First, seedbed preparation
The nursery bed should be built on a leeward sunny side, where the terrain is relatively high and dry, and east to east is appropriate. The seedbed is generally 1.2 inches wide, 8 to 10 meters long and 10 to 15 meters deep. Fertilizer soil after sifting pasture soil (not planted melons) 70% plus sifted 30% of farmyard manure, 0.25 to 0.5 kg of urea per cubic nutrient soil, 0.15 kg of diammonium , Carbendazim 100 grams, mixed evenly, with nutrients (diameter 8 ~ 10 cm) or nutritious soil blocks seedlings, fill with nutritious soil between the day, the seedbed should be soaked in the bottom water 1 to 2 days before sowing. And buckled a small arch to warm up.
Second, soaking germination
The seeds were first air-dried for 2 to 3 days, and they were soaked with 55 to 60°C warm water (two times a cold). The stirring was continued. The water temperature was lowered to room temperature, and the warm water had both the function of soaking and sterilization. Remove the soaked seeds and rinse them to remove the mucus on the surface of the seeds so that the seeds do not slip.
The soaked and washed seeds are placed between the upper and lower incisors as if they were seeds, and they can be heard by clicking gently. Put the squeezing seeds evenly on a warm towel. It is advisable that the seeds do not press each other, fold up on all four sides, roll up from the top, and roll them into a towel roll. Place the towel roll in a thermostatic chamber at 33-35°C to germinate. Note: Towels should use clean towels, humidity should not be too large. It is advisable to wring out the water with a towel and the temperature must be constant. Most of the germination occurred after 24 hours. The sprouts are picked and prepared for broadcast. The bud length is preferably 0.2-0.3 cm. Wash the towel, continue to germinate the remaining seeds, pay attention to the remaining seeds do not wash with water. Seeds that did not germinate 48 hours after germination had lost their viability and no need to germinate.
Third, sowing and seedling management
Seedless watermelons are suitable for planting when the seedling age is about 30 days and the seedlings have 2 to 3 true leaves. Therefore, seedlings should be planted about 30 days before planting. To select the sunny morning sowing, soak the small holes 0.5 to 1 cm in the center of each nutrient bowl with a thin stick, and put the germinating seed buds down into the small holes and lay it flat, and then cover it with a thickness of 1 cm. Fine soil was sieved, and after seeding, the surface of the seedbed was covered with a layer of plastic film, and a small arch shed was buckled.
After sowing, high temperature should be maintained before emergence. During the daytime, the temperature should be above 28°C, and the maximum temperature is 35°C. At night, the temperature should be 22-25°C to facilitate seedling emergence. When 50% to 70% of the soil is exposed, the bed mulch film is promptly sprinkled. Two cotyledons after the micro-exhibition to reduce the temperature, during the day 23 ~ 25 °C, 15 ~ 20 °C at night, to prevent the formation of tall seedlings; the first true leaf to expand the week before planting, during the day 28 ~ 30 °C, night 20 ~ 23 °C, one week before planting began to increase ventilation and hardening seedlings.
Seedless watermelon with unearthed shell phenomenon more, when the seedlings unearthed 50% to 70%, in the warm sunny morning unveil the film "cap", every 1 to 2 days once, until all removed. Care should be taken when removing the cap: Avoid doing it at high temperatures and temperatures below 15°C. If the shell is dry and hard, spray a little water first to make the shell soft and soft. After the seedlings, the seedlings are cultivated once.
IV. Planting and field management
Mushi high-quality farmyard fertilizer 3 to 5 square, urea 20 to 30 kilograms, diammonium 20 to 30 kilograms, potassium sulfate 20 kilograms, fine soil preparation, row spacing 1.7 to 2 meters to do hoe, high ridge cultivation, high ridge width 60 About centimeters, about 15 centimeters high, covering 80 to 90 centimeters wide film, select the windless sunny planting, acres planting 500 to 700, with the plant with watering. Three vines pruning, leaving the main ranch 3 female flowers to set the best, to avoid low-section sitting melon.
Seedless watermelon is artificially assisted and pollinated. It has a strong purpose, and fruit setting is early and neat, and fruit ripening is relatively consistent. It is one of the key technologies for increasing yield. Around 8 am, male flowers pollinated in the same day are used to pollinate female flowers of seedless watermelon. The timing of pollination after flowering is as early as possible, and no later than 10 o'clock. One male and one male flower can grant 3 to 4 female flowers. The pollination should be uniform and the movement should be light to avoid hurting the stigma.
Seedling stage (before and after the mission) 5 kg urea per acre topdressing to promote seedling growth, flowering fruiting period is generally not water, no fertilizer; watermelon, such as the size of duck when the melon has basically stable, topdressing once swollen fertilizer, mu The recovery of 15-20 kg of urea, 15 kg of potassium sulfate, spraying 0.2% potassium dihydrogen phosphate in the late growth stage, can increase production and quality.
When watermelons are sold locally, they can be grown and harvested appropriately, and the long-distance sales of the eight mature harvests.