Production method of high-quality allium fistulosum

Abstract

The invention provides a production method of high-quality five-color leek, which comprises the following specific steps: when the temperature in a greenhouse is-4 DEG C to 10 DEG C, the duration time exceeds 2 days, the external illumination intensity is higher than 10000 lx, and the daytime sunshine duration is 4-6 hours, leek leaves are purple; when the temperature in the greenhouse is-4 DEG C to 10 DEG C, the external illumination intensity is 3000-10000 lx, and the daytime illumination time is 4-6 hours, the leek leaves are red; when the temperature in the greenhouse is 10 DEG C or above, the external illumination intensity is higher than 12,000 lx and the daytime illumination time is not less than 4 h, leaves of the Chinese chives are green; when no illumination exists or the illumination intensity in the greenhouse is lower than 400 lx and the illumination time in the daytime is shorter than 2 h, leaves of the Chinese chives are yellow; the leaf sheath part of the leek is always in a sand covering state and is white; according to the method, watering, topdressing and pesticide applying are not needed in the process from greenhouse covering to harvesting of the allium fistulosum, the quality safety and ecological safety of the allium fistulosum are guaranteed, and the requirements of high-quality vegetables and the requirements of consumers for healthy diet are met.

Description

Technical Field

[0001] The invention belongs to the field of planting technology, and more specifically, particularly relates to a production method of high-quality five-color leek. Background Art

[0002] Leek is a perennial vegetable crop of the Amaryllis family. It is rich in vitamin C, vitamin B1, vitamin B2, niacin, carotene, carbohydrates and minerals. In addition, leeks are rich in cellulose, which has the effects of benefiting the liver and stomach, moistening the intestines and promoting bowel movements, and preventing cancer, and is deeply loved by people. However, in order to prevent the influence of leek maggots, the pesticide residue in leeks exceeds the standard. Therefore, it is urgent to produce high-quality leeks.

[0003] As a rare vegetable, the five-color leek in Shanhaiguan District is deeply loved by high-end consumers because each leek has five colors of white, yellow, red, purple and green. The colorful colors and delicious taste of high-quality five-color leeks, coupled with green and safe production, make the economic benefits of five-color leek production significant and have great development potential. However, there are still some problems in the production of five-color leeks. First, experience management leads to uneven color and unstable quality of five-color leeks, which restricts the development of industrialization; second, the technical difficulty is high, the area is declining, and the process is facing the risk of being lost.

[0004] Therefore, providing a stable high-quality five-color leek production method is a technical problem that needs to be solved urgently in the field. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a method for producing high-quality five-color leeks, which includes key technologies such as variety selection, temperature and light changes, sand cultivation and color drying to produce five-color leeks. Ultimately, one leek has five colors of white, yellow, red, purple and green, combining appearance and nutrition.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A method for producing high-quality five-color leek, in which the specific steps of drying the color during the arch shed planting process are as follows:

[0008] (1) When the indoor temperature is between -4℃ and 10℃ and lasts for more than 2 days, the external light intensity is higher than 10,000 lx, and the daytime sunshine time is 4-6 hours, the leek leaves will turn purple;

[0009] (2) When the indoor temperature is between -4°C and 10°C, the external light intensity is between 3000 and 10000 lx, and the daytime light duration is between 4 and 6 hours, the leek leaves will appear red;

[0010] (3) When the indoor temperature is above 10°C, the external light intensity is higher than 12,000 lx and the daytime light time is not less than 4 hours, the leaves of leek will appear green;

[0011] (4) When there is no light or the light intensity in the greenhouse is less than 400 lx, and the daytime light time is less than 2 hours, the leaves of leek will turn yellow;

[0012] (5) The leaf sheath of leek is always not exposed to light and appears white.

[0013] Preferably, the variety of leek is Hanzhong winter leek or sedge leek.

[0014] Preferably, the leek is cultivated by direct seeding or transplanting.

[0015] Preferably, the direct seeding is performed by row sowing, and the seeds are sown in early April to early May. Watering is performed before sowing to maintain soil moisture, and then furrows are opened for sowing at a row spacing of 30 cm, a furrow depth of 10 cm, and a seed rate of 3.5 kg / 667 m 2 , then cover the soil, level the ditch, and level the bed surface;

[0016] The transplanting is carried out using two-year-old leek roots, and a cluster planting method is adopted in March and April, with 7 to 8 leek roots forming a cluster and 15 to 20 plants in each cluster.

