Main cultivation and management techniques of watermelon

The shed greenhouse has less investment and high efficiency, which is a good way for farmers to get rich. The main seedling techniques are as follows:

Choose good varieties with good quality and early maturity, such as anti-disease honey, Jingxin No.1, Xinle No.7 and so on. The grafting rootstock is made of round calabash. Seedlings were incubated with a 10 cm diameter mash. The ratio of nutrient soil preparation is: 50% decomposed soil and fertilizer, 50% fertile loam (soil without watermelon, cotton and vegetables), and then sieved. Add 50% carbendazim 100g and diammonium 0.5-1kg per cubic meter of soil, mix well and then simmer, prepare 1200 nutrient mash per mu of watermelon, arrange the nutritious soil and arrange it neatly in the bed. Fill in. 3 days before sowing, the bottom water is poured, and the watermelon seeds are planted in the sand tray. The sand disc is made of wood or iron. The size is 60 cm × 100 cm × 10 cm. After the sand is boiled in boiling water, it is inside the sand tray. Spread 10 cm deep to be broadcast.

Prepare 0.5 kg of gourd seeds per acre for soaking and germination. After 5 days, sown in a nutrient bowl. Place one seed per sputum, put it back, cover the soil 1 to 1.5 cm, then cover the mulch and buckle the membrane.

Grafting uses conventional plugging. Therefore, watermelon seeds are broadcast for about 10 days later than the rootstock (cucurbit) seeds. When 80% of the gourds are unfolded, the watermelon seeds are sown in the sand tray, and the fine sand is covered with 1.5 to 2 cm thick, and the mulch film and the shed film are covered after sowing. After sowing, master the daytime 25 ° C ~ 30 ° C, night 15 ° C ~ 18 ° C, after the emergence of 20 ° C ~ 25 ° C during the day, 15 ° C ~ 18 ° C at night (grafting according to conventional methods).

Immediately after grafting, cover the small arch shed and cover the shade. In the first 3 days, only the weak light is seen in the morning and evening, and the rest of the time is shaded. Gradually increase the light time after 3 days, the principle is when the wilting is overshadowed. The relative humidity in the small arch shed is maintained at about 95% within 3 days after grafting. After 3 days, the air can be gradually released, and the air outlet is small to large, and the temperature is appropriately lowered. 7 days after grafting, 28 °C ~ 30 °C during the day, 18 °C ~ 20 °C during the night, 7 days after the day, 23 °C ~ 24 °C during the day, 18 °C ~ 20 °C during the night, the ground temperature is about 24 °C, and the night before the planting falls to 12 °C. ~ 15 ° C.

Watermelon is 30 to 35 days from flowering to maturity, and it can be harvested and marketed around May 20th.