Why are vegetable seedlings in greenhouses easy to die in spring?How can I remedy this?

It may be that the soil is not fertile, it may be that there is more watering, it may be that there are pests and diseases, there may be a problem with the transplanting time, it may be caused by lack of water and fertilizer;After this happens, you must water it in time, you must do a good job of drainage after watering, and you must choose the right insecticide or herbicide according to the type of crops planted.

At this time, the temperature of the outside gradually increases, which sometimes leads to a large change in the temperature in the greenhouse, which may cause the soil to dry out quickly, and may also produce a lot of pests and diseases. At this time, it is necessary to water in time, apply organic fertilizer in time, and dispose of problematic plants in time.

Because of the lack of light, there is a problem with the soil, so it is necessary to pay attention to ventilation and need to be replanted.

There are many reasons why vegetable greenhouses often die after being planted for a long time.

1. The humidity of the plastic greenhouse itself is too large, the ventilation is not smooth, and the ventilation cannot be ventilated in time, resulting in the aggravation of the virus and the multiplication of germs.

Second, planting vegetables in a field for many years and many years, no stubble, no crop rotation is the main reason.

Growing vegetables is different from growing crops, and growing vegetables in a plastic greenhouse is different from growing vegetables in the open field. Growing vegetables in a plastic greenhouse, due to the closed space, the humidity is high. Growing vegetables in a greenhouse for many years will accumulate a large number of viruses, germs, and pests on the land.

The remedy is nothing more than disinfection of the soil before sowing or transplanting, fumigation, and it must be disinfected 2-3 times a year. But this is only a palliative, not a cure.

In order to effectively control diseases and pests, it is necessary to implement a land rotation system to allow the land to have a period of rest. The land rotation period is 3 years, that is, after 3 years of planting in a greenhouse, the planting will be stopped for one year, and the land will be deeply turned and frozen for one year. If there are 2-3 greenhouses, it is best to grow vegetables instead.

Even if land rotation is implemented, it is necessary to avoid growing the same vegetable for a long time in a greenhouse, and some dishes should be avoided (

chóng) stubble, such as nightshade vegetables. Eggplant can generally only be planted in a field for 3 years at most, beyond this period, there will be fruit loss and rotten fruit during the fruit-producing period of eggplant seedlings. Tomatoes are the same, but the disease manifestations are different.

Growing other vegetables in the same plot for a long time will be less susceptible to diseases than nightshade vegetables, but the quality of vegetables will decrease year by year, and the yield will also decrease.

Please refer to your personal experience.

<> "Vegetables in greenhouses must be ventilated and transparent before they grow and bloom in vain. Plants should be pruned to ensure they have adequate light, sunlight and UV rays.

It also has a bactericidal effect. Tillage, weeding, loosening soil, maintaining soil permeability, in the infiltration stage, can be 20% mancozeb.

Spray water once, if dead seedlings and rotten root mud are found, they should be removed in time and harmlessly treated.

It is used to control the dead skin of vegetables.

and rotting root insecticides include 20% oxazoline, carbendazim.

Methyltobaziterine, avermectin.

Mancozeb, etc., sprinkle water in time to prevent dead and rotten roots. Please consult the agronomist at the plant protection station for dosage or location instructions. Dead plants and decaying roots caused by bacteria.

If it is caused by bacteria, it can be disinfected with a fungicide during the soil making process, and then soaked in the roots with a microbial fungicide or sprayed to the seed stage during colonization. If this happens during growth, the dead mud is first removed, then the disease is controlled with a chemical fungicide, and then avoided with a microbial agent every 7 days. It works well and does not develop resistance.

Plant death and root rot due to ongoing logging and soil problems. We have the greenhouse effect.

The same crops are usually grown all year round, which can easily lead to continuous harvesting. In this case, first of all, the crops should be managed rationally and the amount of organic fertilizer (after fermentation and maturity) should be increased; The second is to use microbial agents to improve the soil. Soil treatment agents can also be used with vibeli wood or lime nitrogen to avoid dead and rotting sowing.

There are many reasons for death and decaying mud. In addition to the above control methods, another important method is to use more microbial agents such as Polysynax, which is a good fungus to control dead and decaying mud. Through the promotion experiment in recent years, the effect is very good, the rotten roots are divided into several rotten roots, soft rot and pests, all of which are destructive diseases during the sowing period, once it seems, there is almost no possibility of saving lives, so don't believe too much that the effect of the drug is good, which is related to human cancer.

Similarly, even if some can be saved, the cost is high, and the quality of the seedlings is not very good, and the prevention of these diseases in the early infiltration stage is a priority.

