How to solve the problem when radish is planted in a cold shed in winter and encounters diseases?

In the growth period of radish, too much irrigation produces the phenomenon of rooting, and some tissues appear hypoxic; The soil is compact, hard, and poorly aerated; Boron is missing in the soil; Boron is an indispensable trace element for crop growth, due to various reasons resulting in boron deficiency in radish, the flesh will turn yellow, black, hollow or rotten, sometimes accompanied by rough epidermis and cracking symptoms.

Prevent the occurrence of black rot in black-hearted radish. In this way, it is necessary to use drugs to prevent it, and it is recommended to soak the seeds before planting the radish, and the "Fumeishuang" solution is used. After planting, you can use "desemin" to spray to do a good job in the prevention of black heart disease.

It is necessary to irrigate reasonably, strengthen cultivation and weeding, loosen the soil, maintain soil permeability, supply sufficient oxygen to the roots of radish, and promote its healthy growth. Drain water in time after the rain, so that there is no water on the ground after the rain, and prevent the ground plate knot caused by water accumulation and cause black hearts.

In the later stage of growth, radish lacks sufficient trace elements, especially boron fertilizer. The absorption of boron is affected by uneven fertilization during fertilization, or the amount of fertilizer is uneven, the weather is high temperature and drought, etc., resulting in boron can not be absorbed by radish normally.

Carry out seed disinfection treatment before planting, and use 50% Fumei double wettable powder or 35% methacryl seed dressing agent to dress seeds, or soak seeds in 50 warm water for 25 minutes, and then immediately move into cold water to cool, dry and cultivate, spray 75% chlorothalonil wettable powder 600 times liquid at the beginning of the disease, or 70% mancozeb wettable powder 400 times liquid and other agents, spray once in 10 days. Spray 3 4 times in a row.

Planting radish is actually very simple, as long as you do a good job of soil sterilization before planting, reasonable top dressing during the growth period, and timely discharge of stagnant water in the field, you can grow good radish. <>

Pest control is mainly to do a good job of cleaning the countryside and minimize the number of insects. Prevent the accumulation of fertilizer from being sprayed by underground pests 1 time before spraying, and then sow seeds 1 week later. Radish deficiency should be applied 1 kg of borax and zinc fertilizer per mu 30 days after the emergence of seedlings, and borax solution should be sprayed outside the roots at the beginning of expansion.

Choose disease-resistant varieties and strengthen field management. After the onset of the disease, the diseased part should be removed in time or the plant should be uprooted and taken out of the vegetable garden. Then use Fu Shuangmei and other agents to spray evenly throughout the garden to eliminate germs and prevent the spread of the disease.

Spraying is mainly applied to the affected area. When applying this medicine, it is best to add some foliar fertilizer, such as potassium dihydrogen phosphate, boron fertilizer, etc., which can also save labor. In addition, while increasing the temperature, it is also necessary to properly ventilate to reduce the occurrence of diseases.

After winter when the temperature is extremely low, radishes will grow slowly and even suffer from frost damage. After cooling, two layers of film should be set up to increase the temperature inside the shed. Compared with other heating methods, the secondary film addition is also convenient, and the humidity in the shed increases after heating.

Ventilation needs to be improved. The prevention and treatment of the disease can be carried out with methimazole and mesomycin, mainly sprayed on the affected area, and ventilated after spraying

First, the suitable growth temperature of radish stems and leaves is 15 20, and it can grow normally when it is lower than this temperature for a short time, but it will stop growing when it is low temperature for a long time. The fleshy root has a high requirement for growth temperature, and when it is lower than 6, the growth is slow. When frost occurs, when the external ambient temperature is lower than 0, the fleshy roots of radish will be frost damaged.

Second, winter and spring radishes are generally sown from October to mid-November, and harvested in February and March. If you choose a variety with poor cold tolerance, it is easy to have premature sprouts in a low temperature environment, which affects the expansion of fleshy roots, and the yield and quality decrease. The open fields in the north are not suitable for overwintering radish planting, and the entire growing season will be affected by frost.

When there is frost, the fleshy roots of radish face low temperature, consume a lot of nutrients, the cells freeze and lose water, and die, affecting the yield, and the frozen part is inedible. So, in the face of frost, how should radishes be managed? When low temperature comes, the radish that has matured should be harvested and stored in time, and the growing radish should be warmed in time to prevent frost damage.

1 Watering in moderation.

In the process of growing turnips, a lot of water is indeed needed. But if you water too much, it will cause the radish leaves to grow vigorously. If the radish field is too dry, it is enough to water a little water, as long as the ears are enough to maintain the needs of the radish growth.

In general, the soil in the turnip field should be kept moist, not too much watered, and not too little.

2. Fertilizer should be appropriate.

To plant radish, you should use less nitrogen fertilizer and more potassium fertilizer. Too much nitrogen fertilizer on the fertilizer will cause the radish leaves to grow vigorously. Applying potash fertilizer will make the radish grow bigger.

In the early stage of radish growth, you can add more nitrogen fertilizer. But when the radish starts to develop, it is best not to apply nitrogen fertilizer or to use a little less nitrogen fertilizer. A little more potassium fertilizer can make the radish grow bigger, and it will not cause the radish leaves to grow vigorously.

3 Prune the leaves appropriately.

Many farmers believe that pruning radish leaves is to break off all the radish leaves. They think that by doing so, all the nutrients will be supplied to the growth of the turnips, but in fact it is not wise to do so. Radish leaves do consume nutrients, but the nutrients produced by radish leaves through photosynthesis will also be transported like roots, and if you blindly break the radish leaves, it will make the radish grow very small.

It will not freeze and be damaged, and Luo people are more resistant to low temperatures.