[0017] Preferably, the yellow color in step (4) is presented by sand cultivation, and the first sand cultivation begins when the leek grows to 3 cm, with a thickness of 1 cm. During the growth period, the sand cultivation is performed 2-3 times in total.

[0018] Preferably, the control of leek maggots in the greenhouse planting process is mainly prevention, through at least one of agricultural measures, physical control, biological control and chemical control.

[0019] Preferably, the agricultural measures include applying fully decomposed organic fertilizer, ensuring good drainage, timely weeding, reasonable density planting, and ensuring ventilation;

[0020] The physical control is to use an insect-proof net, cover the outside of the middle arch shed with a 40-50 mesh insect-proof net, and hang yellow and blue boards (40-50 pieces / 667m 2 ) etc. to kill adult chive maggots;

[0021] Alternatively, the sun-drying high-temperature film covering method can be used to control leek maggots. In summer, choose a sunny morning with strong sunlight, cover the leek production plot with a light blue drip-free film (0.10-0.12mm), keep the temperature inside the film at 50°C, and then remove the film after 4 hours. After the soil temperature drops, flood the soil with water;

[0022] The biological control method is to control leek maggots by parasitizing nematodes. When the leeks are covered with ridges, insect pathogenic nematodes are released at a rate of 200,000 to 300,000 heads / m2 ;

[0023] The chemical control is to use microbial agents to control leek maggots, with a dosage of 50g / 667m 2 After harvesting the leeks, spray on the roots of the leeks and the surface of the bed.

[0024] Preferably, the arch shed planting process includes post-harvest management, the steps are: after the leek is harvested, all the sand in the plot is cleared, and 60-100kg / 667m of nitrogen, phosphorus and potassium fertilizers are applied. 2 , water thoroughly, apply medicine to prevent and control leek maggots, and then manage normally.

[0025] Preferably, the light and temperature are adjusted by lifting the straw thatch and opening the seams to let in air.

[0026] Preferably, the arch shed is constructed with steel bars or bamboo and wood to form an arch shed frame, with a span of 5m, a height of 1.5m, and a length of 60-80m. Four steel bars are built in the east-west direction, and the north-south steel frames are spaced 90cm apart.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The present invention utilizes the traditional arch greenhouse planting technology, adopts physical measures such as sand cultivation, light avoidance, temperature change, etc. to produce, and finally one leek has five colors of white, yellow, red, purple and green, integrating appearance and nutrition; and, no watering, no topdressing, and no use of medicine are required during the process from the covering of the greenhouse to the harvesting of the five-color leek, thereby ensuring the quality safety and ecological safety of the five-color leek, meeting the requirements of high-quality vegetables and the needs of consumers for healthy diet; in addition, the control of temperature and light in the production process of the five-color leek provides a basis for factory production, and plays a certain role in promoting the development of the five-color leek industry. In future production, the light time and temperature can be artificially controlled to carry out factory production of the five-color leek. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0030] Figure 1 These are pictures of the appearance of leeks in Examples T1-T3. DETAILED DESCRIPTION

[0031] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0032] Example 1

[0033] Test location: Wulitai Village, Shanhaiguan District, Qinhuangdao City;

[0034] Specific methods:

[0035] (1) Land preparation and ridge making: In late March, water the planting plots thoroughly, then prepare the land and make ridges, and spread 4000-5000kg / 667m2 of decomposed organic fertilizer. 2 , nitrogen, phosphorus and potassium balanced fertilizer (17-17-17) 50kg / 667m 2 , plow and harrow the land, make flat ridges in a north-south direction, with a length of 4.6m and a width of 2m;

[0036] (2) Direct sowing: Start sowing in early April or early May. Water before sowing. When the soil moisture is moderate, dig furrows with a row spacing of 30 cm and a furrow depth of 10 cm. Use drill sowing and use a seed rate of 3.5 kg / 667 m 2 Then cover the soil and level the ditch, level the bed surface, carry out field management after the seedlings emerge, select leeks with strong plants and sufficient nutrients, and you can produce five-color leeks in the same year;

