Various tree species have their own physiological characteristics. In winter, different storage methods are used to ensure the germination rate. First, the dry method. Sealed dry and ordinary dry storage of two kinds. Poplar, willow, and eucalyptus tree species tend to lose their germination power, and they are sealed and dry. Specifically, the dried seeds are placed in a sterilized glass or porcelain bottle, and the mouth of the vessel is sealed with wax, so that the seeds are isolated from the outside air. The tree species of pine, cypress, mulberry, acacia and paulownia are very low in metabolic capacity. After drying, they can generally meet the storage moisture standard. These species can be stored by ordinary dry storage methods. The specific approach is: After the seeds are fully dried, they are put into linen bags or barrels and cabinets and placed in cellars or indoors to maintain a temperature of 0.5°C and a relative humidity of 50% to 60%. Second, the wet method, chestnut, ginkgo, apple, The tree species of pepper and eucalyptus are not easy to germinate in the following year due to their high standard water content, such as dry storage method. It can be stored in a cool, humid place, instead of seed treatment before sowing. Direct seeding can produce seedlings. The commonly used wet methods include pit storage and heaping. The specific practice of the pit is to choose a dry, well-drained site with a high topography, dig a pit with a depth of 0.8m, an area of ​​1m2, and cover the rough sand in the bottom of the pit. Mix the seed and fine sand in a ratio of 1:3. Fill it evenly in the pit, fill it up to 10 cm away from the pit, cover it with sand, and put a few straw handles in the pit for courage. The temperature in the pit is maintained at 0-3°C, and the moisture content in the sandy soil is maintained at 70%-80%. Stacking can be done outdoors or indoors. The practice of indoor stacking is to choose a place where air circulation cannot reach the sun's surface, and when the ground is covered with a layer of sand to a height of 33-37 cm, it is covered with fine sand. Several straws should be inserted on the heap for ventilation. Place a cover over the seed pile to prevent rain and livestock. China Agricultural Network Editor
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