How to plant watermelon in greenhouse and in what month?

How to plant watermelon in greenhouse and in what month? Watermelon cultivation in greenhouse is intensive and highly technical. Comprehensive supporting measures must be taken to achieve the goal of early maturity, high yield and high efficiency.

1, soil preparation and fertilization. The cultivation density of early-maturing watermelon in greenhouse is generally high, which requires careful soil preparation. If you use a winter shed, plow 25 cm deep before winter, and loosen the soil in the frozen bag. Sprinkle half of the base fertilizer, then turn it into the soil, level it, and then furrow it for centralized fertilization and border tillage. When preparing the soil, the roots of the previous crop should be picked out from the shed.

Generally, small ridges and high ridges can be used for border planting in greenhouses, and the line spacing of L- 1.2m shall prevail for border planting ... In the case of close planting in scaffolding, grafting cultivation, pruning of two vines and keeping one melon for one plant, the line spacing of 1 m is suitable for small ridges, and the north and south borders (parallel to the greenhouse longitudinal direction) can be used for ground crawling.

Amount and type of base fertilizer: Generally, 4000-5000 kg of high-quality manure (or 3000-4000 kg of decomposed chicken manure), 50 kg of calcium superphosphate, 0/5-20 kg of potassium sulfate/kloc, and 0/00 kg of decomposed cake fertilizer/kloc-are applied per mu. Half of the organic fertilizer in the base fertilizer is applied in general tillage, and the other half is applied in high-yield ditch.

2. Transplanting and planting. Watermelon in greenhouse can be planted about 10 days earlier than watermelon in three-layer film arch shed. Generally speaking, the planting density in greenhouse can be higher than that in arch shed, and it needs more careful pruning. The density of shed cultivation is higher than that of creeping cultivation on the ground. The greenhouse should not be over-densely planted, especially in areas with rainy and weak light in spring.

Planting method of watermelon in greenhouse; First, draw planting points on the border of the buckle film according to the plant spacing, then plant in sunny days, and finish planting from 9 am to afternoon. The size of planting holes should be adapted to the size of clods or nutrient bowls. Then pour an appropriate amount of bottom water into the hole, and wait until the water just seeps down to plant seedlings. When planting seedlings, carefully remove the plastic bowl first, and plant the complete clod into the planting hole, so that the surface of the clod is flush or slightly exposed. Fill the soil immediately after placing the seedlings. Gently compact the fill around the mound by hand, or temporarily seal the nest on the day of planting, and seal the nest after watering again the next day to facilitate the slow growth of seedlings. After the whole shed is planted, you can clean the border, insert a small arch frame on the border, and buckle the film on it to form a one-stop small arch shed. Because there is no wind in the greenhouse, the arch can be simpler, and the small arch shed can also be covered with plastic film, so it is not necessary to press it tightly. When the weather is warm, it can be uncovered day and night. In order to replenish seedlings, more backup seedlings should be planted in the shed at the same time. In order to improve the soil temperature on the day of planting, it is best to finish planting before 2-3 pm.

3. Temperature and humidity control in greenhouse.

① Humidity management. Within 5- 17 days after sowing, attention should be paid to raising the ground temperature to keep it above the solitary temperature, so as to promote the delay of seedling emergence. If the temperature is higher than 35 degrees during the day, you should try to shade the sun and cool down. After the seedlings are delayed, ventilation can be started to adjust the temperature in the shed, which is generally not higher than 3T-32 degrees during the day and not lower than 15 degrees at night. In the meantime, the shed temperature can be controlled by opening and closing the skylight. When the vines grow to about 3t cm, the small arch shed can be removed. When watermelon is in full bloom in greenhouse, we should keep sufficient light and high night temperature, because if the night temperature is low after artificial pollination, it will cause fruit dropping and affect fruit hypertrophy. When the outside temperature exceeds 18 degrees, ventilation should be increased, and both sides of the skylight and shed should be ventilated at the same time, and the daytime temperature should not be higher than 30 degrees to prevent the temperature difference between day and night from being too large and the daytime temperature from being too high. At this stage, watermelon enters the expansion stage and maturity stage, and the high daytime temperature and large daily temperature difference will lead to the deterioration of fruit quality and quality.

