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Weathered coal can extend seed storage life
When storing the seeds of scallions, onions, leeks, and similar vegetables at room temperature, their germination rate often drops below 50% by the following year. To extend the storage life of these 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 86% germination rate, and even after five years, the rate remained above 70%.
The process is straightforward yet precise. First, collect the seeds from the current year and carefully sort them to remove any pods, debris, or damaged seeds. Ensure they are fully dried so that the moisture content is reduced to around 10%, which is crucial for long-term preservation.
Next, take weathered coal and crush it through a fine sieve. Spread it in an iron pan and heat it gently until it is completely dry. Allow it to cool down to about 30°C before mixing it with the seeds. The ratio of weathered coal to seeds should be approximately 3:1. Once mixed, immediately place the seeds into high-density polyethylene bags or containers, seal them tightly, and store them in a cool, dark, and dry location.
If you need to access the seeds during storage, make sure to reseal the container promptly to maintain the low humidity environment. When sowing, the weathered coal can be planted along with the seeds. Not only does this help retain moisture, but it also supports healthier seedling growth and stronger plant development.
This method offers a practical and cost-effective way to preserve vegetable seeds for extended periods, making it especially useful for gardeners and small-scale farmers looking to save money and improve sustainability.
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Weathered coal can extend seed storage life