How to grow leeks in greenhouses in winter? How to control the temperature in the shed?

Heat preservation. After the shed is sealed, keep it 20-25 during the day and 5-10 at night. When the plant height grows to more than 10 cm, keep it at 16-20 during the day, and let the wind and humidity in the shed exceed 24.

When cultivating leeks in a small arch shed in winter, it is necessary to strengthen heat preservation, keep the temperature above 6 at night, and then as the temperature drops, do a good job of covering grass and paper quilts at night, and uncover them in the morning and evening to strengthen the thermal insulation performance.

When planting leeks in greenhouses, the planting place of leeks should be rich in sandy soil rich in organic matter, in terms of temperature, after the greenhouse is sealed, keep 20-25 degrees during the day and 5-10 degrees at night. When the plant height is more than 10 cm, it is maintained at 16-20 degrees during the day. When the temperature of the greenhouse exceeds 24 degrees, it is necessary to let the wind reduce humidity and keep it above 6 degrees at night.

During the growth of leeks, light is also very important, and there should be no shade in the shed.

1.Temperature management The initial temperature of the buckle shed should not be too much, it should be gradually increased, and the ground temperature can be increased by cultivating * to increase the height of the false stem, and the temperature should be controlled between 18-26 degrees during the day and between 8-10 degrees at night, not less than 5 degrees. 2.

Humidity management Timely ventilation is an important measure to regulate the indoor temperature and humidity of the shed, eliminate harmful gases, and promote the growth of leeks 3Fertilizer and water management Fertilizer and water are the material basis for the growth of leeks, and it is generally necessary to gather frozen water for fertilization before buckling the shed.

The biggest difference between the technical measures of root cultivation of leeks in autumn and winter and the technical measures of greenhouse cultivation after dormancy is that manure is often used to promote the rapid growth of leeks, accumulate more nutrients, and cultivate stout root plants. Therefore, do not harvest in summer and autumn, pay attention to cultivating and weeding, and pay attention to ridge formation and drainage in the rainy and waterlogged seasons. Before the start of autumn, growth should be properly controlled to prevent lodging and rotting.

Once autumn begins, water and fertilizer will be strengthened to boost growth. In general, top dressing will be carried out 2-3 times, with 2000 kg of human manure or 50 kg of diammonium phosphate or 30 - 40 kg of ammonium sulfate plus 50 - 100 kg of superphosphate per mu.

The appropriate period of buckle film should be before the first frost in the local area. If it is early, it grows rapidly, the yield peak comes early, and it is easy to premature aging; If the buckle is late, it will suffer from low temperature and cold injury in the open field, which is easy to cause leaf tip rot, and once the leeks turn into passive dormancy, the growth will be slow after the film is buckled.

Management and harvesting after the buckle is fixed. Generally speaking, shallow cutting can be made before buckling the film, and the film can be buckled immediately after harvesting, which is easy to operate. If the leeks have not yet reached harvest standards, a film should be fastened to prevent frost damage, but care must be taken to prevent damage to the leek plant.

During the initial phase of membrane buckling, the indoor temperature is relatively high, so ventilation must be strengthened to prevent overgrowth. In general, the temperature during the day should not exceed 25 . As the outside temperature decreases, the amount of exhaust air gradually decreases, maintaining at 20 25 during the day and 5 10 at night.

In the future, when the outside temperature drops, straw and paper covers will be covered at night, and in order to improve thermal insulation, these covers will be removed early and late.

In autumn and winter, the production of leeks still needs to be topdressed and watered after the film is buckled. Generally, when the plant height is about 10 cm, 40 50 kg of ammonium sulfate per mu is applied between the rows, the ridge is watered, and when the plant height is 20 cm, the ridge is cultivated again. Watering 2-3 days before harvesting.

After each water, it is necessary to strengthen the ventilation and moisture discharge, but care should be taken to prevent frost damage. For leeks produced in autumn and winter, the harvest period can be extended from October to February-March of the following year if they grow vigorously. After harvesting, the roots of the leeks are removed, and fruits and vegetables are produced.

Attention should be paid to shallow cutting at each harvest so as not to affect the growth of the next crop. However, in the last harvest, the leek root can be cut as deep as possible after cutting.

Strengthen pest and disease control. Due to the frequent watering in the greenhouse and the high humidity, attention should be paid to the prevention and control of gray mold: it can be prevented by smoking the greenhouse with Sukrin smoke agent after each watering.

Disease: In the early stage of the disease, it is sprayed with 58% methyl manganese zinc 500 times or 64% alum 400 500 times liquid. Leek maggots can be treated with 90% trichlorfon 1000 times or phosphine 800 times.

Winter greenhouse planting leeks: cover the shed film, when building the scaffolding, the outer layer of the greenhouse and the inner layer of the arch shed spacing should be kept at 15 20cm, three layers of film (including the innermost layer of small arch mulch) is best not to use new polyethylene plastic at the same time, to use the old and new together. The outer layer should be made of vinyl acetate non-drip film or polyethylene dust-proof non-drip composite film.

