When is the best time to grow watermelons?

Question 1: Introduction of watermelon planting time. When is the best time to grow watermelon? The sowing date of watermelon is generally determined according to the variety type, cultivation purpose and market date. Generally speaking, some early-maturing varieties should be planted in mid-March and listed in mid-July; Late-maturing varieties can be delayed until the middle and late April, and harvested from late July to early August; Planting in the open field after autumn is suitable for sowing from late June to mid-July and harvesting from September to 10; Autumn greenhouse cultivation is generally sown from late July to early August and listed after the National Day.

Question 2: When is the right time to plant watermelon? Suitable time for planting watermelon:

1. Spring stubble

After late frost, there are seedling transplanting, bud transplanting and direct seeding.

2. Summer stubble

In the Huang-Huai-Hai region, sowing is carried out from late May to early June, and harvesting is carried out in the middle and late August.

3. Autumn stubble

In the Huang-Huai-Hai region, the seeds are sown in the first half of July, sown in the second half and harvested in the second half of September. This batch of watermelons went on the market during the National Day and Mid-Autumn Festival, which has a certain consumer market. In addition, this crop of watermelon can be stored until the end of the year and harvested in time.

Introduction of cultivation time in protected land:

1. Early spring crop

Including small arch shed, plastic film ten small arch shed, plastic film ten near the ground cover and wind barrier ten small arch shed and other cultivation forms. It can be planted 20-25 days earlier than the local open field, including seedling transplanting, bud transplanting and direct seeding. Hybrid seedling transplanting can make full use of protection facilities to achieve the goal of early maturity. When transplanting seedlings, it can be done 30-35 days before planting, that is, 55-60 days before the local open field planting period, in the sunny field or cellar in Xiao Nuan.

2. Cultivation in early spring

Large and medium-sized shed cultivation in early spring is a common cultivation method at present, which is not only relatively simple in equipment, but also easy to master in production technology. Especially during the listing period, the local daily average temperature rose above 20℃, and the market has begun to accept a large number of watermelons, which has very ideal economic and social benefits. In the Huang-Huai-Hai region, it is generally planted at the end of June 1, sown in the middle and early March, harvested the first crop of melons in early May, and harvested the second crop in early June. 3. Delayed cultivation in autumn

Sowing in the Huang-Huai-Hai region is generally around mid-August, and sowing in late August or early September. Before the average daily temperature drops to 18℃, it must be harvested with plastic film in early and middle June. Other regions can refer to it. The sowing date of this kind of watermelon should not be too late, especially in the Huang-Huai-Hai area. In June165438+1October, cloudy and snowy days are often encountered, and the consequences of not maturing before will be more serious. When this batch of watermelons came on the market, it was already very cold. If there is storage and supply of watermelon in the open field in autumn, the practical significance of production is not great. If you have special needs, you can consider arrangements, and you can extend the supply to late winter through storage and preservation.

4. Winter and spring stubble

The key point is to solve the market supply after the spring weather gets warmer. Due to the influence of market demand, the benefit of early listing is not necessarily good, but it increases the difficulty of production. In Huang-Huai-Hai area, it is usually sown in early October, mid-late February and early April. The second crop of melons arrived in early and mid-May, which was basically the same as that in plastic shed and the first crop of melons in early spring. Northwest and northeast regions may postpone the sowing date as appropriate.

Question 3: When do you plant watermelons and what should you pay attention to? 1. Sowing date:

Watermelon cultivation in the open field is cultivation without protective equipment. The climate varies greatly from place to place, so the sowing time is different. Because of the high temperature in the south, the sowing time is earlier, and the sowing time in the north is generally later, but the early tillage time can also be used accordingly. In spring, when the local final frost has passed and the ground temperature is stable at about 65438 05℃, the suitable time for sowing in the open field is generally. The best sowing date should also be determined according to the variety, cultivation season, cultivation method and edible season. Arc 2. Seed treatment and germination acceleration:

1) Sun-drying: Sun-drying for two noon to improve the germination ability of seeds.

2) seed soaking: soak the dried seeds in warm water (about 30℃) for 6 hours, then take out the seeds, wrap them with towels or coarse cloth, grind off the mucous membrane on the seed skin, and use more than 60% 800 times solution? Happiness or 70% happiness? Soak methyl sulfide wettable powder for 4 hours, and take out the liquid medicine washed with clear water to prevent Fusarium wilt.

3) Accelerating germination: Put the soaked seeds flat on a wet towel, cover them with a layer of wet towel, and put them at a constant temperature of 33℃ to accelerate germination (if they don't germinate for 24 hours, then rinse them with clear water).

