I. Variety selection
Select high-quality, low-temperature, low-light early-maturing, high-yield watermelon varieties. For example, Royal Family, Precocious Prince, Jingxin No. 1 and so on.
Second, nursery
Use greenhouses, greenhouses, small warm pits and other facilities to raise seedlings, seedbed nutrient soil using decomposition of sifted chicken manure and pastoral soil prepared by 1:8, the soil too viscous may add some sand or sieved furnace ash, per cubic meter nursery Soil plus 1 kg of diammonium phosphate, 1 kg of potassium sulfate, pentachloronitrobenzene and thiram 100-150 g each.
Using electric wire nursery, the well-matched nutrient soil was loaded into a 10 cm nutrient bowl, neatly discharged into a seedbed, and irrigated 2 to 3 days before sowing. The water completely infiltrated the back cover mulch, and the geothermal line was opened to increase the temperature.
Seed disinfection before sowing, first soak 0.1% to 0.2% potassium permanganate solution for 30 minutes, then wash with water, put in warm water at 55°C, quickly stir to room temperature, soak for 6 to 8 hours, Put germination at 28-30°C until the seed coat is white. Generally sowing in late February, sowing 2 to 3 seeds per hole, covering 1-1.5 cm.
Third, seedling management
Seedlings were kept at 28-30°C during the day and the night temperature was maintained above 20°C. When 70-80% of the seed arched soil is removed, the ground film is removed and the ground heating line is disconnected in time. Appropriately reduce the temperature after emergence, the daytime temperature is controlled at 22°C and nighttime at 12-15°C, and the lower night temperature can prevent the occurrence of "high-legged seedlings". After the first true leaf grows, the temperature is properly increased to promote the growth of seedlings. The temperature is controlled at 25-28°C during the day and about 15°C at night. Five days prior to planting, the plants were cultivated at low temperature and gradually cooled and cooled to prepare for planting. Insecticide and bactericide were used for prevention 1 day before colonization.
Fourth, colonization
Soil fertigation, ditching, hoeing, and deep ploughing before winter, with ditching at a spacing of 2.5 meters, depth of 30 cm and width of 30 cm. Each chicken planted with 2 acres per mu, 25 kg of potassium dihydrogen phosphate, 25 kg of potassium sulfate, mixed with soil and fertilizer, and 1 meter wide, will be poured before March 20, and will be made into turtles 2 to 3 days later. Back sorghum, using 100 grams of trifluralin herbicide per acre, evenly sprayed sorghum, covered the mulch in time, and then inserted bamboo vines, take a small shed, shed height 30 to 35 cm, width 1.1 to 1.2 meters.
It is usually planted on March 25-30. The density of planting is 800-900 mu. The turtles will be hit by 60-70 centimeters on the stilts on the back of the turtle, and the two plants will be planted in each hole.
V. Post-planting management
Three days after planting, no more than 35°C in the small arch shed did not release the wind, and three days later, the side put a small wind, usually about 10 meters to put a small tuyere. After easing the seedling temperature, the temperature in the shed is maintained at about 30°C, and the planting is started for about 10 days. If the weather is mild, it is better to pour water, and the water should not overflow the mulch. When the vine grows to about 20 centimeters, weeding and weeding is repeated once in the shed to prevent the vines and vines from weaving together (open the sheds on one side and cover the small arch sheds immediately after vines are woven). At this time the shelf temperature control 25 °C ~ 28 °C the longer the better, increase the vent outlet or both sides put the string of wind, such as melon vines grow strong at night can be less off the tuyere, and even do not close the tuyere. When the local daily average temperature is 18°C, the Shijiazhuang area can be removed from the small arch shed by the end of April.
Generally three vine pruning, remove the excess lateral branches, vines climb on the ditch, in the width of the earthworms with soil pressure vines, to prevent wind stalks.
Artificial pollination generally leaves the second and third female flowers sitting on melons. Every day at 7 to 9 o'clock in the morning, the male flower that was opened on the day was taken off, and the petals of the male flower were removed. The pollen was gently and evenly applied to the female flower's style and marked after pollination.
Topdressing watering, until most watermelons grow to the size of walnuts to eggs, combined with watering Mushi urea 10 kilograms, 7 days or so pouring the second water, the size of the watermelon bowl combined with watering Mushi urea 10 kg, dihydrogen phosphate Potassium 5 kg. See watering in the ditch and water in a timely manner. Each time you pour water, avoid flooding through the film. Stop watering 5 days before picking.
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