curtain, seedlings unearthed after the first busy removal of the mulch, and so on the cotyledons become hypertrophied, when the true leaves begin to vomit, and then remove the mulch, and on the same day watering 1 time.

The soil for cultivating lettuce is best to be loose, fertile and well-drained lead ridges, which can avoid stagnant water and affect the growth of seeds. Lettuce likes cold climate, does not like high temperature environment, but is not cold-tolerant, and grows at a temperature of 15-20 degrees, so it is sown for a long time, so it is sown from August of the current year to February of the following year. Of course, the best sowing time is in October and December, and plant hormones can also be used to soak the seeds to achieve the purpose of germination.

Place the seeds in 100 ppm cytokinetin solution and soak for 2-5 minutes. Lettuce in different periods, the demand for water is also different, lettuce in the seedling stage can not be too wet or too dry, lettuce topdressing is recommended to use urea, fertilization every 10 days can be, if the climate is dry to be suitable for the town to be watered.

Choosing the right soil is very important, although it is a cliché. The cultivated soil should be "loose" and "fertile", and at the same time, it should be well drained to prevent the development of lettuce seeds from being affected by soil water accumulation, which will cause rot. Lettuce seeds germinate need light, so the sowing depth should not be exceeded, especially after pelletization, the seeds have been wrapped with a layer of pelletizing powder, sowing too deep, easy to reduce the seed germination rate.

Qi Hanling Zen conditions: lettuce likes to be cool, and the minimum temperature for seed germination is 4, and the time is longer. The optimal temperature for germination is 15 20, lettuce has different growth periods, different water requirements, the seedling stage can not be dry, dusty and dry, can not be too wet, too dry seedlings are easy to age, too wet seedlings are easy to grow.

Select good quality cream lettuce seeds, evenly sprinkle them in fertile nutrient soil, the distance between the seeds should not be too high, and apply organic fertilizer appropriately. Before planting, a small amount of organic fertilizer coarse plum jujube should be added to the soil as a base fertilizer, which can promote the growth of plant roots.

It is necessary to choose lettuce seeds of good quality, evenly sprinkle them in the fertile nutrient soil, the gap between the seeds should not be too high, and organic fertilizer should be applied appropriately. Before planting, a little organic fertilizer should be added to the soil as a base fertilizer, which can well promote the growth of the middle row of the plant rhizome.

Let's grow in all seasons, when you sow the seeds, you have to look at the local climate, the winter is particularly cold or the summer is particularly hot, the germination of lettuce will grow. It's warm in winter to walk through small arch sheds or greenhouses. Growing lettuce is usually relatively good for spring or autumn planting, but this is also related to the local climate, the southern hometown, except for summer, early autumn is too hot for lettuce, the growth of planting, planting letters are very good at other times, and the management is also better.

If you want to seed lettuce to sprout, the climate is relatively suitable. It's too cold, too hot. The temperature is usually not less than 15 degrees and not less than the normal temperature of 25 degrees; In addition, lettuce seeds have very small and thin grains, planted instead of seedlings, dirt is destroyed, the seeds favor the germination of the seeds, and the seeds are broadcast.

It is necessary to sprinkle seeds or wet water, the seeds are covered with dirt. Pay attention to watering moisture to benefit seed germination; Worryingly, the weather suddenly cools or warms, and it is possible to retain moisture by mulching straw, thus creating a better environment and benefiting the seedlings.

If you want to grow lettuce can't finish it, you can choose more. If you have a long round shape to 10-12cm, you can put the plants at a certain distance, diligent is watering, lettuce a lot. After picking up the leaf, I will take it after 1-2 times, the longer it grows, the longer it grows; I planted all the leaves, not the whole plant, you can pick it up and it's pretty good.

It is in the summer of the whole year, when the weather is too hot, the temperature during the day is above 30 degrees and slightly below 2-3 degrees, and the open sowing is very unfavorable for the germination and growth of lettuce seeds. If you want to sow seeds, you have to make good sunscreen, otherwise it will be difficult after the seedlings, the township cabbage tries to sow seeds, there is no sunscreen, the soil, the soil is getting hotter, after 10 days, still no seedlings are seen.

It's hot, see what you can mix with the vegetables, and of course, lettuce is the first option, because lettuce is crisp, nutritious, and delicious anyway. It's summer, and if you're preparing to grow vegetable dishes, you should take care to control the temperature. The natural temperature during the day exceeds 32 degrees, which is easy to manufacture or seedlings, and high-legged seedlings are not conducive to management.

Summer vegetables should be seedlings for the first time, after exercise, control the temperature, improve the quality of seedlings with high quality semi-determined velocity, and improve the quality of seedlings.

Lettuce is planted in the open garden, in addition to the winter, it can also be planted for three other seasons, let the **lettuce seeds, clean twice for the first time, and then drain the surface moisture, which can be smeared, reveal the semak, and control the amount of water, and control the amount of water later. Grow slowly with lighting, avoid long-term breakouts, and can be eaten after 40 days.