[0037] (3) Management during the seedling stage: After the leek seedlings emerge, strengthen fertilizer and water management, keep the leek dry and wet, water once a month, and spread 60kg / 667m of Sa Ke Fu fertilizer (17-17-17) 2 Management in summer and autumn: In summer, the weather is hot and rainy. Pay attention to drainage and waterlogging prevention, strengthen pest control, and focus on fertilizer and water management in autumn. Water once every 10 days and apply 30kg / 667m2 of Sa Ke Fu fertilizer (17-17-17) 2 , to facilitate the return of nutrients to the roots;

[0038] (4) Preparation before closing the shed:

[0039] Shed construction: Use steel bars or bamboo and wood to build a simple arch shed frame with a span of 5m, a height of 1.5m, and a length of 60m. Build 4 steel bars in the east-west direction, and the interval between the north-south steel frames (bamboo and wood frames) is 90cm;

[0040] Remove residual plants: Close to the ground, use special tools to remove the dry leaf sheaths and leaves on the aboveground part of the plants;

[0041] Watering and fertilization: Apply 100kg / 667m3 of Kefu fertilizer (17-17-17) before covering the greenhouse film. 2 , water thoroughly.

[0042] Sanding: After watering and topdressing, spread fine river sand evenly over the planting plot, with a sand layer thickness of 3cm;

[0043] (5) During heavy snow, cover the greenhouse with film and straw thatch. Remove the straw thatch at 7:30 a.m. every day, but do not remove the film. Cover the straw thatch at 3:30 p.m. to promote the growth of chives. Prevention is the main method for controlling chive maggots. Physical control is used. Insect-proof nets are used. A 40-mesh insect-proof net is covered on the outside of the middle arch greenhouse. Yellow and blue boards (40 pieces / 667m2) are hung inside the net. 2 -50 blocks / 667m 2 ) Sticky killing of adult chive maggots;

[0044] (6) Drying: 20 days after covering the greenhouse film, when the outside temperature is between -10℃ and 5℃, adjust the temperature in the greenhouse by lifting the straw thatch and opening the gaps to let in air for drying. Open the straw thatch at 7:30 am and open the greenhouse film at 9:00 am to open the gaps to let in air. On sunny days, the gaps are opened from small to large. When the temperature in the greenhouse exceeds 10℃, the gaps are opened to a maximum of 1.5m. On cloudy days, open a small gap in the greenhouse film to let in air to avoid excessive humidity in the greenhouse. At 2:30 pm, close the gaps to slowly return to the temperature, and start to put down the straw thatch at 3:30 pm. During the day, adjust the size of the gaps in time according to temperature and other weather changes. In case of snow, clear the snow on the straw thatch and greenhouse film in time. Open the straw thatch in the morning but do not open the gaps to let in air.

[0045] (7) Harvesting: Before the Spring Festival, when the leeks are 15 cm tall, the first harvest is carried out. Cut them flatly with a sickle close to the ground and tie them with rubber bands. After the harvest, spread the sand in the plot flat, repeat the sand covering and drying process, and then harvest the second crop after 25-35 days.

[0046] (8) Post-harvest management: In early March, after the leeks are harvested, all the sand in the plot should be cleared and 60 kg / 667 m3 of Sakufu fertilizer (17-17-17) should be applied. 2 , water thoroughly, apply medicine to prevent and control leek maggots, and then manage normally;

[0047] The relevant comparisons and conclusions are as follows:

[0048] 1. Variety screening: In the early stage, more than 10 varieties including Hanzhong winter leek, scallion leek, single root red, 791 leek, and Haijiu No. 1 were tested. The results showed that under the same management conditions, only Hanzhong winter leek and scallion leek can produce five colors, while other varieties such as single root red do not have five colors. Therefore, the production of five-color leek requires the selection of vigorous, pressure-resistant, lodging-resistant and deep-dormant leek varieties, such as Hanzhong winter leek and scallion leek varieties;

[0049] 2. Temperature and light management

[0050] In order to explore the effects of temperature, light and other factors on leek production, 9 small sheds of 1 square meter were built in the middle of the shed, and different covering treatments were carried out: T1 (small shed covered with plastic light-transmitting film), T2 (small shed covered with shade cloth) and T3 (control, no covering). The randomized block experiment design was repeated three times. The temperature, humidity and light intensity of the three areas were continuously recorded using the repetitive Internet of Things recorder GSP-8G, and the environmental factors in the leek planting process were analyzed. The results are shown in Tables 1-5, which verified the effects of temperature, light and other factors on five-color leek. The results are as follows Figure 1 As shown, the untreated T3 leek has five colors (white, yellow, green, red, and purple), the T1 leek leaves are green, and the T2 leek leaves are yellow;