② Humidity management. The relative humidity of the air in the greenhouse is high, which can be obviously reduced under the condition of covering with plastic film. Generally, in the early stage of watermelon growth, the air humidity in the greenhouse is low, but after the vines are covered with leaves (bracket cultivator) or closed (crawling cultivator), the air humidity in the greenhouse increases due to the large transpiration and the increase of irrigation. The relative humidity is generally 60%-70% during the day and 80%-90% at night. In order to reduce air humidity and diseases in the shed, some measures can be taken, such as closing the shed on sunny and warm days, increasing air circulation and spreading grass between rows to reduce soil evaporation. It is advisable to keep the relative humidity at 60-70% in the middle and late growth period.

4. Adjust lighting and gas composition.

(1), increase the amount of lighting. Watermelon requires light intensity. However, the light intensity in the shed often decreases due to the condensation of the film or the unclean surface, especially in the case of multi-layer coverage. Therefore, we should pay attention to keep the shed film clean, and don't use the old film with poor light transmission. The light in the greenhouse mainly comes from the top (glass window) and the side (side light), and the plastic film also has a certain reflection effect in the early stage of growth. Under the condition of close planting in shed, the normal photosynthesis of leaf area above ground 1 meter has great influence on watermelon yield. Therefore, during the growth period of watermelon, the light from the top and both sides of the shed should always enter the shed unimpeded, so that the leaves above 1 m in the shed can get enough light in the middle and late growth period. Therefore, it is necessary to trim, weigh and top in time strictly, so that the top blade of the frame is 30-40 cm away from the film on the roof of the shed to prevent the line, top and side from closing. When tying vines, pay attention to the leaf spacing of 20-30 cm to prevent overlapping.

② Gas regulation in the shed. The content of carbon dioxide in the air in a closed greenhouse is seriously insufficient, which affects the normal photosynthesis and the accumulation of assimilation products. Carbon dioxide fertilization is to artificially increase the carbon dioxide concentration in the greenhouse and supplement the insufficient carbon dioxide content in the greenhouse. The method is as follows: firstly, fresh horse manure is piled in the shed, which can release carbon dioxide during the fermentation process, and 5-6 kg is piled up per 1 m3 space; Secondly, burning propane gas will produce carbon dioxide. Burning 1.2- 1.5 kg in a greenhouse with an area of 600 square meters can make the carbon dioxide concentration in the greenhouse as high as 1.3 ml/L. The amount of propane gas burned can be determined according to the greenhouse area. Thirdly, the application of coke carbon dioxide generator can release carbon dioxide when coke is fully burned; Fourthly, the simplest method is to put concentrated hydrochloric acid in a container that is not corroded, and then put a small amount of stone flow (calcium carbonate), which can produce carbon dioxide through chemical reaction. The period of carbon dioxide fertilization is mainly in the peak period of watermelon growth, especially in the fruit development period; The optimum time is around 10 in the morning, and the optimum concentration is1-1.5 ml/L. Ventilation measures must be taken to keep the gas in the shed fresh and prevent the accumulation of harmful gases.

5. The whole branch is tied with vines.

(1), pruning. Under the condition of close planting in greenhouse, strict pruning should be carried out. When the main vine is 30-50 cm long after elongation, the lateral vine has also been obviously elongated. When the lateral vines grow to about 20 cm, choose a robust lateral vine from the middle, remove all the others, and remove the lateral vines growing on the main vine and the lateral vine if necessary. Leaves 10- 15 leaves are above the melon node to the top. Pruning is mainly done before the melon sits down. In the case of scaffold cultivation, the work of removing lateral vines (rakes) should be carried out until the frame is full and the top is capped. When the lateral vines are removed, the tendrils are removed.