Planting leeks in winter greenhouses: variety selection, planting leeks in winter greenhouses should be selected from excellent varieties that can grow continuously without dormancy.

Growing leeks in winter greenhouses: cultivation techniques, cultivating strong roots is the basis for high yield and high efficiency. The biggest difference between the technical measures for producing leeks in winter and the leeks in the greenhouse after dormancy is that the manure is large and the water is diligent, which promotes its rapid growth, accumulates more nutrients, and cultivates strong roots.

Selection of leek plotThe site of the greenhouse leek should be selected with convenient transportation, good irrigation conditions, and sandy loam rich in organic matter.

Planting leeks in winter greenhouses: pest control, due to frequent watering in the greenhouse, high humidity, attention should be paid to the prevention and control of gray mold, and it can be prevented by using Sukelin smoke after each watering; It is necessary to remove the sick and disabled bodies in a timely manner. Peel off the diseased leaves at each harvest and bury them deeply.

Leeks can be grown all year round, and there are two ways to grow leeks, sexual reproduction and genetic variation. Sexual reproduction is actually to sprinkle the seeds in rows in the field to pre-seedling. However, this kind of planting method is not well advocated, the seeds of leeks are too fine, and the rhizomes of leeks are relatively developed and the reproduction rate is stronger, so in the case of seed seedlings, if the planting is too concentrated.

The leek seedlings before germination are thin and weak. Leeks only need to be planted for one year, and they can be harvested in the next 4-5 years, that is, because of these characteristics of leeks, they are commonly planted by the villagers.

Leeks have the characteristics of jumping roots, therefore, the soil cultivation work can not be ignored, should be melted and bleft Xinhe compound fertilizer to carry out a large soil cultivation to promote growth, usually can have the opportunity to carry out small soil, soil cultivation should be carried out on sunny days, with the road surface has eroded subsoil cultivated at the roots of the plant. During the growth period of leeks, the climate is soft and precipitation is too much, and weeds are easy to produce, so it is necessary to hoe and hoe the soil and loosen the subsoil, and raise the soil temperature, so as to facilitate the leeks to raise their roots and grow trees, and often cut off the yellowish and dead branches to reduce the occurrence of diseases.

Leeks are not the same growth period for the temperature regulations, the germination period is the seed germination to the seedling extension and emerge the first leaf, the minimum temperature of seed germination is 2 3, the suitable temperature is 15 18, the number of germination days is determined by the soil temperature, generally about 10 20 days; The seedling stage is the time constant of the first leaf outstretching, about 40 60 days, and the growth temperature is 12 24 , and the growth above 25 is not good. The suitable temperature for the growth of leaves and stems is 12 24 in broad daylight, and the temperature regulation is relatively high during the flowering period of sprouting, generally 20 26.

Leek varieties are different, low temperature resistance is also different, leeks native to the southern region, like warm climatic conditions, low temperature resistance is weak, varieties produced in the northern region, low temperature resistance is very strong. There are many varieties from the southern region that cannot be cultivated in the open field for the winter in the northern region, so attention should be paid to the selection of varieties. Under the premise of open field cultivation, or in the spring plastic arch shed where the temperature is low and the temperature is low, the temperature is within 35 in the afternoon during the daytime, and the temperature drops to 2 at night, the plant can still grow normally.

However, when planting in the greenhouse for winter, it will produce chilling injury, mainly because of the weak sunlight in the greenhouse, high humidity, delicate leaf mechanism, and low cold resistance.

When planting leeks, it is necessary to disinfect the soil in advance, and to ensure that the soil is clean and tidy, the acid-alkali locust of the soil can be sown. When planting lead and planting leeks, the temperature should be controlled at least above 12 and kept at about 15 18.

It is necessary to grasp the timing of planting. Keep the temperature at around 20 degrees and water in time to ensure the moisture of the soil.

Choose the right land for planting, pay attention to watering, pay attention to fertilization, pay attention to light, and generally it is best to keep it at about 20 is the most suitable.

To choose the right variety for planting, we must pay attention to the density of planting when planting, we need to pay attention to watering, we need to pay attention to the temperature of the acre, and the thermometer is 15 left and orange right.

Leeks are a vegetable with strong adaptability, many farmers use greenhouse facilities to produce leeks, the consumption of the market shows an upward trend and the market is high, and the economic benefits are very good. So, what do you need to pay attention to when growing leeks in a greenhouse? <>

First of all, it is necessary to pay attention to soil selection and sowing seedlings. The soil for planting leeks should be fertile, flat, with good water and fertilizer retention capacity, convenient drainage and irrigation, and it is best to use sandy soil. When choosing varieties of leeks, it is necessary to choose varieties with good cold tolerance, good quality and high yield.

The best time to sow in spring is in early April, and the best time to sow in autumn is in mid to late September. Before planting, the seeds should be soaked in warm water for about 10 hours, and then soaked in cold water for about two days, then drained, wrapped in a gauze bag, and placed at about 18 degrees for germination. It should be washed with water once a day, and after about two days, the seeds will begin to show white and can be sown.

