When is the best time to spray Northeast Chinese cabbage?

The time of spraying Chinese cabbage in Northeast China is the best time to start applying pesticides at the rosette stage of Chinese cabbage.

Chinese cabbage cultivation techniques.

Cabbage is hardy and prefers a cool climate, so it is suitable for growing in the cold season. If it is cultivated in the high temperature season, it is prone to diseases and insects, or the quality is inferior and the yield is low, so it is not suitable for summer cultivation. It is very resistant to low temperatures.

After the temperature reaches minus 3, if the temperature can gradually rise, it can resume growth, but if it reaches minus 8 and the temperature continues to drop to about minus 11, it cannot resume normal growth and suffers from frost damage. Cabbage is suitable for planting in loam, sandy loam and black loess that retain fertilizer and water and is rich in organic matter, not suitable for planting in sandy soil that is easy to leak, and even more unsuitable for planting in clay soil with poor drainage.

In the north, the planting time is generally from 1 to 20 August.

Seedlings: 5 to 6 days after the emergence of seedlings, the first seedlings, to the weak and strong, strip sowing seedlings spacing 2 to 3 cm; When the Chinese cabbage has 3 to 4 leaves, the seedlings of the strip sowing plot are 8 cm, and about 3 plants are left in each hole when the hole is sown; After another 5 to 6 days, the third seedling is sent.

Seedling: The seedlings grow for about 25 days to reach the cluster stage, and the seedlings are set according to the distance between 50 to 60 cm, and about 2,000 seedlings are left in 667 square meters. If the lack of seedlings is found, it should be replanted in time, and the seedlings should be watered in the afternoon or cloudy day on a sunny day.

Cultivating and weeding: 3 times of tillage, respectively after the second seedling, after seedling setting and in the middle of the rosette. Cultivating combined with weeding.

Reasonable watering: If the bottom moisture is insufficient, water in time after sowing to ensure that the seedlings are strong and strong. After thinning seedlings and setting seedlings, water 1 water each. Watering at the beginning of the rosette promotes the growth of the trees. During the balling period, watering should be carried out in combination with top dressing, and the amount of watering should be large and uniform. In the later stage, appropriate water control promotes the core wrapping.

Timely topdressing: 667 square meters of rosette stage topdressing nitrogen, phosphorus, potassium compound fertilizer 15 to 20 yuan. At the beginning of balling, 667 square meters of nitrogen, phosphorus and potassium compound fertilizer were topdressed with 30 to 40 kg.

No more topdressing within 20 days before harvest. Combined spraying at the rosette stage with 1 spray of foliar fertilizer every 7 to 10 days for a total of 2 to 3 times, using a mixture of urea and potassium dihydrogen phosphate, sprayed after 16:00.

Harvest: After mid-November, Chinese cabbage basically stops growing and enters the harvest period. After the beginning of December, it should be harvested in time to prevent frost damage.

Chinese cabbage yield increase core agent, is made of plant growth regulator and fertilizer compound, after use, can regulate the balance of water and nutrients in the cabbage body, enhance the absorption of water and fertilizer and the accumulation of nutrients, accelerate the growth of leaves, improve chlorophyll, make it grow big, thick leaves, promote early heart, early maturity, enhance the disease resistance, drought resistance of Chinese cabbage, and non-toxic and harmless, no residue, but also improve the taste of Chinese cabbage. At the rosette stage of Chinese cabbage, 15 30 grams of 5% 24-epirupine fresh ester soluble powder can be used per mu, mixed with 30 40 kg of water to spray evenly, sprayed once every 11-15 days, and sprayed 2 3 times in a row. It can achieve the purpose of rapid core, early maturity and increased yield to increase the content of chlorophyll, protein and nucleic acid in Chinese cabbage.

Makes the leaves grow faster and wraps the core earlier.

