Jiaxing local watermelon planting time?

Jiaxing local watermelon planting time is different according to the open field and greenhouse planting time. Sow in the open field from late May to early June, and shed about 1 month.

Analysis:

Jiaxing city is a shallow dish-shaped depression near Taihu Lake, and its terrain inclines from southeast to northwest. Due to thousands of years of human reclamation and development, the plain is divided by criss-crossing Tangpu Canal, and fields, land and water are interlaced, forming a three-dimensional topographic structure of "six fields, one water and three points". Mulberry is planted in dry land, grain is grown in paddy field, fish is raised in lakes, artificial landform is obvious, and water town features are rich.

Jiaxing City is located in the southern edge of the northern subtropical zone, belonging to the East Asian monsoon region, with alternating winter and summer monsoon, four distinct seasons, moderate temperature, abundant rain and sunshine, with the characteristics of wet in spring, hot in summer, dry in autumn and cold in winter. Because of its mid-latitude, the hot and humid weather in summer is much shorter than the dry and cold weather in winter. Annual average temperature 15.9 degrees Celsius. The average annual precipitation is 1 168.6 mm. The annual average sunshine time is 20 17.0 hours.

Watermelon likes warm and dry climate and is not cold-resistant. The optimum temperature for growth and development is 24-30 degrees, the optimum temperature for root growth and development is 30-32 degrees, and the lowest temperature for root hair generation is 14 degrees. Watermelon needs a large temperature difference between day and night in the process of growth and development, and a large temperature difference between day and night can cultivate high-quality watermelon.

Under natural circumstances, Jiaxing can be cultivated in the open field around mid-May, and listed in the greenhouse in advance. According to the local climate, seedlings can be raised around 1 month.

Watermelon cultivation time:

First, the cultivation time in the open field

Spring stubble planted after late frost includes seedling transplanting, bud transplanting and direct seeding.

Sow summer stubble in Huang-Huai-Hai region from late May to early June, and harvest in the middle and late August.

In autumn stubble, in the Huang-Huai-Hai region, seedlings are planted in the first half of July, sown in the second half of July and harvested in the second half of September.

Cultivation time of watermelon in protected field:

First, early spring stubble

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. Seedling transplanting can make full use of protection facilities and 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.

Second, early spring cultivation.

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, sowing is usually around the end of June 1, in the first half of March, harvesting the first crop of melons in the first half of May and harvesting the second crop in the first half of June.

Third, 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.

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.

Fourth, winter and spring stubble

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.

Seeding and seedling raising method:

Preparation of nutrient soil: There are many methods to prepare nutrient soil. Usually, 2/3 peat soil is mixed with 1/3 seedless melons and screened field soil, or 1/3 decomposed farmyard manure and 2/3 field soil. Add 2 kg of calcium superphosphate to each soil, disinfect with 800 times carbendazim solution, or fumigate with formaldehyde.

Soaking seeds to accelerate germination: soak the seeds in warm water at 55℃ for disinfection and keep stirring until the water temperature drops to about 30℃. After soaking for 4 hours, wash the seeds, then wrap them in a wet towel and put them in an environment of about 30℃ to accelerate germination.

Sowing: The day before sowing, the seedling soil should be thoroughly watered with 800 times of thiophanate methyl solution. When the seed buds grow to about 0.5cm, plant the seeds into the seedling tray with the buds facing upwards, cover with fine nutrient soil with a thickness of 65438±0.5cm, and thoroughly irrigate the seedling tray with 800 times of methyl thiophanate solution, and keep the temperature at 25 ~ 30℃ to ensure the orderly emergence of seedlings.

After emergence, the temperature should be kept at 65438 08 ~ 28℃. The seedbed would rather be dry than wet. In early spring, it is necessary to prevent freezing injury and ensure sufficient light. In summer, seedlings should be prevented from growing in vain at high temperature.

Training points:

Watermelon planting should choose plots with loose soil, deep soil layer, fertile soil, good drainage and plenty of sunshine, and bask in the sun in the west; Watermelon field is not suitable for continuous cropping, and it is usually rotated once every 4~5 years, otherwise the blight will be serious.

Gramineae crops such as rice and corn are the best, followed by vegetable crops such as potatoes and Chinese cabbage. However, watermelon, as a melon vegetable, has serious diseases and is not suitable for selection.

Gua Tian must plough deeply, preferably in winter.

In the plot with deep ploughing or deep ploughing, furrows are dug around, and the furrows are covered according to the tillage row spacing of 2.4-3.0m (the furrow width is 0.5m). One side of the border is furrowed and applied with base fertilizer, and 2500-3000kg of farmyard manure is applied per mu, with phosphate fertilizer15-20kg and 45% compound fertilizer of 20-20kg added.

In order to prevent underground pests, a small amount of crystal trichlorfon can be mixed into the base fertilizer.

Cover the base fertilizer ditch, make melon ridges and finally cover them with plastic film, waiting for sowing or transplanting.

When opening the compartment, pay attention to that the compartment line is perpendicular to the direction of spring and Xia Feng. First, apply base fertilizer to the compartment surface blown in by the wind, so that the melon vines will be consistent with the wind direction after planting.