3. Preparations before broadcasting:

1) Land selection: Watermelon planting should choose plots with loose soil, good air permeability, convenient drainage and transportation. Watermelon fields cannot be continuously cropped, and it usually needs to be rotated once every 5-6 years. Otherwise, the blight will be very serious.

2) Selection of stubble: The previous stubble has great influence on the yield, quality and disease resistance of watermelon. Good previous crops can improve yield and quality, increase disease resistance and lay the foundation for high yield and bumper harvest. The first crop of watermelon planting is wasteland, followed by the second crop of wasteland and cereal crops, and the bean stubble and vegetable field are not ideal, so it is impossible to continuously crop melon stubble.

3) Soil preparation: In order to create a soil environment which is suitable for the growth and development of watermelon roots, it is necessary to cultivate deeply in Gua Tian, and it is best to turn the ground in winter. In the plot with deep ploughing or deep ploughing foundation, according to the row spacing of tillage, base fertilizer (broken ridge and sandwiched fertilizer) is applied in the subsoiling ditch to prepare the border for plastic film mulching or sowing.

4) Fertilization: Basic fertilizer is the basis of high yield of watermelon, and insufficient basic fertilizer will aggravate the anthracnose of watermelon, resulting in low yield and poor quality. According to the test results, the application of high-quality farmyard manure of 5,000 kg per mu not only has large melons and high yield, but also has less diseases, good quality and high commodity rate. If farmyard manure is not enough, biological bacterial manure can also be used as base fertilizer. If chemical fertilizer is used as base fertilizer, the ratio of nitrogen, phosphorus and potassium must be appropriate. The total absorption ratio of nitrogen, phosphorus and potassium in the whole growth period of watermelon is 3.28: 1: 4.33.

4. Sowing point:

Plastic film for watermelon planting can be planted first and then covered with plastic film, or covered with plastic film before planting.

1) sow first, and then cover with plastic film: plan a big pit on the whole frame, sow in the middle of the pit, cover it with 2 cm soil, leave a small pit with a depth of 10 cm, and then cover it with plastic film, so that each small pit becomes a simple greenhouse. This method of plastic film mulching is often used to protect seedlings in drought-resistant areas in order to go on the market early in early spring when the ground temperature is low. The advantages are early sowing, early emergence, early maturity and early listing. The disadvantage is that the seedlings are easy to grow in vain, and the seedlings will be roasted to death if they are not released in time, and the seedling survival rate is low.

2) Film mulching before sowing: In order to improve the ground temperature, cover the film in advance. When the ground temperature rises above 15℃, punch holes in the film and sow with an iron tube with a diameter of 5 cm. Sowing time is seven days before the end of the last frost (the last frost in spring), and wet soil cannot be used when covering soil, otherwise hard cover will appear. This method is simple, easy to cover with plastic film, and has high seedling protection rate. Generally, people who grow melons for the first time are easy to succeed.

5. Reasonable close planting:

Watermelon is a light-proof crop, which is planted too thinly, resulting in waste of soil fertility and serious loss of light leakage. Although sparse planting may increase the yield per plant, the population yield will decrease. Too dense planting, overlapping leaves, premature yellowing and shedding of lower leaves, weakened plant growth, reduced yield per plant and increased proportion of small fruits. Although the population yield may be slightly increased, the commodity rate and quality are reduced. The suitable density is row spacing 1.4m and plant spacing 0.7m. Intercropping and interplanting can increase row spacing to 1.8 ~ 2.0m and plant spacing 0.7m.. ..

6. On-site management:

1) Fertilization: Fertilization in Gua Tian should be sufficient, precise and skillful, that is, adequate base fertilizer, precise seed fertilizer and skillful topdressing.

Base fertilizer: it is the basis of high yield and an important measure to prevent diseases. & gt

Question 4: What season is suitable for growing watermelons in South China? The best season to grow watermelons in South China is to raise seedlings during the Spring Festival and sow in February and March. As long as the temperature can be between 18-35, it can be planted continuously.