(2) Tie vines on the scaffold. In the case of greenhouse bracket cultivation, vertical frame should be adopted. Bamboo poles can also use hanging ropes, but it is best to use thick bamboo poles, because bamboo poles are not easy to drop melons. More than 20 days after planting, the main vine is about 30 cm long. After the small arch shed in the greenhouse is demolished, the armor can be checked immediately. Two bamboo poles can be inserted according to each seedling. Bamboo poles should be firmly inserted and erected on both sides of the plant, which is more than 10 cm away from the root of the plant. After inserting the bracket, the vines will be guided and knotted. When the vines grow to 30-40 cm, you can lead the creeping melon vines to vertical poles, one pole for each vine. Pay attention to the management of vines when tying vines, and be careful not to touch big melons in the later stage. Vine binding and pruning can be combined. In the case of climbing cultivation on the ground, the pruning method of watermelon in greenhouse is basically the same as that in double mulching cultivation, but because it is in greenhouse, it can be pulled and cut in time after stretching, and measures such as vine pressing can also be omitted. In the case of climbing cultivation in greenhouse, strict pruning should also be adopted, and the double vine pruning method should be used in close planting.

6. Artificial pollination. Because of the flowering habit of watermelon in greenhouse, pollination should be carried out at 8-9 am. On cloudy days, the male flowers are scattered late, which can be postponed appropriately. In order to prevent the male flowers from spreading pollen in the late rainy day, we can retrieve the male flowers that can bloom the next day in the afternoon of the first day, put them indoors under dry and warm conditions, make them bloom and spread pollen on time the next morning, and then use this flower to pollinate the female flowers. Pollination should start with the second female flower. So as to keep the melon.

7. Choose melons to hang melons. In order to increase the weight of a single melon and make it straight, we should choose to leave the melon sitting on the second female flower. Leaving the melon too early, the melon is small, the melon shape is not straight, and it is too late, which is not conducive to early listing. Generally, the melon embryo will grow obviously 3-5 days after pollination, so the melon should be left on the main vine first. Stay on the main vine, but stay on the side vine. In the case of bracket cultivation, when the melon grows to the mouth of the bowl about 0.5 kg, it should be hung up in time to prevent the young melon from falling after growing. In the case of climbing cultivation on the ground, melons should be selected, padded and ploughed like arch shed cultivation.

8. Topdressing and irrigation. Watermelon in greenhouse should not be watered too much in the early stage. Generally, after delaying the emergence of seedlings, if the ground is not dry, you can not water it; If it is too dry, you can water it once along the ditch. After that, keep the ground dry and wet, control irrigation, raise the ground temperature, and make the seedlings strong. During the vine extension period, you can water it twice before inserting the bracket. The amount of water is moderate. Do not water during flowering and fruit setting to prevent overgrowth and promote fruit setting. When the young melon grows to the size of an egg, it can be watered every 3-4 days to promote the expansion of the young melon. Under the condition of supporting cultivation, watermelon in greenhouse can be topdressed by applying 20 kg/mu of nitrogen and phosphorus compound fertilizer and 5- 10 kg/mu of potassium sulfate in shallow ditches on both sides of melon ridge before supporting cultivation and after the small arch shed in greenhouse is removed, so as to promote root extension and tree growth and lay a foundation for flowering and fruit setting. After the young melons sit down and grow to the size of eggs, apply (combined with irrigation) 20 kilograms of compound fertilizer per mu to promote the long melons. After the fruit is fixed, topdressing the leaves with 0.3% potassium dihydrogen phosphate for 1-2 times. In the case of harvesting the second crop of melons, you can harvest the second crop of melons, and then apply ternary compound fertilizer 15 kg/mu after harvesting the first crop of melons.

9, pest control and other management. The main pest of watermelon in greenhouse is aphid. In order to control aphids, 2000 times DDV ++ dimethoate (1: 1) can be sprayed on the seedbed before planting. At the peak of melon expansion, the vines in the shed are lush, the air circulation is poor, and aphids are serious. We must pay attention to strict pesticide control. The main disease is powdery mildew, which should be prevented as soon as possible. The prevention and control of anthracnose should start from the swelling stage of watermelon, and the disease of watermelon can be greatly alleviated by strengthening ventilation and reducing the air humidity in the shed in the middle and late growth stage. Greenhouse watermelons, especially those cultivated in scaffolding, can produce high-grade watermelons with good appearance, bright peel and no positive and negative sides because of their good fruit protection conditions and good light reception.

How to grow watermelon in greenhouse? Select improved varieties.