After the seeds are treated, they can be sown, and there are two main sowing methods: strip sowing and scattering. Both have their own advantages and disadvantages, the advantage of strip sowing is that the growth is more crowded, but it is easy to manage, and the advantage of sowing is that the growth is good, the emergence of seedlings is uniform, but the yield is low. When the leeks have 5 leaves and the height reaches about 10 cm, you can carry out the appropriate amount of watering, and when they grow to about 12 cm, you can carry out top dressing.

In addition to water and fertilizer management, manual weeding is also carried out. <>

Secondly, we should pay attention to the pest control, harvesting and stubble retention of leeks. Common pests and diseases of leeks include gray mold, blight, allium aphid, and leek late-eyed mushroom. The disease of leeks mostly occurs in summer, especially in high temperature and rainy weather, you can spray leeks with some insecticides.

The first crop grows slowly, about 50 days, the second crop takes about a month, and the third crop takes about 20 days. After the Spring Festival is finished, the soil should be retained, do not water, and pay attention to heat preservation and antifreeze. <>

It is necessary to pay attention to the light transmittance of the film, and at the same time pay attention to the light problem, pay attention to the water and fertilizer management during planting, do a good job in planting management, prevent injuries in advance, and renovate the soil during planting management, so as to ensure the growth of leeks.

To plant leeks in greenhouses, it is necessary to pay attention to temperature management, choose appropriate fertilizers, choose high-quality varieties, regularly carry out insect repellent, and control the number of watering.

Be sure to pay attention to temperature, pay attention to water management, pay attention to soil renovation, pay attention to leeks and pests and diseases, be sure to water regularly, and pay attention to tidying up the planting of leeks.

1. Watering frozen water: As long as the frozen water is watered in time, it can ensure better wintering. It is important to take care of the watering time, not too early or too late.

The moisture will be absorbed too soon, and it will not play a role in providing protection from freezing. Late pouring is easy to produce frost damage, which not only can not prevent frost, but also aggravates frost damage. It should be watered in early December every year, and watered thoroughly and sufficiently.

2. Soil fertilization: Although leeks have entered the dormant stage in winter, they still need to be fertilized properly. 1,500 kg of human urine manure should be applied per acre, and soil cultivation should be carried out.

Soil protection protects its roots from freezing, and is usually done three times throughout the winter, just by piling up near the roots. In addition to this Qinglu Hong, it can also be covered with hay, which can also play an anti-freezing role.

If you want leeks to grow better, you should soak the seeds before planting, and pick out the shriveled ones if they are dry, so as to improve their germination rate. And to promote germination, soak it in water for two days, and then plant it after opening. It is best to choose planting in spring, according to 10 cm row spacing, 2 cm plant spacing, not too dense, otherwise it will also affect growth.

When it reaches a length of 10 centimeters, it can be harvested and eaten. In addition, it is important to fertilize properly after each harvest to promote better germination.

Hello, if you plant leeks in early spring, the temperature is still low, so you should do a good job in cultivating loose soil, water and fertilizer management, and pest and disease management, and then I will introduce it in detail.

1. Apply plantar fertilizer.

Leeks are not the same as other crops, they can grow for 5-6 years after planting, so they can not be like other crops before planting with foot fertilizer, in the spring of each year, you can choose long-lasting and long-lasting soybean cakes, sesame cakes, etc., and then add fully rotted agricultural fertilizer, evenly sprinkle the mixed bottom fertilizer in the ditch that has been opened in advance, and sprinkle the bottom fertilizer into the ditch, and the ditch is about 15 cm deep.

2. Cultivating loose soil.

After the annual leek is green, it is necessary to carry out cultivating and loosening the soil, preventing and controlling soil compaction, you can choose to improve the soil with Haihewei microbial agent, clean up the weeds on the ground, cooperate with the cultivated loose soil, and flatten the furrow surface, so that the base of the leek plant can better receive sunlight, which can not only improve the ground temperature, but also promote the rapid regreening of the leek plant and prevent the growth of weeds.

3. Remove roots and soil.

For leeks that are more than three years old, the management of root and soil cultivation should be carried out after the beginning of spring, the purpose is to remove the dead and weak tillers, and retain the healthy growth of leek tillers, and the soil cultivation is carried out before the germination of new roots of leeks, and the position of the bulb disc is slowly moving to the landmark after the leeks are harvested, so the leeks should be soiled in the spring of each year and after each harvest.

Fourth, pest control.

Every spring is the most serious period of leek field qu, so in April must do a good job of prevention and control, you can spray deltamethrin EC 2000 times per mu for spraying, or use 2% methylavermectin EC 500 ml diluted into 1000 times of liquid for root irrigation, which is very effective.

In general, spring, like autumn, is the most vigorous season for leeks to grow, so it is necessary to do a good job of spring management so that leeks can grow better.