Watermelon 8424 refers to Zaojia 8424, a variety of watermelon.It is February 4, 1984, the original Nanhui District of Shanghai agricultural experts breeding success of the 24th group of improved varieties, hence the name.Because of its thin and juicy skin, sweet and refreshing taste, moderate size, it is deeply loved by people.The development of pure 8424 fruit is about 30 days, the weight of a single melon is generally 8-14 kg, and the central sugar degree is between 12-14 degrees.
1. Planting land selection: It is better 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 area should not be selected where melon and eggplant crops have been planted within three years.As far as possible, maize, rice, rape, cotton and other crops should be selected as the planting land.
2. Land preparation and shed construction: firstly, removing weeds, dead leaves and the like in the field and deeply plowing for 25-30cm at the end of autumn and the beginning of winter of the year before sowing.Secondly, when the soil is dry and wet and easy to break, fine tillage is carried out and ditches are dug.According to the size of the greenhouse planning for furrows, ditching and drainage.The best way to build a greenhouse is to use staggered arrangement and symmetrical construction.Finally, after the greenhouse is built, fertilization and soil preparation are carried out.When the soil is dry and wet properly, the mulching film is covered, the melon is planted by digging holes, and one dropper belt is laid along the position of the melon planted by digging holes in each furrow.
3. Sowing and seedling raising: in order to cultivate high-quality seedlings, electric heating seedling raising can be adopted.The germination temperature of that watermelon is 28-30 deg C, the soil temperature need to be kept at 25-30 deg C for 3-4 days aft sowing, and the heating is suspended aft the seeds break the soil.Aft that seeds break the membrane and then put the seedlings, after most of the melon seedlings come out of the ground, a gap heat method can be adopted, the temperature is controlled between 20 and 25 deg C in the daytime, and the temperature is kept between 15 and 20 deg C at night.
4. Planting: the first is to harden seedlings.At this time, we should stop heating, gradually open the greenhouse, expand the scope of ventilation and extend the ventilation time.It should be noted that ventilation should not be too strong.The melon seedlings with seedling age of about 30 days and 3-4 true leaves after seedling hardening are planted from 9 o'clock to 16 o'clock in sunny days or at a temperature of about 10 deg C.Do not water after planting.
5. Water and fertilizer management: according to different growth stages of watermelon, different water and fertilizer management.Fertilization principles should be adjusted according to soil fertility, target yield and plant growth, but no nitrate nitrogen fertilizer, hospital excreta and municipal garbage should be applied.Water management should be adjusted according to the growth stage of watermelon.
6. Temperature and humidity management: according to the greenhouse inside and outside humidity and weather conditions, to timely adjust accordingly.For example, the temperature in the greenhouse needs to reach 30-35 degrees in the early stage of planting.When the plants survive, the temperature is 30 degrees in the daytime and 15 degrees at night.
The yield per mu of watermelon varies with the variety, method and season of cultivation.Generally speaking, under normal management conditions, the yield of watermelon per mu is between 4000 and 10000 Jin.