In the ball-setting and hearting period, 100 grams of Chinese cabbage antiseptic hearting agent per mu is sprayed on 30 50 kg of water, which can increase the yield by 15%, and has a good control effect on Chinese cabbage soft rot, black heart disease, dry heartburn, etc.

Chinese cabbage coreing agent is mainly composed of nitrogen, phosphorus and potassium fertilizer and zinc-molybdenum-boron element micro-fertilizer and hormones, it is used for Chinese cabbage rosette stage and early root spraying, can speed up its growth rate, increase its compactness, thereby improving the yield of Chinese cabbage, in addition to can also be used for other stems, leaves of vegetables in the late stage of spraying, spraying within a week after obvious effect, can make vegetable stems and leaves strong leaf fertilizer.

Chinese cabbage coreing agent is mainly composed of nitrogen, phosphorus and potassium fertilizer and zinc-molybdenum-boron element micro-fertilizer and hormones, it is used for Chinese cabbage rosette stage and early root spraying, can speed up its growth rate, increase its compactness, thereby improving the yield of Chinese cabbage, in addition to can also be used for other stems, leaves of vegetables in the late stage of spraying, spraying within a week after obvious effect, can make vegetable stems and leaves strong leaf fertilizer.

Answer: The whole growth period of Chinese cabbage can be divided into seedling stage, rosette stage, balling stage and harvest stage. After the autumn sowing of Chinese cabbage enters the balling period, due to the decrease in external temperature, the growth of external leaves slows down, the leaves gradually age, and the growth of heart leaves accelerates. Therefore, after Chinese cabbage enters the balling stage, it needs to absorb a large amount of nutrients and water to meet the growth of leaves.

The demand for water and fertilizer is the greatest.

The reason why Chinese cabbage is not hearty.

1) Insufficient water and fertilizer: insufficient water and fertilizer is the main reason why Chinese cabbage is not heartfelt. After Chinese cabbage enters the bulboding stage, the leaf growth is the largest, and it needs to absorb a lot of water and nutrients to meet the growth of the leaves.

If the soil is dry at the balling stage and there is no topdressing in time, it will cause insufficient water and fertilizer, the growth of stems and leaves is small, and the core is very small, or even not hearted.

2) Variety reasons: the planting time of late-maturing varieties is too late, the growth period is not enough, the leaves are too small and too few, and the plant will appear to be not tight or not wrapped.

3) Excessive humidity: once the planting density is too large, once the heavy rainfall and rainy weather are encountered, the leaves block each other, the field is waterlogged for a long time, and the humidity is too large, resulting in the growth of the outer leaves is too vigorous, and the inner heart leaves stop growing or grow slowly.

Article **3 Solution.

1) For plots with arid soil and insufficient water and fertilizer, it is necessary to water in time, and combined with watering, 15 to 20 kg of urea per mu should be applied with water. Ensure the water and fertilizer needs of Chinese cabbage.

2) artificial bunched leaves: Chinese cabbage bunched leaves, also known as bundling vegetables or tied vegetables, it is in the middle and late stages of Chinese cabbage balling, before the arrival of the initial frost period, the outer leaves of Chinese cabbage are picked up with straw or string, and they are tied to the leaf balls 2 3 measures. For farmers with a small planting area, the method of bunching leaves can be adopted to bundle the outer leaves of Chinese cabbage, which can promote the core wrapping and improve the quality of Chinese cabbage.

2) Spraying core-wrapping agent: After the Chinese cabbage enters the heart-wrapping stage, 6 10 grams of 8% amine fresh ester soluble powder + 80 100 grams of 99% potassium dihydrogen phosphate + 50 100 grams of urea can be sprayed evenly with 20 30 kg of water. Spray every 7 10 days, 2 sprays in a row, 3 times.

It can not only quickly replenish foliar nutrients, but also promote the rapid growth of leaves. Promote Chinese cabbage wrapping. Improve the yield and quality of Chinese cabbage.