Variety [1]

Choose early-maturing watermelon varieties with cold tolerance, disease resistance, high sugar content, good commodity and storage and transportation resistance, such as Xin Jing, Xinhongbao, Wangzhezun, Xinong No.8 and Xin Jing No.2..

(2) Seed quality

Seed purity should be above 98%, germination rate should be around 90%, and purity should be above 90%.

Second, stubble arrangement

In early spring, the cultivation of large arch shed adopts multi-layer covering techniques such as adding small arch shed and covering with plastic film in the large arch shed to improve the ground temperature and air temperature as much as possible. Huachi county is suitable for sowing in the middle and late February, sowing in the late April and harvesting in the middle and early June, with high yield and good benefit.

Third, raise seedlings.

[1] Manufacturing method and specification of seedling pot

Made of old newspapers, waste plastic films, shed films and other materials into bottomless cylinders with specifications of 8cm×8cm or 10cm× 10cm; You can also directly use the finished plastic nutrition bowl.

[2] Preparation of Nutrient Soil

7 parts of garden soil (fertile soil without cucurbitaceae crops), 4 parts of fully decomposed high-quality farm manure, 1 part of decomposed horse manure and 1 part of plant ash were crushed, mixed and sieved, and 40g of 50% carbendazim was added to each cubic meter of nutrient soil (mixed with nutrient soil after being made into aqueous solution), and 40% methyl isocarbophos was used. The nutrient soil is covered with plastic film and drilled for 2-3 d, and then put into a bowl for later use. When put into the bowl, leave a space 3 cm high in the bowl to cover the sowed soil.

(3) seed treatment

Dry 1d seeds in sunny days, and the seed dosage of 667 square meters is 50- 100g. Soak the seeds in warm water at 55℃, and keep stirring when pouring warm water. When the water temperature drops to 30℃, soak them for 65438±0h hours, and then soak them in 200 times of 40% formaldehyde for 30min. After cleaning the seeds, use warm water at 30℃.

(4) Selection of nursery land

Use sunny seedbeds to raise seedlings, and choose fields with sunny leeward from east to west, which is convenient for transplanting and transportation. A 60cm high earth wall is built on the north side of the boundary. The gables on both sides of the boundary are arc-shaped, covered with film and covered with grass at night. The width of the seedling bed is1.5-2m, and the depth is 25-30cm. The length depends on the number of seedlings.

[5] Sowing

Sow in sunny days around February 15. Put the nutrition bowl neatly in the seedbed, water it, spray 3 kg of water on the bed surface with 2 mL of transplanting spirit per square meter after the water permeates, and sow after the medicine permeates the soil. Sow 2 seeds in each nutrient bowl to accelerate germination, cover with 2-3 cm thick nutrient soil, then cover the whole seedbed with film and cover with grass at night.

(6) Seedbed management

Uncover the plastic film during the day and cover it at night before emergence. Do not open the plastic film. The temperature is controlled at 30-35℃ during the day and 20℃ at night. After the seedlings grow completely, cover with 1cm nutrient soil to support the seedlings. The temperature of 1 blade before deployment is slightly lower, which is 25-28℃ in the daytime and 15- 18℃ at night. According to the situation of seedbed, generally water 1 time every 2-3 days. Seven days before sowing, the seedlings were tempered to improve the survival rate.

Fourth, colonization.

[1] Soil preparation and fertilization

Watermelon fields must be ploughed in autumn and ploughed 1-2 times after thawing in the following year. In autumn ploughing, 5000 kg of high-quality farmyard manure, 25 kg of diammonium phosphate 15 kg of calcium superphosphate and 25 kg of potassium sulfate 10 kg were applied at one time, and then deep ploughing was carried out; At the end of March of the following year, plough and harrow, then apply 30kg of diammonium phosphate, 50kg of potassium sulfate 10kg, 50kg of decomposed bean cake and 30kg of high-efficiency compound fertilizer.

(2) ridging and film mulching

Ridge 10 d before planting, ridge width 1.2m, furrow width 0.3m, slightly high in the middle of the border, and then cover with a film with a width of 1.4 m, so the border is suitable for east-west direction.

