In winter, the leeks of the small arch shed are not covered with grass and toasts

This depends on the local temperature, if the temperature is high in winter, it is not used, if the temperature is too low (such as below zero), you need to cover it.

In addition, the underground part of the leeks is generally safe to overwinter, if you don't want to harvest the leeks in the winter then it doesn't matter if you don't cover it, but if you still want to harvest, you need to do a good job of heat preservation measures.

The key is to look at the temperature in the shed, the temperature is low to cover, the temperature is high (in addition, it is generally removed when there is sunlight during the day, and then covered when the temperature begins to cool down in the afternoon and evening.)

We don't need to cover the grass curtain for the small arch shed leeks here in winter, even if you cover the grass curtain, he can't grow because the temperature is too low. When leeks germinate in spring, you can cover the grass curtain, and the leeks grow quickly during the day to prevent frostbite at night, and the grass curtain can be covered.

It will be very bad to keep the grass and keep the grass warm, and the leeks will grow very slowly, and they will be hurt in extreme cold weather. It's not coverable.

It's better to cover it, the northern weather says it's cold. It's okay if it's not too cold, but if it's too cold, you'll freeze to death.

You can leave it uncovered, but it can't reach the temperature of rapid growth, and it grows slowly!

How to build a small arch shed for leeks in winter is as follows:

1. The bamboo arch is inserted into the inner side of the 2m wide ridge with both ends of the bamboo piece with a width of 3cm and a length of 3m, and the spacing between the bamboo pieces is 80cm, and the arch rod is longitudinally connected with three thin bamboo poles to enhance stability. One in the middle of the three longitudinal tie rods, one each 10cm from the ground.

2. The lower end of the thin bamboo pole or cotton locust strip arch is inserted into the inner side of the 2m wide furrow, the upper end is entangled, and the rope is tied firmly, and the three longitudinal rods are the same as the bamboo arch. Each arch is supported by a column at the bottom of the frame.

3. The steel arch is bent into an arch with a steel bar that is 2m wide and 1m high, and every 80cm - road, both ends are inserted into the soil.

4. Cover plastic film: Generally, the small arch shed is covered with a large trembling potato chunk film. Buried in the soil all around, this method of covering is both a waste of film and labor-intensive, and it is also convenient to ventilate.

Leeks

Leek, alias: abundant book, grass stalactite, yang grass, lazy cabbage, long-lived leek, aphrodisiac grass, flat cabbage, etc.; It is a perennial herbaceous plant of the lily family with a special strong odor.

rhizomes recumbent, bulbs narrowly conical, clustered; Scale-brown skin, reticulated fibrous in slanted entrums; The leaves are weak, strip-shaped, flattened; Umbel inflorescence, apical. Leaves, flowers and flowers are eaten as vegetables;Leeks are adaptable, cold and heat tolerant, and are cultivated everywhere throughout the country.

Summary. Reason: What is the reason for the slow growth and uneven germination of leeks?1. The growth of rhizome dormant leeks stops according to the rhizome dormant habit of leeks, if the stems and leaves on the ground do not dry up or do not completely dry up in winter, that is, they have not yet passed the dormant period when the shed is warmed up, and the leeks can often germinate, but when they grow to 10 cm, they stop growing, and then the leaf tips droop, and then rot.

When this happens, the only way is to uncover the film so that it continues to feel the low temperature, complete dormancy, and then buckle the shed for production. Second, the false stem and the whole dormant leek grows slowly, according to the false stem and the whole plant dormant habit of the leek, in the timely buckle shed growth for a period of time, it will become slow to grow, this situation mostly occurs in the greenhouse with poor temperature performance, or encounters low temperature and cloudy days, the low temperature of the shed makes the leek forced into dormancy. Solution:

The first is to leave the carpet blanket at night, create low temperature conditions to pass the dormancy period (about 10 days), and then heat up to continue to grow. The second is to spray or irrigate the plants with 30 mg of gibberellin per kilogram, followed by watering. 3. The dormancy habits of the dormant varieties with false stems used for untidy germination of leeks have been alienated.

**Jiaxing white root leeks in Jiaxing and other places, when the production of the shed is as scheduled, it encounters low temperature or even cloudy weather. Leeks have been found to be untidy when there is no way at the moment.

After the small arch shed leeks are buckled into the shed, what should I do if the seedlings are not complete.

In this case, you can only increase water and fertilizer management in weak areas.

Reason: What is the reason for the slow growth and uneven germination of leeks?1. The growth of rhizome dormant leeks stops according to the rhizome dormant habit of leeks, if the stems and leaves on the ground do not dry up or do not completely dry up in winter, that is, they have not yet passed the dormant period when the shed is warmed up, and the leeks can often germinate, but when they grow to 10 cm, they stop growing, and then the leaf tips droop, and then rot. When this happens, the only way is to uncover the shed film, let it continue to feel the low temperature, complete the dormancy, and then buckle the shed to produce rubber or not.

