Crop seeds generally have a post-harvest effect, especially in spring sowing, which takes a long winter. If it is stored for a period of time without sun exposure, the seeds will not be exposed to moisture released during the ripening process, and the seeds will be exposed to moisture and mold will directly affect their vitality. Therefore, when the crop seeds are stored in winter, they should be sunny in the sun every 30-35 days. In this way, not only can the seed's water content be reduced, the seed coat's permeability and water permeability properties can be improved, and the sun's ultraviolet rays can disinfect and kill all pathogenic bacteria and reduce the occurrence of pests and diseases. In particular, on the day when it is nearing sowing, by sowing seeds, the water in the soil will be quickly absorbed after sowing, swelling and sprouting, early emergence and increased seedling rate. So how do you turn seeds? Select air-drying sunny days, clean the field in the morning, after the scene of tan heat (usually after 10 o'clock in the morning), then spread the sun seeds, the thickness of about 3 cm is appropriate, spread into a wavy. After the stall is spread, it should be turned frequently so that it can be thoroughly sun dried. After 4 o'clock in the afternoon, the local area began to recede when it began to return to the tide. Due to the low winter temperatures, it is necessary to continuously dry for 2-3 days. The thick shell seeds must be continuously dried for 4-5 days. China Agricultural Network Editor