(3) Building an arched shed

5 d before planting, buckle the shed to warm the ground. The steel-framed greenhouse in Huachi County was built according to the specifications of 40m×6m, and the film was fixed with string or film pressing line to prevent strong wind from damaging the film.

(4) Colonization

Choose sunny days around April 15, plant 850-980 plants per ridge 1 row, row spacing 1.5 m, plant spacing of 45-50 cm and 667 m2. When planting, drill holes with a seedling transplanter, irrigate each hole with 1 kg, sow after water seeps down, seal the holes with soil after sowing, and then compact the greenhouse film. Irrigation along the ditch after planting seedlings.

Verb (abbreviation for verb) Post-planting management

[1] temperature management

After transplanting, close the shed on time, let the air out and adjust the temperature in the shed. Before slow seedling, the temperature was kept at 30℃ during the day and above 65438 05℃ at night. After slow sowing, the temperature is 25-28℃ during the day and 65438 02℃ at night.

(2) Water and fertilizer management

[3] urge the trees to water

After delaying seedling, watermelon grows rapidly and enters the cluster stage (5-leaf stage). In order to promote plant growth and make it elongate rapidly, it is necessary to apply topdressing as soon as possible, with 667m2 urea and 10kg diammonium phosphate as topdressing, and then irrigate in the ditch until it is dry, so as to keep water and promote root development.

[4] swollen melon water

After the fruit is set, when the egg is big, the young melon should be applied with 1 fold swelling water, topdressing 667 square meters of potassium sulfate 15 kg, and high-efficiency compound fertilizer 20 kg. During the watermelon expansion period, 1 times of small water can be applied, and the amount of water is generally 1/3 ditch depth, so as to avoid flooding the border and causing the death of rotten seedlings. At the late stage of melon-bearing, 0.3% potassium dihydrogen phosphate or 0.2%-0.3% urea solution was sprayed on watermelon leaves to make them yellow and finally wither, and topdressing was applied outside the roots. Watermelon essence, amino acid, organic ecological fertilizer, etc. You can also spray 10d/time.

How to plant (irrigate) watermelon 8424 in greenhouse in early spring with water-soluble fertilizer of 5 kg/mu.

(Spraying) Ye Shuo melon special foliar fertilizer 40g/mu.

Cucumber nutrition plan

1, after transplanting-vine extension period

Flushing application: root water is poured once after transplanting and sprayed once during vine extension to promote roots and slow down seedlings and reduce dead seedlings;

Spraying: spraying twice continuously with an interval of 7- 10 day to promote flowering and strengthen flowering and improve fruit setting rate;

2, sitting melon period-melon expansion period

Flushing: when the melon eggs are big, wash them once, so that the melon is straight, the melon expands quickly, the flesh is bright red, and the taste is crisp and sweet; In the expansion stage, it is coated with 1-2 times, which is fast in expansion and sweet in taste.

Foliar spraying: spraying twice continuously from the melon-sitting stage to promote flowering and strengthen flowers, improve the melon-sitting rate and reduce melon cracking and navel rot;

3. Recovery after harvest-the end of two melons

Rinse: rinse twice continuously, with an interval of 5 days, and rinse twice for each batch of melons, so as to prevent vine dropping, restore vine vigor, reduce yellow leaves lacking in vegetable, rapidly expand melons and improve later yield;

Foliar spraying: reduce the shortage of yellow leaves;

Using greenhouses and other protected areas to cultivate high-grade gift watermelons has formed a large scale in Shanghai, Zhejiang, Shandong and Beijing. In recent years, the introduction, research and popularization in southern provinces, especially in the Yangtze River basin, have produced good economic and social benefits. For example, "early spring ruby" watermelon, which is common in the market, is sold in most large and medium-sized cities in China and is favored by consumers. Planting gift melons in greenhouses in early spring is a good way to generate income and increase efficiency.

