Three methods of safety control before sowing of newly purchased seeds

First, closing doors and windows in spring is the season when cold and warm air currents collide with each other, often due to a sudden drop in external temperature, resulting in condensation on the surface of the seed pile, that is, the seed surface is very wet, absorbs a lot of water vapor, and gradually condenses into tiny water droplets. Seed dew often leads to seed heat, mildew and loss. Therefore, when the cold wave comes, the doors and windows of the warehouse should be sealed to prevent the temperature in the warehouse from dropping suddenly.

Second, the temperature of killing pests gradually warms up in spring, and all kinds of pests begin to move, threatening the safety of seed storage. Therefore, insecticides should be used to spread insect repellent lines around the warehouse to reduce the invasion of pests into the warehouse. The stored seeds must also be checked frequently, and the inspection should be carried out by using the method of zoning fixed-point sampling, that is, the seeds are divided into upper, middle and lower layers, with 5 points in each layer, with a total of 15 points, and then sifted with a small hand sieve with a diameter of about 30 cm. Generally, the pest density (head number / kg) is calculated after 3 minutes of sieving. Most of the beetle pests are pseudo-dead, so they can be caught, put in the palm of the hand or take a breath of heat, and the pests will crawl. Once signs of harm are found, treatments such as exposure, freezing, wind screening or chemical fumigation should be taken immediately.

Third, the climate gradually warms up in spring, and the ground begins to thaw and return to moisture. The seeds near the ground, walls and column feet are easy to absorb moisture and return to moisture and cause heat and mildew of the seeds. Generally, isolation measures should be taken to cushion the seeds with planks and other materials about 50 cm high, and the seeds and walls and column feet should also be kept at a distance of more than 50 cm to prevent the seeds from absorbing moisture and returning to moisture. The water content of seeds should be checked frequently. If problems are found, measures such as ventilation and drying should be taken.