It may be that the temperature of the greenhouse is too high, or it may be that the ventilation environment is not good, the lack of moisture, and insect pests will cause the greenhouse vegetables to die. First of all, you must prepare for ventilation, you have to hand over more water, the daily temperature is not too high, it is okay to keep it at about 25 degrees, and you must do a good job of insect control, which can play a role in improvement.

It should be improved by spraying pesticides, doing a good job of field management, draining and weeding more, and keeping the soil dry.

Summary. The dead lettuce seedlings in the greenhouse in winter are mainly root diseases caused by excessive moisture. In winter, the lettuce in the greenhouse is basically planted with film, and the water is dissipated slowly, and if the watering is too large, it will cause the seedlings to die.

You can use Liangdun + Garinong + rooting agent to irrigate the roots, or you can use the root combination of middle farmers to irrigate the roots (Ruimiaoqing + copper hydroxide). It is necessary to control the water first, control the water down, and let the roots be irrigated later.

Is there a specific **?

The dead lettuce seedlings in the greenhouse in winter are mainly root diseases caused by excessive moisture. In winter, the lettuce in the greenhouse is basically planted with film, and the water is dissipated slowly, and if the watering is too large, it will cause the seedlings to die. You can use Liangdun + Garinong + rooting agent to irrigate the roots, or you can use the root combination of middle farmers to irrigate the roots (Ruimiaoqing + copper hydroxide).

It is necessary to control the water first, control the water down, and let the roots be irrigated later.

How to prevent and control diseases in the seedling stage of greenhouse and greenhouse vegetables? With the rapid development of today's social economy, China's science and technology are constantly improving, and the rapid update of products is a very good phenomenon. But it also has a negative impact, namely environmental pollution, which is now often referred to.

Environmental pollution includes air pollution and water pollution.

and soil pollution, the most serious of which is soil pollution. China is a big producer of agricultural products, but at present, the soil on which agricultural products depend is suffering from huge pollution, which directly affects the quality of China's agricultural products. Almost all of the food we eat grows out of the soil.

<> if the soil is heavily contaminated, it will directly threaten the safety of the food we eat. From the above discussion, it can be seen that the prevention and control of soil pollution and the development of pollution-free agricultural products are very important to our daily lives. Soil is the basic resource on which human beings depend for survival and an important foundation for agricultural development.

For crop growth, there is often an imbalance between supply and demand, and attention must be paid to adjustment, especially when people intentionally or unintentionally add various "harmful" elements to the soil that are not conducive to growth, so that the soil and water bodies are polluted, which will lead to the deterioration of agricultural quality and affect human health. Therefore, soil quality is directly related to the quality of life of humans.

Soil-borne diseases have long been considered to be one of the most common diseases in plant communities, and are the most prevalent and most harmful in greenhouses, greenhouses and open fields. Soil-borne diseases are mainly related to the temperature and humidity of the local soil, and are affected by tillage and management methods.

impact. Constant temperature and humidity continuous cropping vegetable greenhouses are more prone to soil-borne diseases, which have a great impact on the yield and quality of crops.

In recent years, with the expansion of high-efficiency cultivation areas of greenhouse eggplant, watermelon, cucumber, melon, etc., due to the difficulty of low-toxicity chemistry in crop rotation, soil-borne pathogens have accumulated year by year, and a variety of crop root rot, bacterial wilt, wilt, seedling wilt and wilt have appeared in a variety of crops, such as root rot, bacterial wilt, wilt, and wilt, and pathogenic nuclear disease, stem blight, brown millet disease, cotton disease, and carbon jaundice.

Bacterial canker disease, bone marrow necrosis disease, powdery mildew and gray mold, as well as various fungal and bacterial diseases and other soil-borne root diseases. Common soil-borne diseases in vegetable greenhouses include: cataplexy at seedling stage, standing blight, melon wilt, nematode disease, root rot, etc.

Due to continuous planting, repeated stubble retention and improper fertilization, crop dead trees and root rot have increased year by year. Common disinfectants have developed severe resistance to soil-borne diseases that are extremely harmful to crops.

In recent years, the occurrence of vine blight disease has become more and more serious, and in order to better prevent the occurrence of disease, in addition to the land resources that must be turned over at the same time, the application of bacterial fertilizer and drugs to dip the roots, it is also necessary to often use the way of applying drugs or bacterial fertilizer to promote roots and prevent diseases. When the vegetables are just planted, the underground pests like to gnaw the roots, resulting in the withering of small seedlings on the ground, and the seedlings fall when it is more serious, and the microbial fertilizer can not only give the fertilizer effect for the growth of vegetables, plus the flora to prevent vine blight disease, and at the same time can also improve the drought resistance and lodging resistance of vegetables.