Second, the false stem and the whole dormant leek grows slowly, according to the false stem and the whole plant dormant habit of the leek, in the timely buckle of the shed growth beam for a period of time, it will become slow growth, this situation mostly occurs in the greenhouse with poor temperature performance, or encounters this fierce low temperature even cloudy day, the low temperature of the shed makes the leek forced into dormancy. Treatment method: First, do not cover the grass felt at night, create low temperature conditions to make it survive the dormancy period (about 10 days), and then heat up to continue to grow.

The second is to spray or irrigate the plants with 30 mg of gibberellin per kilogram, followed by watering. 3. The dormancy habits of the dormant varieties with false stems used for untidy germination of leeks have been alienated. **Jiaxing white root leeks in Jiaxing and other places, when the production of the shed is as scheduled, it encounters low temperature or even cloudy weather.

Leeks have been found to be untidy when there is no way at the moment.

Shangxinkou Town, Xiqing District, Tianjin City, and Yangfengang Town, Bazhou City, Hebei Province carry out the production of leek small arch sheds, which are generally planted for about 4 years of continuous production, and then updated and eliminated. The planting method is a single plant planting with a wide ridge spacing of 15 cm, a ridge width of 15 cm, a row spacing of 5 cm in the ridge, and a plant spacing of 5 cm, 2 per 667 m2

About 150,000 seedlings were planted. The timing of sowing and planting varies depending on whether or not the year's production is planned. The traditional practice is not to buckle the shed production in the winter of that year, the sowing time is mostly arranged at the end of March and the beginning of April, open field sowing, planting in early and mid-August, because the yield is not high, generally do not buckle the shed production, and wait until the second year of the output to go up and then buckle the shed.

In recent years, in order to obtain benefits as soon as possible, many farmers use protected land in the spring to sow seedlings in advance, and plant around mid-May, after long-term bacon maintenance in summer and autumn, in winter, the leek roots have been relatively strong, and the tillering has also increased significantly, and the lower yield can be obtained by buckling the shed that year, so that the land use efficiency will be greatly improved. The main varieties selected are the non-dormant type of Jinyu No. 8 and the dormant type of improved Hanzhong. Jinleek No. 8 in late October buckle shed and cover straw, about 35 days after the shed harvest the first knife, New Year's Day harvest the second knife, around the Spring Festival harvest the third knife.

If the production is planned to continue the following year, after the third cut, it will no longer be harvested and will be transferred to root raising. If the leek root is old and needs to be eliminated, the fourth knife is generally harvested, and then the root is eliminated, and other vegetables are planted by using small arch sheds. Improved Hanzhong is generally in late November buckle shed and cover the straw, harvest the first knife before New Year's Day, harvest the second knife before and after the Spring Festival, and harvest the third knife after more than 20 days.

The area of Dasang Town, Huimin County, Shandong Province is generally sown after the soil thaws in spring, planted in May and June, and the canopy is covered with grass in that year, and the varieties used are mainly non-dormant type Jin Leek No. 8 and Improvement 791.

Yongnian County, Hebei Province mostly uses small arch sheds for early cultivation of leeks in spring. The varieties selected are generally dormant Hanzhong, purple root leek, etc. Management before and during overwintering is the same as for open-field leeks, but it is necessary to make holes in the arch before the ground freezes.

In the early spring of the second year, the scaffolding is mostly supported and buckled around the beginning of spring. After the ground is thawed, the roots are dried and the leeks are killed by pouring medicine. Harvest the first knife 1 month after buckling the shed, and harvest the second knife in about 25 days.

After the severe winter, the film and skeleton are removed and transferred to open field production. In spring and summer, harvest 2 or 3 knives, and do a good job of root raising in autumn, so as to lay a good foundation for continued shed production in the next year.

The management of the winter shed of leeks is as follows:

Scientific regulation. Timely spraying of ecological regulator vegetables to strengthen the stems and stems of the trembling plants can promote the trembling plants with thick stems, thick leaves, fresh and tender leaf colors, lush plants, and strong natural taste. At the same time, it can improve the ability to resist disasters, reduce the amount of pesticides and fertilizers, and reduce residual toxicity.

Disease prevention and fertilization. After each harvest, the new high-fat film is sprayed 600 times the night, which can automatically form a layer of polymer protective film invisible to the naked eye, and optimize the quality of water absorption, ventilation and light transmission of plants. Shielding the signal of pest and disease and weakening the transmission vector, resisting and defending against natural environmental disasters.

