Variety selection should choose strong growth, high yield, disease resistance, high-quality late-maturing varieties, such as King Feng Bao, Jing Long Bao, King Mi Bao and so on.
Building sheds and site preparation
1 build a shed. Select sandy loam with high topography and irrigation and drainage conditions, and conduct north-south arched greenhouse cultivation. The shed width is 6.8 to 13.6 meters, arch height is 2 meters or so, and the shed length is 40 to 50 meters. The cover film is made of 0.07 mm polyethylene without dripping film.
2 fertilization. After harvesting the former crops, plunge over 20 centimeters or more and plunge 2 or 3 times. Each 1/15 hectare (1 mu) 5000 kg of fertilizer applied to the soil, 100 kg of special fertilizer for watermelon, and 3 to 4 layers. The rice strips are applied with a width of 0.6-0.8 meters, so that the soil fertilizer is evenly mixed.
3 Tricks. After fertilizing soil preparation, the sorghum type is used, with a height of 25 centimeters, a width of 60 centimeters, and a rachis distance of 3 to 4 meters. Both sides of the raft should be shaped like a turtle or zigzag. 5 to 7 days before planting, watering on both sides of the Shuangguagou, creating foot soles to facilitate cooling and mild seedlings.
Suitable sowing and cultivation of strong seedlings
1 nursery methods. The use of shade net grafting seedlings can be nursed in the early spring watermelon seedling shed or ordinary shed.
2 seed processing. Soak the seeds with 10% trisodium phosphate solution for 10-15 minutes, remove and rinse with clean water, then soak in clean water for 3 to 4 hours, and germinate on 30% germination bed. About 0.5 cm when the shoots are sown, the live stream may be one tablet per pot, 1.5 centimeters of cover soil, and the grafted plants should be planted in seedbeds or nursery trays.
3 Grafting seedlings. The rootstock uses a gourd, grafting using the top insert method. Rootstock seeds should be seeded 5 to 7 days in advance.
4 Management after grafting. After grafting, the initial period should be cooling, shading, and moisturizing. After 4 to 7 days of grafting, the ventilation and light are gradually increased. After 7 days, ventilation can be gradually increased to reduce the sunshade. At the same time, attention should be paid to water spray, cooling, and moisturizing at noon, and pests and diseases should be promptly controlled.
Colonization
In late August, the watermelon seedling age is 30 to 35 days. Plants can be colonized with four leaves and one heart, and buckle sheds for 5 to 7 days before planting. When planting, two deep 10 to 12 cm grooves are to be opened on the sorghum. After watering, plant the seedlings at a spacing of 56 cm and 65 cm, apply a bactericide such as carbendazim, and then cover the soil and cover the silver-gray mulch, planting 600 to 700 plants per 1/15 ha.
Scientific management
1 temperature management. After planting, the shade should be properly shaded in the early stage of growth. The sunshade should be removed gradually, kept at 28-32°C during the day and higher than 15°C at night.
2 fertilizer and water management. Early control of fertilizer, pay attention to drainage after the rain, generally do not top-dressing. The results of fertilizer and water tight, after 5 to 7 days after the melon to recover a fertilizer, every 1/15 hectares of watermelon special fertilizer 25 to 40 kg, 10 to 15 kg of urea. Foliar can also be sprayed with nutrient solution and sprayed once every 10 days.
3 using three vine close-type pruning method.
4 auxiliary pollination. The second and third male flowers were selected as the main cultivars, and artificial pollination was conducted at 7 to 9 o'clock in the morning on the day of opening.
5 Pest control. The main pests and diseases include aphids, red spiders, virus diseases, blight, diseases and anthrax. Aphids can be covered with silver gray film repellent, chemical control can use 2000 times liquid spray of nicotine. Red spiders mainly use liquid sprays such as scorpion net, and they spray once every 8 to 10 days. Virus disease should be mainly prevention, and pay attention to reduce wound infections, while controlling aphids at the same time with pharmaceutical agents for prevention and treatment. Wilt disease is controlled by grafting seedlings. After the occurrence of anthrax, in addition to the use of fungicides such as thiophanate-methyl, chlorothalonil smoke agents can be used to treat the disease.
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