The excessive use of organic fertilizer, excessive centralization, or the single use of a certain type of organic fertilizer will greatly increase the occurrence of fertilizer damage, resulting in root burning and burning seedlings, resulting in vegetable seedlings falling and dead trees. Therefore, in order to avoid the occurrence of fertilizer damage, it is necessary to reduce the amount of organic fertilizer and apply microbial fertilizer and organic fertilizer. However, it should be noted that organic fertilizers must be sufficiently fermented, otherwise it will also lead to fertilizer damage.

Especially in the application of pig manure, duck manure and other organic fertilizers as base fertilizer, it must be applied in advance through continuous high temperature simmering shed to make it sufficient.

Vegetable seedling collapse occurs from time to time due to disease, which is the root cause of stem rot and disease, which often occurs after vegetable planting, and has a greater relationship with the deep planting layer. The vegetable planting is too deep, the tip of the seedling stem is buried in the soil, the early stage is less and too much, the external environmental temperature is too high, and the water volatilization is fast, resulting in the environmental temperature at the bottom of the stem is too high, and the surface mechanism at the bottom of the stem is damaged, which creates a resource advantage for the pathogenic bacteria. Therefore, when planting vegetables, we must pay attention to the appropriate shade, and the best solution is ridge planting.

If the temperature of the ground and the water is more than 5 degrees apart, then after watering, it will cause sudden changes in soil temperature and damage to the rhizome, which will harm the rhizome to digest and absorb water, resulting in physiological drought. Therefore, it is best to irrigate when the water temperature is close to the ground temperature, and it is best to store the water in the room for a period of time in winter, or add warm boiled water to raise the water temperature to 15-20 degrees Celsius before irrigation. The watering time is generally after 10 am and 4 pm, remember not to water at night, which will increase the probability of disease susceptibility and cold damage.

In the process of waiting for delivery, we should pay attention to fertilization, first fertilizer, and then wait until a period of time to carry out top dressing, which can prevent this situation.

When planting, we must pay attention to the protection of the soil, but also pay attention to the cleaning of the soil, and also pay attention to the disinfection of the soil, so as to prevent the dead seedlings.

1. Fully decompose farmhouse fertilizer. When planting, if you use some manure such as chicken manure and duck manure as base fertilizer, you must combine fertilization with high-temperature stuffy sheds, and then apply it after it is fully fermented and rotted. 2. Pay attention to the dosage of acupuncture.

Whether it is dipped in the root or applied by acupoints, you must pay attention to the dosage. Because after the pesticide is applied, the pesticide is in direct contact with the root system of the plant, which is easy to cause root injury, root burning or smoked seedlings, resulting in the delay in the emergence of vegetables or dead seedlings after planting. 3. The planting depth should be well grasped 4. Watering should be timely and appropriate.

In the process of greenhouse planting, it is mainly caused by soil diseases, and there are also certain factors caused by pre-rot vegetable diseases caused by too humid greenhouse environment. In the process of vegetable planting, prevention is the main thing, and the principle of drug assistance is the principle. For diseases, they can only be prevented with drugs.

For different diseases, different proportions of drugs are used for prevention and control, and organic pesticides are now mainly used in the planting process to reduce drug residues in vegetables, at least without affecting people's health.

<> Greenhouse Vegetable DiseasesHow to disinfect traditional greenhouse plantsDiseases are not a particular problem for greenhouse crops. But for vegetable farmers, these are very common things, and each has its own set of governance methods. For some disinfection measures before greenhouse planting, there are generally two things that need to be done, one is to disinfect and sterilize the soil growing in the greenhouse, and the other is to disinfect and sterilize the walls and plastic film in the greenhouse, but these two things play a decisive role in the future of the greenhouse planting process.

Simmering greenhouse soil disinfection greenhouse soil disinfection sterilization This is a very important part of the greenhouse soil, after the first crops. The first thing to do is to remove crop straw or weeds and detoxify them at a distance from the greenhouse. Because there will be a certain amount of bacteria in these straws or weeds.

After the cleaning is completed, it is necessary to disinfect the soil in the greenhouse. As far as the disinfection method of greenhouse soil is concerned, the general method is high-temperature stew disinfection. And this disinfection method requires a specific time, that is, it needs to be in the summer high temperature season, and the disinfection and sterilization effect is the best.

Fumigation and disinfection greenhouse plastic film and wall disinfection facilities are relatively simple to disinfect germs, and disinfection can be carried out after soil disinfection is completed. In other words, the disinfection can be done before planting, and the methods used are relatively simple. This is a method of smoke disinfection.

When using smoke reagents for disinfection, it is necessary to ensure that the greenhouse is well sealed. Otherwise, the smoke reagent will not be able to stay in the greenhouse for an effective time, and it will not be able to destroy the bacteria in the walls and crevices of the greenhouse. In other words, the better the sealing, the better the disinfection effect of smoke reagents and drugs on the overall facility in the greenhouse.