During the storage of corn seeds, a series of changes take place due to the effects of life activities and the damage of the worms and microorganisms, as well as environmental temperature and humidity. These changes should be carefully examined and unfavorable changes should be discovered in time to enable possible accidents. Eliminate in time.
First, check the seed temperature
The change of seed temperature during storage of corn seed is the first indicator of the safety status. Generally used "regular, fixed layer, fixed-point, timing" four set of inspection methods. Regular inspections are conducted according to seed conditions, seasons, and deadlines. Settling layer, the bulk seeds in the warehouse should be checked on the upper, middle and lower layers of the seed pile. The upper layer is 0.5 meters away from the surface of the pile, the lower layer is 0.5 meters away from the bottom of the pile, and the middle layer is between the upper and lower layers. Spot checks. Fixed point, fixed in the four corners of each floor and the central five points for the determination; bag yards should be stratified inspection. At regular intervals, conduct inspections within the prescribed period. The number and period of temperature measurement should be based on the seed moisture content and season. In summer and autumn, once every 3 days; when the seed moisture content is above 15%, once a day. In winter, when the seed temperature is above 0°C, every 5-7 days, when the seed moisture content is above 15%, every 3 days; when the seed temperature is below 0°C, once every 15 days, the seed moisture content is 15%. Above, once every 7 days. In spring, when the seed temperature is 5°C—10°C, once in 5 days, when the seed moisture content is more than 15%, every 3 days; when the seed temperature is 10°C or more, every 3 days; when the seed moisture content is more than 15%, once a day .
Second, the check of seed moisture content
The change of moisture content during storage of corn seeds is the second indicator of seed security status and it is closely related to temperature changes. Therefore, the seed moisture check cycle depends on the change in seed temperature. When the seed temperature is below 0°C, check once a month, 0-20°C, once every half month, once every 10 days above 20°C, once daily above 30°C. The inspection method is sampling at 5:15 on the third floor and measuring after mixing.
Third, check the seed germination rate
The change of germination rate during storage of corn seeds reflects the quality of seed storage. If the germination rate drops rapidly, the reasons should be ascertained and resolved in time. When the seed germination rate is normal, it should be checked once every 3 months. The last time should be before and after the seed is released for 10 days. If the seed temperature and moisture content are not stable, the number of inspections shall be increased according to the circumstances.
IV. Inspection of pests in seed warehouses
The cycle of the inspection of the worms should be determined according to the moisture, temperature, and season of the seeds during storage. At the same time, the larvae should be replenished and examined in the places where the worms are often dense, based on the habits, habitats, and development stages of the worms. Every 3-5 days in summer and 5-10 days in spring. The inspection is not a goal, but it is to accurately grasp the state and changes of the corn seed storage period. To find out the problems, find out the reasons in a timely manner and take measures to ensure the safety of the seeds.
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