Construction of greenhouse South greenhouse For watermelon planting, the primary function of greenhouse is rain protection, followed by heat preservation. Watermelon is most afraid of too much rain, but there is a lot of rain in the south, especially in spring and summer, which leads to unstable watermelon production in this area. This problem can be well solved by covering the greenhouse with rain-proof cultivation. Plastic greenhouses should be built on the land with high terrain, easy drainage and sufficient sunshine, which is suitable for planting watermelons, especially in paddy fields where melons have not been planted for many years. Generally, it is 7 ~ 8m wide, 25 ~ 30m long and 2 ~ 2.5m high. Bamboo shed, cement shed or steel shed can be used. This form of cultivation costs a lot, and land selection is the key. Generally, it is only suitable for planting in the same place for 65,438+0 years. In the second year, it will be changed to a planting plot suitable for not planting melon crops for many years. Therefore, it is necessary to consider its detachable efficiency when building a greenhouse.

Variety Selection High-grade varieties should be selected for watermelon cultivation in greenhouse in early spring to achieve the purpose of high-grade, high-quality and high efficiency. At present, the most widely used variety in production is Early Spring Ruby, and other varieties include Zaojia, Xiaolan, New Jin Lan, Li Xiu, Beautiful and Elegant, Ice Crystal, Huamei People, Hongxiaoyu, Huang Xiaoyu and so on.

Early seedling raising is the basis of this technology. Generally, seedlings are raised in sunny days from July to February around the Spring Festival. The nutrition bowl for greenhouse seedling cultivation is covered with multiple layers, and it should be equipped with insulation and anti-freezing facilities, such as ground wire and high-power light bulb, so as to facilitate germination and sowing, emergence as soon as possible and reduce the probability of freezing injury. The temperature in the Yangtze River basin is low in June and March, and there are often cold waves. When watermelon seedlings are raised, freezing injury is most likely to occur from sowing to seedling stage, especially from sowing to seedling stage. It will be dangerous if the temperature is lower than 10/~ 2 days, so it is necessary to avoid the cold wave as much as possible or adopt heating protection facilities. In addition, keeping the seedbed and nutrient soil as dry as possible is also an effective measure to improve the ability of cold resistance and disease resistance. In order to promote the growth of seedlings, it is necessary to irrigate fertilizer and water in sunny days, and the nutrient soil will dry for 1 ~ 2 days after irrigation, which is beneficial to improve the cold resistance and disease resistance of plants.

Covering cultivation in early spring is generally divided into three layers, namely greenhouse, small arch shed and plastic film. Full mulching with plastic film has the advantages of enhanced heat preservation and water retention efficiency, no weeds, no soil on vine leaves and fruits of watermelon, irrigation with fertilizer water under plastic film, reduced infection of pests and diseases, and improved fruit appearance.

Fertilization is relatively difficult because of the full coverage of plastic film, so it is necessary to apply sufficient base fertilizer before planting. The base fertilizer should be cake fertilizer, livestock fertilizer, soil miscellaneous fertilizer, potassium sulfate compound fertilizer and other after-effect fertilizers, but only after fermentation, the quick-acting fertilizer should be applied less. Drip irrigation under plastic film is used for watering and topdressing, that is, the drip irrigation pipe is placed 50 cm away from the field before plastic film mulching, and the fertilizer is fermented, soaked and filtered before drip irrigation, which is beneficial to protect the vine leaves and fruits of watermelon. After picking a batch of melons, topdressing should be done in time to facilitate continuous fruit setting.

Plant and Fruit Management When the plant grows to about 1 m, prune it with 3 ~ 4 vines to ensure that each plant bears 2 ~ 3 fruits at a time. Pruning in sunny afternoon is generally chosen to avoid breaking and damaging vine leaves, which is beneficial to wound healing and reducing disease infection. In early spring, due to low temperature, few insects and difficulty in fruit setting, measures such as artificial pollination and bee release can be taken to promote fruit setting. In order to improve economic efficiency, low-end places can also sit on the masses and go public early. Deformed melons and cracked fruits should be removed in time. Small watermelons are generally of good quality, and the quality is high when they are eight ripe, especially in high temperature season. They can mature more than 20 days after fruit setting, so they should be picked in time to go on the market, otherwise they will be over-ripe. If long-distance transportation is needed, it should be packed in cartons to avoid melon cracking.

