First, choose a good seedbed: Select leeward sunny, flat terrain, fertile soil, rich in organic matter, and drainage and irrigation facilities, convenient transportation to do seedbeds. Carbendazim should be used for sterilizing and sterilizing strictly before cuttings to avoid transmission of diseases. The ratio of seedbeds to fields should be implemented as 1:10 for seedbed area. Second, the application of basal fertilizer: cuttings per acre the previous week, planting water manure 15-20 million or 45% compound fertilizer 20-25 kg, and then the entire seedbed, through the entire office to fully mix the fertilizer to avoid fertilizer injury, Affect sweet potato rooting. Third, the fine soil preparation: the field of sweet potato seedlings require a plough and a flat surface. And high-pitched car for a good ditch, car width 1.5m, car depth 30cm, width 20cm, box length of 10m or so. Fourth, the timely row of potatoes: greenhouse (or double membrane) scheduling time should be selected in mid-February sunny days, the car face every 20cm ditch pouring sole water, and then draining seeds in the ditch, scheduling requirements head and tail Sloping down, separate large and small potatoes, and keep them on top of each other to ensure that the seedlings are neat and tidy. About 10kg per square meter row, small potatoes (150g each), 60-70 per square meter row of seed potatoes, medium-sized potatoes (about 250g per square meter) 40-50 per square meter. After the seeds are planted, the cover is finely grounded and covered with micro-membrane. The surface of the car is covered with micro-membrane. Fifth, seedbed management 1, the correct temperature control: the film temperature control between 25 - 30 degrees. Between 10 am and 2 pm on a sunny day, pay attention to changes in the temperature of the membrane space. Because this time is a high temperature period in the film, it may hurt the seedlings. After temperature measurement, according to the appropriate temperature in different periods, take corresponding measures for increasing temperature, keeping warm or cooling. The nursery period should focus on controlling the temperature. The temperature control during the nursery period can be divided into three stages: early high-temperature germination, medium-term flat temperature long seedlings, and late low-temperature hardening seedlings. Before the potato shoots are unearthed, they are predominantly promoted. The temperature in the membrane does not exceed 35°C. Generally, the temperature is not ventilated. From the time that the potato seedlings are extracted until the seedlings are harvested, the temperature is appropriately reduced. The temperature in the pre-stage is not lower than 30°C. Below 25 °C, timely tempering. In the close vicinity of Daejeon, 7-10 days before planting, the temperature of the seedbed was lowered to atmospheric temperature, heating was stopped, and the film hardening seedlings were opened overnight. The potato seedlings were able to adapt to natural conditions under natural conditions, so that the potato seedlings were old and healthy. 2. Scientific watering: Generally, watering or watering is not required before emergence. Once the seedlings are sprayed, water is poured once and immediately after picking the seedlings. Mastering the seedling-seeding period, no watering before picking seedlings, no shortage of water during the high-temperature period, low-temperature water for seedling cultivation, keeping the bed dry, wet and dry, and drying on wet and dry. Low temperature watering time is selected in the morning, and high temperature watering is selected in the morning and evening. 3, timely fertilizer: combined with watering time and time to top-dressing, topdressing with nitrogen fertilizer, such as water manure or urea water, fertilization must pay attention to the concentration, control at about 0.5-1%, as far as possible to apply multiple times, is strictly prohibited Apply urea and cast water to prevent “burning†the seedlings. If the recovery of urea, each 3-4 kg of water per acre is appropriate for 500-800 kg. 4. Collecting seedlings in batches: When the potato seedlings grow to 25 cm in height, cut the seedlings to the field (or nursery) in time. If the seedlings are not picked in time, the potato seedlings are crowded, and the seedlings below the seedlings are difficult to grow normally, which will reduce the number of seedlings. At the same time as early as possible to promote the high yield of sweet potato. Gauze Balls,Cotton Gauze Balls,Absorbent Gauze Balls,Disposible Gauze Ball Zhende Medical Co.,Ltd , https://www.zdmedicalproduct.com