It is best to grow watermelons with farmyard manure (spring and autumn). There are many kinds of farmyard manure, including miscellaneous manure, dry manure, human excrement, plant ash, chicken manure, pig manure, rapeseed cake and so on. Soil miscellaneous fertilizer is the most accessible and widely used organic fertilizer in rural areas. Generally, it should be sown in the high-yield ditch 15~20 days before sowing or planting, or it can be scattered on the ground before turning the ground, so that it can turn underground when turning deeply. Manure is a mixture of a small amount of soil in the sun, which can be used as the base fertilizer or topdressing of watermelon. Human excrement is a kind of organic fertilizer, which is mainly used as topdressing after fermentation. Plant ash can be used as a potash fertilizer with the best topdressing effect. Chicken manure and rapeseed cake are organic fertilizers with high phosphorus and potassium content. After full fermentation, it is used as base fertilizer, which has many nutrients and long fertilizer effect, and is a good fertilizer for cultivating watermelon.

Question 5: When it is suitable to grow watermelon depends on the different cultivation methods, varieties and regions.

Watermelons in the open field are mostly planted in March in spring.

Protected cultivation (such as greenhouses) is almost free from seasonal restrictions.

Also, different planting areas have different suitable planting time, and Hainan Island can also be planted in winter.

Different varieties have different cultivation time.

Question 6: Introduction of watermelon planting time. When is the best time to plant early-maturing watermelon? Sow from mid-February to late March, medium-ripe watermelon from April to June, and late autumn watermelon in mid-July.

Question 7: How to plant watermelons and when to start planting watermelons? Because watermelons like fertile, loose and deep soil, intertillage must be carried out before winter, and the thickness of the upper layer should be at least 35-40 cm, so that watermelons can get high yield. Watermelon fertilization is mainly based on high-quality manure, supplemented by inorganic fertilizer, that is, 3 cubic meters of high-quality soil miscellaneous fertilizer, 75 kilograms of nitrogen, phosphorus and potassium compound fertilizer, and cake fertilizer 100 kilograms per mu. Fertilization method: half of the base fertilizer is spread and half is applied in furrow, and the top dressing is mainly point application. When applying fertilizer, some chemicals can be applied at the same time to prevent and control diseases. 70% of Dixon powder and 2-3kg of phoxim granules can be applied.

2. Land consolidation and border preparation

Before watermelon planting 15 days, soil should be built and moisturized before lifting in the border. It is best to cultivate watermelon in greenhouse in two rows, one row of 90 cm and the other row of 40 cm, as a small high embankment with a width of 30 cm and a height of 15 cm. The border is ready, covered with plastic film for planting. In greenhouse cultivation, plastic greenhouses can be built before soil preparation. The inner diameter of the greenhouse is not less than 6.5 meters, the height of the greenhouse is not less than 65438 0.6 meters, the width of the small arch shed in the middle of the greenhouse is 2.2 meters, and the height of the arch is 0. 7 meters, and the thickness of the straw cover is not less than 5 cm. 6-7 days before greenhouse planting, trim the border and cover it with plastic film for planting.

3, planting time and method

The planting time of watermelon in greenhouse is March10-March 20th, and small and medium-sized watermelon in greenhouse can be postponed by 10- 15 days, and watermelon in solar greenhouse can be advanced by 5-7 days. The planting method is based on the whole ridge, and holes are opened according to the predetermined plant spacing, and the plant spacing is 50 cm. There are 900 watermelons per mu in greenhouses and small and medium-sized greenhouses. The planting density in solar greenhouse can be increased to more than 1500 plants.

When planting, pour enough planting water at one time. On the day of planting, don't cover all the soil in the planting hole, just cover half of it, and then cover it after 2-3 days in the sun to raise the temperature in the hole and promote rooting.

4. Do a good job in field management to ensure high yield and early listing.

Management should be strengthened after watermelon planting in protected areas in early spring, with emphasis on temperature, humidity, fertilizer and water, and flower and fruit protection.

1, temperature (1), humidity should be 32-33℃ in the daytime, not higher than 35℃, and the soil temperature should be above 18℃ within 3-5 days before slow seedling, so as to promote slow seedling. (2) After delaying the emergence of seedlings, the temperature should be appropriately lowered to 25-30℃ during the day, not lower than 15℃ at night, and ventilated when it exceeds 30℃ during the day. (3) After the watermelon blooms, the temperature can be raised appropriately, which is 28-32℃ during the day and not lower than 15- 18℃ at night, and the temperature difference between day and night is 10- 15℃.

2. Humidity The growth of watermelon stems and leaves requires low air humidity, the relative humidity is about 60%, and it requires 70-75% when flowering and pollination. Therefore, it is required to cover with plastic film, on the one hand, to reduce soil moisture evaporation, on the other hand, to ventilate; Ventilation should be provided after each watering to reduce humidity.