I'm going to buy some cabbage wrapping agent.

It is best to spray cabbage when small insects occur, and do not wait for the harm to be serious.

According to the pattern of the disease, it can be prevented in advance. When pests and diseases have just appeared, it is best. Whether it is a plant or an insect or a germ20 30 , especially 25 , is the most suitable temperature for its activity.

At this time, spraying pesticides will be more effective against the active stage of Cordyceps and more safe for crops.

Whether it is sowing Chinese cabbage in spring or sowing Chinese cabbage in autumn, it is necessary to determine the most ideal cultivation season suitable for sowing according to the temperature characteristics of Chinese cabbage seed germination and seedling growth. The main growth period of Chinese cabbage is arranged in the most suitable season for the growth of Chinese cabbage, and try to avoid the harm of bad weather factors such as high temperature or low temperature to Chinese cabbage.

Precautions for cabbage planting:

1. If it is a large area of autumn cabbage, sowing at the right time, the yield and quality are the best. However, in some areas, there was a drought that year, and there were serious pests and diseases, so they were only sown late.

2. There is also a risk of sowing cabbage too late, and the advantage of sowing late is that it is out of the bush, the temperature is reduced, which is conducive to the growth of seedlings, and the probability of pests and diseases is less. However, the shortcomings are also obvious, the temperature of Chinese cabbage drops during the balling stage, the core is not compact, and the yield and quality decrease.

There are pests and diseases when spraying, if you can fight less, you will not fight more.

When to apply the medicine, it has to be decided according to the growth of the cabbage, and it is impossible to apply the medicine for no reason.

Top dressing at seedling stage. Seedlings are mainly used to extract seedling fertilizer. From cotyledons to true leaves to 8-10 leaves, about 15-20 days for the seedling stage, after the seedling is set 5 kg of urea per mu.

Top dressing at rosette stage. After the Chinese cabbage enters the rosette stage, the root system occurs in large quantities, grows fast, and requires a large amount of fertilizer, the rosette period is generally 20-25 days, 10 kg of urea per mu, and a certain amount of phosphorus and potassium fertilizer is applied to promote the growth of outer leaves and lay a good foundation for the heart.

Top dressing during the heart period. The heart-hugging period accounts for 1 2 time of the growth period, and the growth accounts for 2 3, at this time, 10 kg of urea per mu is generally chased. In the later stage of the heart, due to the short light and low temperature, the plant grows slowly, absorbs less nutrients, and the effect of topdressing is not obvious, so it can be less or no topdressing.

Extended information: 1. Cabbage.

Cabbage (scientific name: brassica pekinensis rupr.).), Brassica of the cruciferous family, known as the "king of vegetables".

Cabbage is native to northern China, cultivated in the north and south, and was introduced to Japan, Europe and the United States in the 19th century. Multiple leaves are tightly wrapped together to form a cylinder, and most of them form a dense head, and the leaves that are wrapped inside are pale green to pale yellow because they do not see sunlight.

2. Geographical distribution.

Cabbage is native to the Mediterranean coast and China. The south of the Yangtze River is the main production area, and the planting area accounts for 40%-60% of the sown area of autumn, winter and spring vegetables. After the 70s of the 20th century, the cultivation area in northern China also expanded rapidly, and it was widely cultivated in various places.

Its cultivation area and consumption rank first among all kinds of vegetables in China.

3. The benefits of cabbage.

Cabbage helps to moisten the intestines and laxative.

Eating cabbage often can help people to have a laxative effect, mainly because cabbage contains water and rich dietary fiber, these substances are very good for the body, it can help intestinal peristalsis and replenish water, eating cabbage often can help the human body absorb and digest, promote excretion, it can also prevent constipation and maintain intestinal health.

Cabbage helps in beauty and skin care.