How to plant watermelon in greenhouse in early spring? Ruby belongs to the gift watermelon, ranking first among watermelons with its unique taste sweetness! My implant generally has three wrists, two main wrists and one negative wrist! Erdaogua Niuzuogua

Watermelon planting in greenhouse can withstand several degrees of low temperature not less than 15 degrees at night. Temperature and humidity control in greenhouse ①. Humidity management. Within 5- 17 days after sowing, attention should be paid to raising the ground temperature, keeping it above the solitary temperature, and promoting the delay of seedling emergence. If the temperature is higher than 35 degrees during the day, you should try to shade the sun and cool down. After the seedlings are delayed, ventilation can be started to adjust the temperature in the shed, which is generally not higher than 3T-32 degrees during the day and not lower than 15 degrees at night. In the meantime, the shed temperature can be controlled by opening and closing the skylight. When the vines grow to about 3t cm, the small arch shed can be removed.

Planting techniques of melon and watermelon in greenhouse prefer sandy loam with strong permeability, and low-lying water storage land and paddy field cannot be selected. Apply 5000 kg of farm manure, 0/5 kg of diammonium/kloc-and 5 kg of potash fertilizer once per mu. Ridge In general, two ridges are planted to leave an empty ridge, and a drainage ditch is left between the two ridges. It can be transplanted in late April, with 0/0.7 million plants per mu/kloc, digging holes according to the plant spacing of 0.4m, and applying a small amount of hydrazine to each pit. After watering, plant seedlings and cover them with plastic film. Put plastic film on the seedlings, let the seedlings protrude from the hole, seal the roots of the seedlings with fine soil, fasten them with a small arch shed, and then fasten them with a big arch shed.

Manage ventilation when the temperature exceeds 25℃ during the day, and turn off ventilation when the temperature drops to 20℃. When the outside air temperature is kept above 15℃ during the day, the small arch shed is removed, leaving only the plastic film and the large arch shed, which is kept from beginning to end, and closed at night and in rainy days to avoid direct contact with rain and dew and prevent seedlings from getting sick. In case of drought, irrigation can be carried out in the border under plastic film. The humidity in the shed is within 50 ~ 60%, and it is easy to get sick if it exceeds 70% for a long time. When the seedlings have 4-6 true leaves, pick the buds, and after 3-4 sub-vines bear fruit, pick all the Yang vines behind the fruit, and leave 3-4 leaves in front of the fruit for coring.

The main diseases of melon pest control are downy mildew, powdery mildew and Fusarium wilt. Insects are aphids. Spraying toxomyl and triadimefon alternately every 7 days. If aphids are found, dimethoate can be used to control them. Stop using pesticides before harvest 15 days.

1, site selection and soil preparation. Watermelon is drought-resistant and waterlogged-resistant, and cannot be continuously cultivated. Land selection should choose fertile and well-ventilated sandy loam. Generally, the garden where watermelons are planted continuously is not selected, and the soil preparation should be deeply cultivated. The border ditch and waist ditch are connected with the surrounding ditches, which is convenient for irrigation and drainage.

2. Fertilizer and water management. Sufficient basal fertilizer and reasonable topdressing are the prerequisites for high yield and high quality of watermelon. Base fertilizer accounts for about 60%-70% of the total. The best application method is furrow application or acupoint application, with organic fertilizer as the main application, cake fertilizer per mu 100kg and bone meal 50kg. Farmers without cake fertilizer and bone meal can use 50-80 kilograms of ternary compound fertilizer, 2,000-3,000 kilograms of stable manure and 20,000 high-quality compost. Topdressing depends on the growth period of watermelon. After watermelon is planted, sufficient seedling fertilizer should be applied, that is, 20kg ternary compound fertilizer per mu, applied in ditches or holes, 65,438+00-20kg ternary compound fertilizer for 5-6 real leaves, and 65,438+0000kg fertilizer for young fruits (the size of eggs), that is, applied in ditches or holes per mu.

Greenhouse watermelon planting technology ppt needs artificial pollination. Pay attention to disease,

Watermelon can be planted in the greenhouse in August. The south says greenhouse, while the north only says skeleton and film greenhouse. There are earth walls, skeletons, films and heating devices. Jilin belongs to the northeast, and it is cold in winter, which is suitable for greenhouses. I hope I can help you.