Sweet potato seedbed management techniques remember 5 items
There are many types of sweet potato seedbeds, and different management requirements for heating methods are also different. However, to achieve early, full, and strong objectives, the management key of “early high-temperature germination, disease prevention, medium temperature long seedlings, and late low temperature seedlings†must be adopted. Techniques. First, the scientific distribution of sweet potato buds from the distribution of the most part of the potato, followed by the middle, the least tail, so when the seedlings flat or oblique rows of potato, should pay attention to the potato head up, tail down, back up With the abdomen facing down, this will increase the number of sprouts. If the large and small potato varieties are arranged on the same seedbed, they should be ranked in the middle because of the slow emergence of large fries, long seedlings, and strong potato seedlings; and the small fries should germinate quickly and have long seedlings and should be on both sides. The large potato block should be deep row and dense row, and the small potato block should be thin row and shallow row. After the planting of the potato vines is completed, the manure and livestock waste water should be dripping on the potato stalks, and then covered with fine soil. It is advisable that the soil thickness be such that the potato stalks are not seen. Second, the early high temperature germination, disease prevention 1. Seed management before seedling emergence. In order to achieve the purpose of germination and disease prevention, the temperature of the potato bed should be maintained at 32-35°C. This period is the highest temperature in the nursery process, so it is called the high temperature germination stage. Before the seed potato goes to bed, the seed temperature should be increased to about 30°C, and the seed temperature should be raised to 35°C after seeding, and it should be kept within the range of 32-35°C until emergence. Management at this stage is mainly to increase temperature and keep warm. The hot material hotbed is the heat generated by the brewing material to increase the bed temperature. Cover the plastic film and remove the straw curtain to increase the temperature of the bed during the daytime and cover the straw curtain at 4 pm. The three-channel ditch is heated mainly by the fire, and the seed potatoes continue to be burned after the eaves. The bed temperature at the ceasefire is determined by the fire at the time of firing. The fire burned at 30-32°C to stop the fire, seal the furnace, and seal the chimney; the fire was not prosperous at about 35°C, and the fire was stopped, the furnace was sealed, and the chimney was closed. After the temperature rises, the temperature rises to 35-37°C (the highest point temperature). When the temperature dropped to 30 °C, and then burn the second fire, the fire generally burned one day, the cease-fire sealing furnace so that the temperature of the maximum point of the temperature does not exceed 35 °C. After emergence, the temperature dropped to about 28°C and the third fire was fired. This time, the fire did not usually burn one day, so that the temperature did not exceed 32°C. If the temperature is too low, heat preservation should be strengthened. If the temperature is too high, ventilation holes should be opened to ventilate. 2. Management of seed potatoes after going to bed. The seed potatoes should be poured into the bottom water once they go to bed, and the bed soil should be soaked. Watering is not required before emergence. If the humidity of the bed soil is too small, a small amount of water may be poured at the time of emergence to facilitate seedling emergence. Too much watering can affect the microbiological activity of the mash-heating hotbed, resulting in less heat generation, increasing the firing time for the three-channel fire pit, and wasting fuel. In this period, it should be noted that the pre-emergence seed potato “pop flower†period can not generally be watered, because the popcorn itself is a wound, when the watering can easily cause the spread of the disease. Third, the mid-term temperature long seedlings after emergence to the pre-planting seedlings is a critical period for the cultivation of sweet potato seedlings, to master the relationship between water, temperature, light and gas. In the initial stage of emergence, it is still mainly reminded that the bed temperature is maintained at 28-30°C, and the bed temperature of the seedlings is reduced to about 25°C, so that the potato seedlings can grow steadily at a relatively low temperature condition, which is called "urging in refining." The amount of watering should be determined by the size of the potato seedlings and the dryness and wetness of the bed soil, which is generally maintained at 70%-80% of the maximum water holding capacity of the soil. Bed soil moisture is low, potato seedlings grow slowly, easy to age; high humidity, potato seedlings grow fast and young, can not be bred seedlings. During this period, the temperature in the bed has a great influence on the growth of the potato seedlings. Low temperature of the potato seedlings grows slowly, affecting early planting at the right time; long-term temperature at 32 °C, the growth of the potato seedlings is fast and weak, and in the case of relatively high humidity, adventitious roots occur on the stem and knots on the sand surface, affecting the tuber after planting. Respiration increased when the temperature exceeded 35°C, and photosynthesis decreased. If the temperature is too high, vent holes should be used or the heat dissipation of the film should be lifted to ensure the robust growth of the potato seedlings. General indoor air temperature is in the range of 22-25°C, suitable for raising strong seedlings. Vents can not only regulate the temperature and humidity, but also replace the air, so that the air inside the film is fresh, and the growth of potato seedlings is favorable. In the rainy days, the temperature should be strengthened. In addition to covering the films and straw curtains, it is best to cover the straw with a layer of film to prevent the rain from seeping into the bed and reduce the temperature of the bed. Sandaogou fire pot should be warmed up to raise the temperature inside the bed. Plastic film fire pits and hotbeds when the potato seedlings just exposed sand surface, the seedlings are young, should pay attention to high temperature burning potato seedlings. Fourth, the late low temperature hardening seedlings. "Qingmiao" is to allow sweet potato seedlings to undergo exercise under natural light and temperature conditions, to improve their adaptability to the natural conditions in the field, and is an important part of improving the survival rate. The focus of management is to pour water 5 to 6 days before ploughing, and water is generally not used afterwards. Before 2-3 days, the bed temperature dropped to about 20°C, similar to the temperature in the field, and the seedlings were cultivated at low temperature. At the same time, the film was removed on sunny days to allow the upper seedlings to receive natural light exercises, and the lower seedlings were grown under low light, that is, the large seedlings were exercised and the seedlings continued to grow. Fifth, continue to strengthen the management of seedbeds after the emergence of seedlings. To grow potato shoots to a certain height, they must be planted in a timely manner to prevent them from being crowded and crowded in order to facilitate timely planting. Seedlings will inflict damage on seed potatoes and are easily infected by pathogens. Therefore, after watering, the seedlings will not be watered on the same day to facilitate the healing of the wound. After the seedlings are picked up, the hotbed for covering the plastic film should immediately cover the film to warm up and cover the straw insulation at night. After the potato seedlings have grown to a certain degree, they gradually cool the seedlings. After the management with the former. Disposable Procedure Kits,Disposable Debridement Packs,Disposable Debridement Kits,Disposable Debridement Bags Suzhou JaneE Medical Technology Co., Ltd. , https://www.janeemedical.com