3. Pruning melons and watermelons in the artificial pollination shed is pruned with two vines, that is, one vine is left on one side of the main vine, and melons are mainly produced by the main vine method. The first melon stays between nodes 12- 14. The second melon stays between 20-22 leaves. After the melon leaves, the small lateral vines in front of the melon are no longer removed. The artificial pollination time is 9- 10 in the morning. Pollen of the male flower that opens on the same day is smeared on the stigma of the female flower that opens on the same day. Color-code after pollination to remember the pollination time and facilitate later harvesting. Disease-resistant Sumi watermelon can be harvested 30-32 days after flowering and pollination.

4. Fertilizer and water management The fertilization of watermelon in greenhouse should not only consider the characteristics of watermelon plants' fertilizer demand and absorption, but also consider the changes of nutrients and the characteristics of plant growth in greenhouse.

The absorption of nitrogen, phosphorus and potassium by watermelon at different growth stages is different. According to the determination, the absorption at seedling stage accounts for 0.065438 0% of the whole growth period, 0.54% at seedling stage, 65438 04.6% at flowering stage and 84.85% at fruiting stage. (The absorption of fruit is the largest in the fruit expansion period, accounting for about 77.5%), so the principle of fertilization should also be based on the absorption of fertilizer by watermelon in different periods. After planting, it is usually chased three times. After the first seedling delay, it is called seedling fertilizer, and each point is 0. 3%-0.5% urea solution 1 kg. For the second time, when the vines are about 30 cm long, topdressing decomposed cake fertilizer or ternary compound fertilizer is 5-8 kg per mu, and for the third time, topdressing ternary compound fertilizer is 30 kg per mu and potassium sulfate 10- 15 kg. Foliar fertilizer should be applied 1-2 times during fruit expansion, and 0.3%-0.4% potassium dihydrogen phosphate and 0.4% urea solution can be sprayed.

The principle of watermelon watering is "tight first and then loose" > >

Question 8: Introduction of watermelon planting time. When is the best time to grow watermelon? The sowing date is generally determined according to the variety type, cultivation purpose and market date. Generally speaking, some early-maturing varieties should be planted in mid-March and listed in mid-July; Late-maturing varieties can be delayed until the middle and late April, and harvested from late July to early August; Planting in the open field after autumn is suitable for sowing from late June to mid-July and harvesting from September to 10; Autumn greenhouse cultivation is generally sown from late July to early August and listed after the National Day.

Question 9: Watermelon planting time Watermelon is generally planted in the middle and late March, planted in the middle and late April, and harvested in the late June; Watermelon in autumn is sown in the first half of July and harvested in late September.

Watermelon cultivation in the open field is cultivation without protective equipment. Generally, when the local final frost has passed and the ground temperature is stable at about 65438 05℃, the suitable time for sowing in the open field is. The best sowing date should also be determined according to the variety, cultivation season, cultivation method and edible season. Generally, it is sown in the middle and late March, sown in the middle and late April, and harvested in the late June. Watermelon in autumn is sown in the first half of July and harvested in late September.

Question 10: On what land is it better to grow watermelons? land

Watermelon has low requirements on soil, and is drought-resistant and barren-resistant. But because the root system of watermelon is aerobic, it needs enough soil air. Suitable for loam or sandy loam with good drainage and deep soil layer. Good ventilation, rapid water infiltration after rainfall or irrigation, rapid ground temperature recovery in early spring, rapid heat dissipation at night, large temperature difference between day and night, robust seedling growth, high fruit sugar accumulation and good quality. However, the sandy land is generally barren, with rapid fertilizer decomposition and nutrient consumption loss, and the phenomenon of fertilizer removal often occurs in the later stage of plant growth, with weak growth potential and easy aging and disease. Therefore, reasonable fertilization is the key measure to increase production in sandy land. Newly reclaimed raw wasteland and clay land have poor ventilation, low ground temperature, slow seedling development, late fruit ripening and poor quality. However, the plants are not prone to premature aging, and the vine leaves last for a long time, which is suitable for mid-late maturing varieties and multi-fruit cultivation methods. If we strengthen the management of temperature, fertilizer and water, we can also achieve high quality and high yield.

Watermelon is suitable for neutral soil, but it has wide adaptability to soil pH and can grow normally in the range of pH 5 ~ 7. Watermelon is sensitive to saline-alkali, and it can't grow normally when the soil salt content is higher than 0.2%. In addition, the soil is too sticky, the groundwater level is too high, and the plots and continuous cropping areas with low terrain and easy water accumulation are not suitable for growing watermelons.