Chengde City counties are located in the deep mountains in the mid-latitudes, with a cold climate and a long winter. The unique natural and geographical conditions are very suitable for the breeding of seeds. Many counties have become breeding seed base counties. The seeds mentioned here refer to grains, cores, and yams. All types of seeds not only meet the needs of the counties in this city, but also have a large number of seeds sold domestically and abroad. However, pests and diseases have always been the natural enemy of seed storage. Here, ground temperature refers to the use of natural low temperatures to eliminate pests and diseases when the minimum temperature generally falls below -10 degrees Celsius and the extreme minimum temperature sometimes reaches 20 degrees after nine days of solar terms. Through experiments, after the frozen seeds, pests and diseases can eliminate more than 90%. The specific methods are as follows: 1. When the seeds are harvested, do not rush to the warehouse. After the drying for a period of time, if the moisture content is below 70%, store them again. 2. When the average temperature is below 0 degrees and the temperature is stable below 0 degrees, move the seeds out of the warehouse and use the cement square to tile 20 centimeters thick and stir 3 times a day. After 72 hours of freezing, you can re-stock. 3. When there is snow, tile 20 centimeters on the square, and use a wood-milling shovel to spade out the hoe type, temporarily erect the roof with a strong plastic cloth, and the height of the awning can be 40--50 centimeters high. In case of strong winds, the cold air can flow. Fourth, the tree species can be placed in a woven bag that is ventilated. Put it in a place where it is not visible for a long time. The bag is best separated from the bag by wooden sticks and strips. When the air is circulated, and it is frozen for a long time, it can achieve the purpose of killing insects.
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