1、 Watermelon 8424

Watermelon 8424 refers to ZAOJIA 8424, a variety of watermelon. It is the 24th group of improved varieties successfully bred by former agricultural experts in Nanhui District of Shanghai on February 4, 1984, so it is named. Because of its thin and juicy skin, sweet and refreshing taste and moderate size, it is deeply loved by people. The development of pure 8424 fruit is about 30 days. A single melon generally weighs 8-14 kg, and the central sugar degree is between 12-14 degrees

2、 Planting techniques of watermelon 8424 in Greenhouse

1. Planting site selection: it is best to choose fertile sandy soil with high and dry terrain, deep soil layer, good permeability and convenient drainage and irrigation. In addition, it should be noted that the planting place should not be the place where melon and eggplant crops have been planted within 3 years. Try to select crops with corn, rice, rape, cotton and other crops as the planting land

2. Land preparation and shed construction: first, in the late autumn and early winter of the year before sowing, remove weeds and dead leaves in the field and turn them 25-30cm deep. Secondly, when the soil is dry and wet and easy to be broken, level and fine tillage shall be carried out, and ditches shall be dug. According to the size of the greenhouse, it is planned to make borders and open ditches for drainage. The best way to build a greenhouse is to use staggered arrangement and symmetrical construction. Finally, after the greenhouse is built, fertilize and prepare the land for border. When the soil is dry and wet, cover the plastic film and wait for planting melons in the hole, and lay another dropper belt along the position of planting melons in the hole

3. Seeding and seedling raising: in order to cultivate high-quality seedlings, electric heating can be used to raise seedlings. The germination temperature of watermelon is 28-30 ℃, and the soil temperature needs to be kept at 25-30 ℃ for 3-4 days after sowing. The heating of seeds shall be suspended after breaking the soil. Wait until the seed breaks the film before putting the seedlings. After most of the melon seedlings are unearthed, the gap heating method can be adopted. The temperature is controlled at 20-25 ℃ during the day and 15-20 ℃ at night

4. Colonization: the first is to refine seedlings. At this time, stop heating, gradually open the shed opening, expand the ventilation range and prolong the ventilation time. It should be noted that the ventilation should not be too fierce. The melon seedlings with the seedling age of about 30 days and 3-4 real leaves after seedling refining shall be colonized from 9:00 to 16:00 on a sunny day or at a temperature of about 10 degrees. Do not water after planting

5. Water and fertilizer management: different water and fertilizer management shall be carried out according to watermelon in different growth stages. The fertilization principle is mainly adjusted according to soil fertility, target yield and plant growth, but do not apply nitrate nitrogen fertilizer, hospital fecal waste and urban waste. Water management should be adjusted according to the growth stage of watermelon

6. Temperature and humidity Management: according to the humidity inside and outside the greenhouse and weather conditions, make corresponding adjustments in time. If the temperature in the shed needs to reach 30-35 degrees at the initial stage of planting. When the plant survives, the temperature during the day is 30 degrees and the temperature at night is 15 degrees

3、 How much is the yield of watermelon per mu

The yield per mu of watermelon will vary according to the variety, mode and season of cultivation. Generally, under normal management conditions, the yield of watermelon per mu is between 4000-10000 kg