[0051] Table 1 Lighting time record

[0052] index sunrise Sunset External sunshine duration Duration of sunshine in the greenhouse January 20, 2024 07:18:52 17:05:00 09:46:08 07:44:00 January 21, 2024 07:18:18 17:06:09 09:47:51 07:46:00 January 22, 2024 07:17:43 17:07:19 09:49:36 08:30:00 January 23, 2024 07:17:05 17:08:28 09:51:23 07:50:00 January 24, 2024 07:16:25 17:09:39 09:53:14 07:48:00 January 25, 2024 07:15:43 17:10:49 09:55:06 07:30:00 January 26, 2024 07:15:00 17:12:00 09:57:00 06:30:00 January 27, 2024 07:14:14 17:13:12 09:58:58 07:10:00 January 28, 2024 07:13:27 17:14:23 10:00:56 07:15:00 January 29, 2024 07:12:38 17:15:35 10:02:57 07:24:00 January 30, 2024 07:11:47 17:16:47 10:05:00 07:30:00 January 31, 2024 07:10:54 17:17:59 10:07:05 07:26:00 February 01, 2024 07:10:00 17:19:11 10:09:11 07:32:00 February 02, 2024 07:09:03 17:20:23 10:11:20 07:45:00 February 03, 2024 07:08:06 17:21:35 10:13:29 07:48:00 February 04, 2024 07:07:06 17:22:48 10:15:42 07:50:00 February 05, 2024 07:06:05 17:24:00 10:17:55 07:52:00

[0053] Table 2T1 Data records of light, temperature and humidity

[0054] index Sunshine intensity (average) Temperature (average) Temperature (minimum) Temperature (max) Humidity (average) January 20, 2024 9305.1 10.3 4.2 16.0 74.4 January 21, 2024 12196.8 11.5 -1.1 24.2 73.4 January 22, 2024 12843.4 11.7 -4.5 23.0 67.9 January 23, 2024 167.8 3.9 -2.5 8.3 92.6 January 24, 2024 13532.9 13.4 -2.1 21.6 63.5 January 25, 2024 8719.8 10.9 -0.6 21.3 77.0 January 26, 2024 13904.6 15.2 -1.3 25.4 65.7 January 27, 2024 12671.2 12.7 -1.5 22.9 70.9 January 28, 2024 380.8 5.1 -1.4 8.2 89.8 January 29, 2024 3.8 2.3 0.0 3.9 96.1 January 30, 2024 1353.3 2.5 0.8 4.6 97.6 January 31, 2024 18.9 2.0 0.2 3.4 99.4 February 01, 2024 767.8 2.2 -1.8 6.6 97.4 February 02, 2024 10235.3 10.5 -3.4 22.5 71.6 February 03, 2024 6158.1 11.6 -1.0 22.9 89.6 February 04, 2024 2028.0 2.0 -1.8 5.2 85.9 February 05, 2024 6756.1 10.7 0.2 23.9 88.0

[0055] Table 3T2 Data records of light, temperature and humidity

[0056]

[0057]

[0058] Table 4T3 Data records of light, temperature and humidity

[0059] index Sunshine intensity (average) Temperature (average) Temperature (minimum) Temperature (max) Humidity (average) January 20, 2024 9808.1 4.9 2.5 7.9 30.4 January 21, 2024 5.4 6.3 0.5 9.7 62.2 January 22, 2024 166.4 4.9 -0.7 9.7 47.9 January 23, 2024 359.8 3.6 -4.3 9.5 84.0 January 24, 2024 13972.5 6.9 -3.5 14.0 42.0 January 25, 2024 8584.0 6.8 -2.0 14.5 53.2 January 26, 2024 13644.9 6.5 -3.0 13.9 41.7 January 27, 2024 14588.9 8.1 -3.4 14.8 45.2 January 28, 2024 937.3 4.0 -3.4 8.7 62.0 January 29, 2024 11.8 1.8 -0.9 3.7 90.3 January 30, 2024 1932.4 0.9 -1.2 2.6 75.6 January 31, 2024 16.4 1.4 -0.8 3.3 94.2 February 01, 2024 1782.5 1.4 -3.1 7.2 73.6 February 02, 2024 14916.0 3.9 -5.1 10.6 47.3 February 03, 2024 14115.5 10.6 -1.2 21.3 49.2 February 04, 2024 3716.7 0.4 -2.0 3.1 53.9 February 05, 2024 9046.8 6.2 0.2 11.6 46.7