When the seedlings grow to 5 10 cm, urea is applied once, and with the spraying of photosynthetic nutrient film fertilizer, it can help plant eggplant imitation to absorb a large amount of light fertilizer, light energy, light, compatible with conventional fertilizer, and nutrients to supply plant growth and development to the limit, and benefit from one application throughout the year.

The use of plastic small arch shed buckle leek, in the direct seeding and transplanting roots, should be made into 2 meters wide (1 meter wide furrow two furrows can also be 10 meters long, the leek roots are cultivated in the ditch, and the empty furrow is cultivated eggplant or melon vegetables, so as to facilitate the buckle shed, and can also be used continuously.

The seedling and root raising technology of leeks in protected areas is described above. There are two main ways to produce leeks in small arch sheds: early production in spring and delayed production in autumn.

1) Early production in spring Insert the arch before freezing in early winter, and dig a trench around the arch in order to fix the shed film. Dig a wind barrier trench every 15 20 metres in the leek field to allow for wind barriers to be installed in the spring.

Generally, in North China in early February, Northeast China in mid to late February, choose a windless and sunny day to cover the plastic film on the skeleton, and bury the soil in the ditch around it for compaction. When the topsoil layer in the shed thaws 10 cm, choose a windless and sunny day to uncover the film, eradicate the dead leaves, cultivate and hoe, and then cover the film to close the shed for insulation, and finally cover the grass at night.

When the leeks grow to more than 10 cm, top dressing, 500 600 grams of ammonium sulfate per shed, can be flushed with the water, watering can be selected at noon on a sunny day for short-term ventilation and humidity, to prevent the humidity in the shed from causing leek disease. When the leeks grow to more than 20 cm, they can be harvested and marketed with the first knife.

After the first leek is harvested, the external temperature gradually rises, and the air should be released so that the temperature in the shed is not higher than 30. The wind is generally carried out by uncovering the canopy film at both ends of the small arch shed, and the morning and evening and length of the wind release time should be determined according to the weather conditions. When the second knife leek grows to 5 cm, the second top dressing should be carried out, you can choose to open the shed film at noon on a sunny day, apply 600 grams of ammonium sulfate per furrow, and then water the shed.

With the increase of external temperature, the growth of plants accelerates, and the frequency of watering should be increased to maintain soil moisture. After the second leek is harvested, it is sprinkled in the arch shed and turned to the fruit and vegetable furrow.

2) Autumn delayed production The autumn delayed production of small arched leeks is a cultivation method in which the leeks are covered with plastic film arch sheds and grass before they are not frost damaged in early winter, so that the leeks can prolong the growth period and harvest more than the open field. In North China, it generally begins to cover around the early frost in late October, and before the severe frost arrives.

In order to improve the growth quality of leeks, harvest them once in the open field about 15 days before the small arch canopy covering, top dressing and watering when the new leeks have grown 3 5 cm, and then cover with film and grass toma. If the open field is harvested too late or the canopy is covered too late, the leeks will enter forced dormancy due to low temperature, and the purpose of delayed cultivation cannot be achieved.

In the early stage of buckle shed, because the external temperature is not too low, the film at both ends of the small arch shed should be uncovered at noon on a sunny day to ventilate. In the future, as the external temperature drops, the cold protection and heat preservation should be strengthened, and the temperature in the furrow should be kept at about 20 during the day and about 10 at night. The first stubble of leeks can be harvested after 30 to 40 days.

Autumn delayed small arch leek is usually harvested with only one knife and the mulch is removed, so that it stops growing.

The characteristics of fertilizer technology are to increase the proportion of fertilization in autumn, carry out "root raising and promote seedlings", reduce the amount of fertilizer in the shed, and effectively avoid the harm of harmful gases in the shed and improve the yield.

For every 1000kg of yield, it is recommended to use 35kg of leek formula fertilizer (17-14-14) throughout the year, which is used in four periods.

Spring application of basal fertilizer (8%): about 15 days after the spring cut, hoe in time, evenly sprinkle 5000kg of humus miscellaneous fertilizer on the furrow surface, or 1000kg of bio-organic fertilizer, and properly control the moisture. Apply formula fertilizer in early to mid-May, and apply it with water.

Beginning of autumn fertilizer (23%): In early August, it is carried out around the "beginning of autumn", and it is applied with water.

Autumn top dressing (35%): from late August to late September, it is applied three times with water.

Buckle shed fertilizer (22%): before buckle shed, ditch application or flush with water. Light dormant varieties can be buckled after November 15, and deep dormant varieties can be buckled after December 1 and fully dormant.

If the shed is buckled too early, physiological disorders such as "dry tip" and slow growth are prone to occur.

Top dressing at harvest time (12%): the second knife leek is carried out during or after harvesting, and is applied with water.