Various tree species have their own physiological characteristics. In winter, different storage methods are used to ensure the germination rate.
Dry storage method is divided into two types: sealed and dry. 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, placed in the cellar or indoors, and kept at a temperature of 0.5°C and a relative humidity of 50% to 60%.
The species of wet chestnut, ginkgo, apple, pepper, and eucalyptus are not easy to germinate in the following year due to their high standard moisture content, such as dry storage. 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 select a dry, well-drained site with 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, and mix the seeds and fine sand in a ratio of 13%. In the pit, fill in 10 centimeters from the pit, cover with sand, and put several straw handles in the pit for courage. The temperature in the pit is kept at 0~3°C, and the moisture content of sand is kept at 70%~80%. Stacking can be done outdoors or indoors. The practice of indoor stacking is to select areas 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.
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