[0060] Table 5 Comparison of light, temperature, humidity and other data in the production process of five-color leek

[0061]

[0062] As can be seen from the table above, during the production and cultivation of five-color leek (T3), the average light, temperature and humidity in the greenhouse during the day were 6329.7 Lux, 4.6 ° C, 58.8%, the maximum temperature during the day varied from 2.6 ° C to 21.3 ° C, the minimum temperature varied from -5.1 ° C to 25 ° C, and the sunshine length in the greenhouse was 8h22min-8h55min; during the production and cultivation of green leek (T1), the average light, temperature and humidity in the greenhouse during the day were 6532.0 Lux, 8. During the production and cultivation of yellow leek (T2), the average light, temperature and humidity in the shed during the day are 3.2Lux, 4.6℃, 74.4%, the maximum temperature during the day varies from 2.4℃ to 12.5℃, the minimum temperature varies from -2.6℃ to 3℃, and the sunshine length in the shed is 0-24min. During the second growth period of five-color leek, the production effect of five-color leek was poor due to the high external environment temperature (-10℃-2℃) and the indoor temperature of the shed (10℃-23℃). Therefore, temperature and light intensity are crucial to the production of five-color leek.

[0063] The production process of five-color leek is the result of the joint regulation of temperature and light. Compared with the T3 treatment (five-color leek), under similar light conditions (6581.7Lux) and light duration, when the temperature is higher (8.1℃), the leek leaves are prone to appear green (T1); under similar temperature conditions (4.6℃), when the light is weaker (3.2Lux) and the light duration is shorter, the leek leaves are prone to appear yellow (T2); the above results show that differences in temperature and light intensity will affect the color of leek leaves, and in the cultivation process of five-color leek, the greenhouse temperature is adjusted by lifting the straw thatch and greenhouse film during the day, and the five-color leek is dried using different temperatures and light intensities.

[0064] In addition, the relevant data in the above table can summarize the relevant growth process of T3 five-color leek, as follows: on January 24, January 26 to January 27, the daily average temperature was 6.5℃-8.1℃, the external light intensity was higher than 10000lx, and the daytime sunshine time was 4h-6h, the leek leaves showed purple;

[0065] On January 25 and February 4-5, the average temperature in the greenhouse was 0.4-6.2℃, the external light intensity was 3000-10000lx, and the daytime light time was 4-6h, and the leek leaves appeared red;

[0066] On February 3, the average temperature in the greenhouse was above 10°C, the external light intensity was higher than 12,000 lx and the daytime light time was no less than 4 hours, and the leaves of the leek were green;

[0067] From January 21st to January 23rd, January 29th, and January 31st, the average daily temperature in the greenhouse was between 1.4 and 6.3℃, the average light intensity was less than 400lx, and the daytime light time was less than 2h, the leek leaves turned yellow; in addition, ridges were built and sand was covered on January 22nd and January 31st, each time with a thickness of 1cm. The parts of the leek leaves covered by river sand also turned yellow after being shaded.

[0068] The leaf sheath of leek is always covered with sand, so it appears white.

[0069] Table 6 shows the effects of different temperature and light treatments on the quality indicators of leeks. There are certain differences in the quality indicators of leeks among different types. It can be seen from the table that the water content, soluble solids content, acid content and soluble protein content of the leek sheath of the five-color leek are significantly higher than those of the green leek and the yellow leek, but the soluble total sugar content is lower than that of the green leek and the yellow leek, and there is no significant difference in the ascorbic acid content among the three types; among the three types, the water content of the green leek leaves is significantly higher than that of the yellow leek treatment, and the higher acid content, soluble protein content and crude fiber content may be the main reason for the flavor of the five-color leek.

