1. Warming the fire kiln in the bottom of the nursery bed dug through the hot front, connected with the stove before, and then connected with the chimney, pyrotechnic channel covering the arc, and then cover the nutrition soil 15 to 20 cm; using coal, firewood and other burning fireworks Through the passage, raise the bed soil temperature. This method is suitable for seedlings of melons and legumes with short seedlings. This kind of nursery has certain risks and is inconvenient to control and manage. 2. Warming the hotbed Warming digs a bed in the nursery bed, fills in manure, garbage, straw or other fermentable organic matter, decomposes the heat energy produced by fermentation, and raises the temperature of the seedbed soil. By adjusting the amount of filling material, change the bed temperature and maintain time. The bed temperature is higher in the early stage and the bed temperature is lower in the later period. It is often used at a stage with a higher bed temperature to speed up the emergence. However, the amount of brewing material is large and the temperature is extremely stable. 3. Electrothermal warming is a good way to increase temperature. The insulated wire is buried in a 15 to 20 cm deep soil in a greenhouse or small shed cold bed nursery bed and controlled by a controller. It can increase the temperature by 1°C per hour, and can increase the temperature by 10～15°C than the normal cooling bed. The temperature is easy to control and the precision is high. The seedlings can be unearthed quickly and evenly, with strong growth and less disease. Mainly used for melon vegetables seedlings. Medical Grade Nitrile Gloves,Nitrile Grade Medical Gloves,Medical Examination Nitrile Glove,Blue Examination Nitrile Gloves Jiangsu Yanfang Medical Technology Co.,Ltd. , https://www.yanfangmedical.com