Radish is a semi-cold-tolerant vegetable, the seeds can germinate at 2 -3 years, and the suitable temperature is 20 -25. The seedling stage can tolerate a higher temperature of about 25, and can also tolerate a low temperature of minus 2 to minus 3.

The temperature at which radish stems and leaves grow is 5 -25 , and the suitable temperature is 15 -20. The temperature at which the fleshy roots grow is 6 -20 , the appropriate temperature is 18 -20, and when the temperature is lower than -1 --2, the fleshy roots will be frozen.

As long as the ground does not freeze, the radish will not freeze. When storing radishes in the north, they are all in the ground, covered with a layer of soil, and the top of the soil will be frozen, but after digging up this layer of ice water, the soil below is generally soft, and the radish is placed here so that it will not be icy, which means that as long as the temperature is above 0 degrees, it will not be frozen.

Carrots planted in greenhouses due to the continuous cloudy weather, the temperature in the greenhouse is too low, the radish seeds germinate will not freeze the parent, the germination rate of radish seeds is very high, and it can germinate at two or three degrees, but the temperature suitable for radish growth is twenty to twenty-five degrees. When the radish is in the seedling stage, it can grow in a high temperature of more than 25 degrees, and it can also grow in an environment of minus two or three degrees. But when the radish reaches the growth period, the normal growth temperature is best fifteen to twenty degrees, and the temperature cannot be lower than six degrees, otherwise the radish will be frost damaged.

Extended information: Radish is planted in a large area in China, radish leaves, rhizomes, have many uses, radish is most suitable for growing at a temperature of 20 degrees to 25 degrees, the lowest can also be at 5 degrees to 8 degrees, but the temperature is best not less than 6 degrees, there will be a risk of frostbite. The moisture content of the soil is between 65 and 80 percent

It is often said that turnips in winter are the best nourishing food. In our Central Plains, many families have fewer turnips than white. Many families like to grow some white turnips.

I will introduce white radish during the planting process. Diseases and diseases, as well as preventive prevention and control methods encountered pests and diseases.

Which pests generally occur in turnips.

1 frost mold.

When this disease occurs, it is mainly damaged by strains. When the passage encounters this disease, the first is from the outermost surface of the leaf, some light green or light yellow is very small on the surface of the leaf. Then, this spot will slowly get bigger and the color will change color, this will gradually turn yellow-brown at this time, and this spot will be bigger.

The veins are blocked, making the point triangular, and there will be some white mold on the back of the leaf during dry rain. If infected with this cold mold, then the leaves will die. For this cold mold needs to be treated with chemicals**, the use of frost** and the use of zinc powder or paramanganese powder have a reasonable spraying of leaves to achieve the effect of **.

2. Black rot.

This virus is mainly a lesion caused by black rot. All of them are black: when such a lesion is present, it usually remains from the middle of the branches.

The branches of the meat turn black, then begin to rot, and eventually there will be some cavities. There are several factors that contribute to this causative infection. The weather was hot and there was too much water.

The block of the drainage system is not good, there is one after planting other crops, and one is that insects may come to this black rot, then this black rot pesticide can be made from streptomycin powder. ** and defense.

3 Viral diseases.

Radish seedlings of this disease are shorter than normal growing radish seedlings. There will be uneven color, or discoloration in the branches, the most obvious is leaf art, this virus is mainly caused by insects, generally in field management, high temperatures or drought, is a condition that causes this viral disease. This virus uses diaphragm deception, it is necessary to make the spout 2-3 times better.

The white radish is in the ripening stage, and if it is a corn bug, if it is a corn bug, there is no need to deal with it. The absence of a part of the radish does not affect the growth of the white radish, but there is a certain situation. This is the black heart of white radish, which is what we usually call black heart radish.

This disease is often a problem. Before planting turnips, it is necessary to pay attention to it. It can be used in the past to buy special powders to avoid the appearance of black carrots.

Prevention and prevention of common pests and pests in the cultivation of small park diary and turnips.

During the ripening period of the white radish in autumn, due to the rain, it will cause the turnip to turn into a turnip, which is like the feeling of the panmuelin. This is called soft erosion, this disease also needs to be considered before planting, when planting white radish for the first time, we must leave a certain gap between the cultivated land, the growth movement of the pile, as well as the excessive drainage of the long square soil using rainwater, the plant radish seeds, the plant seeds on the rectangular soil, which will greatly avoid the occurrence of soft rot.

Carry out soil disinfection and sterilization and underground pest control. Fungicide spray 50 - 600 times liquid or 70-toluene thiazine 800 - 1000 times liquid, insecticide spray 48 - 800 - 1000 times emulsifiable concentrate. Crops with less fertilizer, more residual organic matter, and no pests and diseases of the same species should be selected for planting radishes.

The insect pests of radish are mainly aphids and soft rot, and 10 million units of 12% agricultural streptomycin sulfate wettable powder per mu are added with 50 75 kg of water or sprayed with 1000 1200 times of chlorothalonil dry granules.

When planting white radish encounters insect pests, aphids can be sprayed with 800-1000 times of 40% dimethoate, or 1000 times of imidacloprid, 1500 times of 10% of the suspension agent, or 1000-1500 times of Laixi suspension, etc., and 50% phoxanthion 1000 times of the liquid is used to spray the foliage or irrigate the roots.

I think that at this time, we should prepare pesticides to spray pesticides on the radish, and clean the inside of the greenhouse, it will be very clean and there will be no insects.

When encountering insect pests, it is necessary to spray insecticides in time, and potassium fertilizer should be applied to improve the insect resistance and disease resistance of crops, increase the light intensity, which is conducive to the growth and development of crops and resist the infestation of pests.