Many people should not know that cabbage can help people beautify, in cabbage contains water, vitamin C and vitamin E, often eating cabbage can help replenish the loss of water, the vitamins in cabbage can also prevent pigmentation, beauty and beauty, often eat cabbage can improve the immunity of the first and reduce the damage of the cold wind.

Cabbage helps to nourish the stomach.

Cabbage is a very nutritious vegetable, it can help people protect the stomach, mainly cabbage is rich in vitamin U, this substance is also known as methyl sulfide amino acids, methyl sulfide amino acids chloride this substance is better for the body, it is an anti-ulcer agent, to the body can be ** gastric ulcer and duodenal ulcer.

To grow Chinese cabbage, urea is best used in three time periods, one is the seedling stage, the second is the rosette stage, and the third is the balling stage. It is best to give urea to Chinese cabbage during these three periods.

Be sure to use urea in the appropriate proportion, so that the Chinese cabbage can grow better. When the Chinese cabbage is first planted, when the Chinese cabbage grows to a month, and when the Chinese cabbage is about to be harvested, it is very good to use urea at these times.

Urea should be used in the early, middle, and late stages of growing Chinese cabbage. As a basal fertilizer before planting, a large amount of urea should be supplemented at the rosette stage and bulbous stage, because the root system needs to grow rapidly from this time onwards to provide nutrients to the leaves.

The main reasons are as follows:1Variety.

2.Improper fertilization: Because of the high temperature in summer, many growers blindly apply fast-acting nitrogen fertilizer in order to promote the rapid growth of Chinese cabbage, and do not pay attention to the application of phosphorus and potassium micro-fertilizer, resulting in excessive nitrogen fertilizer and insufficient phosphorus and potassium micro-fertilizer, so that Chinese cabbage is not wrapped or the core is loose and not compact.

3. Uneven water supply: Because of the high temperature in summer, cabbage grows rapidly and requires more water.

4.Rainy and humid: In summer, because of frequent rainfall, the humidity in the Chinese cabbage field continues to increase, and the growth of Chinese cabbage is also easy to produce unwrapping.

5. Improper control of pests and diseases: the occurrence of pests and diseases of Chinese cabbage in summer is more serious, especially soft rot, dry heart disease, downy mildew, powdery mildew, virus disease, aphids, cabbage insects, etc., the occurrence of these pests and diseases affects the growth of Chinese cabbage vegetative body to a certain extent, which can cause the production of Chinese cabbage without heart.

Response. 1. Choose excellent varieties.

2.Reasonable fertilization: In the bulboding period of Chinese cabbage, it is necessary to pay attention to increasing the application of phosphorus and potassium micro-fertilizer and organic fertilizer to control nitrogen fertilizer.

to curb its wild growth. Usually in the early stage and middle stage of balling, 1-2 times of Carmene potassium should be applied, 10-15 kg per mu each time, and washed with watering.

3. Scientific watering: In the Chinese cabbage wrapping pilling period, it is necessary to maintain uniform and sufficient supply of water, avoid more and less, dry and wet, in order to maintain the soil moist is appropriate, you can water 1 time in the morning and evening, remember not to water at noon, at the same time, you should also cover the furrow with weeds, and the grass thickness is 3-5 cm to reduce water loss, maintain soil moisture, and maintain uniform moisture.

4. Pay attention to timely prevention and control of diseases and insects: During the period of Chinese cabbage balling, it is necessary to pay attention to frequent inspection of leaves, and timely prevention and control when downy mildew, soft rot and other diseases are found.

5. Timely spraying of foliar fertilizer to enhance the core: In the Chinese cabbage heart bulb stage, every 7-10 days can be foliar spray 800 times of liquid Jiamei vegetable gold, spray 2-3 times, evenly spray wet leaves, can effectively enhance the cabbage core. Today, I recommend a product from Demer Crop Nutrition Company in Germany - a special foliar fertilizer for cabbage, which can promote photosynthesis of cabbage and alleviate common diseases such as a hundred times of vitamin deficiency.