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Weathered coal can extend seed storage life
When scallion, onion, and leek seeds are stored at room temperature for a year, their germination rate often drops below 50%. To extend the storage life of these vegetable seeds, an effective method involves using weathered coal as a moisture absorber. This technique has proven highly successful—onion seeds stored for three years retained an impressive germination rate of 86%, and even after five years, the rate remained above 70%.
The process is simple yet precise. First, the seeds harvested in the same year must be carefully selected to remove any pods or impurities. They should then be fully dried to reduce moisture content to around 10%, which is crucial for long-term preservation.
Next, the weathered coal needs to be processed. It should be crushed through a fine sieve and then fried in an iron pan until completely dry. Once cooled to about 30°C, it’s ready to mix with the seeds. The ratio of weathered coal to seeds is typically three parts coal to one part seeds.
Once mixed, the seeds are immediately placed into high-density polyethylene bags or containers, sealed tightly, and stored in a dry, dark place. If you need to access the seeds during storage, make sure to reseal the container properly. When sowing, the weathered coal can be planted along with the seeds, and it also helps promote healthy seedling growth by maintaining optimal moisture levels.
This method not only extends the shelf life of the seeds but also ensures better germination and stronger plant development. It's a practical and cost-effective solution for gardeners and farmers looking to preserve their seed stock for longer periods.
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Weathered coal can extend seed storage life