[0070] Table 6 Comparison of light, temperature, humidity and other data in the production process of five-color leek

[0071]

[0072] Table 7 is a comparison of the pigment content of leek leaves treated with different temperatures and lights. It can be seen from the table that there are certain differences in the main pigment content of leek leaves among different types. The chlorophyll content of green leek is significantly higher than that of yellow leek and five-color leek, the carotenoid and lutein content of yellow leek is significantly higher than that of green leek and five-color leek, and the anthocyanin content of five-color leek is significantly higher than that of green leek and yellow leek.

[0073] Table 7 Comparison of pigment content determination in different leeks

[0074]

[0075] The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. A method for producing high-quality five-color leek, characterized in that: In the process of arch shed planting, the specific steps of drying color are: (1) When the indoor temperature is between -4℃ and 10℃ and lasts for more than 2 days, the external light intensity is higher than 10,000 lx, and the daytime sunshine time is 4-6 hours, the leek leaves will turn purple; (2) The indoor temperature is between -4℃ and 10℃, and the external light intensity is between 3000-10000lx ， And when the daylight hours are 4-6 hours, the leek leaves appear red; (3) When the indoor temperature is above 10°C, the external light intensity is higher than 12,000 lx and the daytime light time is not less than 4 hours, the leaves of leek will appear green; (4) When there is no light or the light intensity in the greenhouse is less than 400 lx, and the daytime light time is less than 2 hours, the leaves of leek will turn yellow; (5) The leaf sheath of leek is always not exposed to light and appears white.

2. A method for producing high-quality five-color leek as claimed in claim 1, characterized in that: The variety of the leek is Hanzhong winter leek or leeks.

3. A method for producing high-quality five-color leek as claimed in claim 1, characterized in that: The leek is cultivated by direct seeding or transplanting.

4. A method for producing high-quality five-color leek as claimed in claim 3, characterized in that: The direct seeding was carried out in row sowing, and the sowing was carried out from early April to early May. Watering was carried out before sowing to maintain soil moisture, and then furrows were opened for sowing at a row spacing of 30 cm and a furrow depth of 10 cm. The seeding rate was 3.5 kg / 667 m 2 , then cover the soil, level the ditch, and level the bed surface; The transplanting is carried out using two-year-old leek roots, and a cluster planting method is adopted in March and April, with 7 to 8 leek roots forming a cluster and 15 to 20 plants in each cluster.

5. The method for producing high-quality five-color leek according to claim 1, characterized in that: The yellow color described in step (4) is presented by sand cultivation. When the leek grows to 3 cm, the first sand cultivation begins, with a thickness of 1 cm. During the growth period, the sand cultivation is performed 2-3 times in total.

6. A method for producing high-quality five-color leek as claimed in claim 1, characterized in that: During the greenhouse cultivation process, the control of leek maggots is mainly prevention-oriented, through at least one of agricultural measures, physical control, biological control and chemical control.

7. A method for producing high-quality five-color leek as claimed in claim 6, characterized in that: The agricultural measures include applying fully decomposed organic fertilizer, ensuring good drainage, timely weeding, reasonable density planting, and ensuring ventilation; The physical control is to use an insect-proof net, cover the outside of the middle arch shed with a 40-50 mesh insect-proof net, or use a sun-exposure high-temperature film coating method to control leek maggots; The biological control method is to control leek maggots by parasitizing nematodes. When the leeks are covered with ridges, insect pathogenic nematodes are released at a rate of 200,000 to 300,000 heads / m 2 ; The chemical control is to use microbial agents to control leek maggots, with a dosage of 50g / 667m 2 After harvesting the leeks, spray on the roots of the leeks and the surface of the bed.

8. The method for producing high-quality five-color leek as claimed in claim 1, characterized in that: The arch shed planting process includes post-harvest management, which includes the following steps: after the leek is harvested, all the sand in the plot is cleared, and 60-100 kg / 667 m2 of nitrogen, phosphorus and potassium fertilizers are applied. 2 , water thoroughly, apply medicine to prevent and control leek maggots, and then manage normally.

9. The method for producing high-quality five-color leek according to claim 1, characterized in that: The light and temperature are adjusted by lifting the straw thatch and opening the gaps to let in air.

10. The method for producing high-quality five-color leek according to claim 1, characterized in that: The arch shed is constructed with steel bars or bamboo and wood to form an arch frame, with a span of 5m, a height of 1.5m, and a length of 60-80m. Four steel bars are built in the east-west direction, and the north-south steel frames are spaced 90cm apart.

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