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(2) Soil preparation Fertilizer watermelon must be under the greenhouse shelf. The former shall be ploughed, flattened, ditched, smashed, required to be filled with dry energy, and the ridges shall be drained. The width of the rake shall be 2.5 to 3.0 meters, and the width of the groove shall be 35 centimeters. , Watermelon nutrient groove width 50 cm, depth 40 cm, will be decomposed organic fertilizer such as pig manure, large fecal dry weight of 3,000 kg per 667 square meters applied to the nutrition ditch, and then add 75 kg of NPK fertilizer, fertilizer to use soil mix Look at it, and then cover it with a nutrient ditch. Apply some fertilizer on the melon pods. For example, apply 1500 kg per 667 m2 of soil and fertilizer and spread it in the soil. This is because the adventitious roots on the watermelon vines can also absorb nutrients. For watermelon growth needs.
(3) Colonization of autumn watermelon should be planted at the end of August and early September. Plant 800 lines per 667 square meters, planted on top of the nutrient zone, must be removed when planting, the depth should be slightly deeper than the original nutrient soil, immediately after planting Foot water, the surface to spray watermelon insensitive herbicide, such as Dore, with 100 ml per 667 square meters, 50 kg of water evenly sprayed on the surface. Then cover the film. In order to prevent the danger of heavy rain, the top film of the greenhouse must be pulled immediately after planting.
(4) Suitable temperature for post-planting management of watermelon growth is 25～30°C. When temperature is low, it grows slowly; when temperature is high, it is easy to induce virus disease. It is required that the minimum temperature at night should not be lower than 18°C, and the maximum temperature during the day should not exceed 32°C. From late August to early September, the temperature at night is already low, and the nighttime film is closed around the greenhouse. Every morning at 8 o'clock on sunny days, ventilation is lifted. At 4 o'clock in the afternoon, both sides of the greenhouse are closed. After the temperature is getting lower and lower, the ventilation time for membrane removal in the morning should be postponed, and the closing time in the afternoon should be gradually advanced. After 1 week of general colonization, the vines were thrown and double-vine twigs were taken. After flowering, the watermelon must be pollinated artificially because no insects were pollinated in the shed. Pollination must be carried out between 6 a.m. and 10 a.m. It is better to choose the second female flower sitting in the melon. After sitting, you must use your fingers to pinch the vine head to facilitate the transfer of nutrients to the melon. When the melon enlarges to about 1 kilogram, it is necessary to carry out the parallel melon. The length of the melon should be fixed when setting the vertical shape. Melon, melon 6 to 7 when mature, to be melon. In the growing process of the field, it is necessary to chase the fertilizer 2 times (extension vinegar, swelling manure) and water 2 times.
(5) Harvesting generally takes 40 days after ripening melons to ripen, which is 10 days later than that of bare-streaked vegetables. Autumn watermelon is more resistant to storage, immediately after picking room temperature storage at room temperature, can put 15 to 20 days.
Cultivation Techniques of Autumn Watermelon
(1) Seedlings are raised immediately after the beginning of autumn. The latest is no later than August 15. Because the nursery is late, the planting period and the melon period must be delayed, which is not conducive to the maturity of the melon. Before sowing, the seed of watermelon is first soaked (because the temperature is suitable). Then cover the mulch and pull on the rainproof membrane and the shade net. The rainproof membrane must use a new plastic membrane. The shade net is covered at 8 o'clock in the morning on the sunny day, and the shade net is uncovered at 4 o'clock in the afternoon, and the shade net is not covered in the rainy days. Seedling disease is mainly blight and damping-off disease. Chlorothalonil can be used 600 times liquid plus mancozeb 1000 times mixed spray, spray 5 to 7 days, and even spray 2 or 3 times. At the seedling stage, there are larvae, diamondback moths, and noctuid moths, which can be used to prevent and control 1500-fold mixture of dimethoate and stuck gram. The seedling age is 20 to 25 days. When there are 3 leaves and 1 heart, they can be transplanted and planted.