The trench method involves digging storage trenches on open, flat, and dry land. This technique is commonly used for preserving cabbage during the winter months. The key factors in this process include the depth of the trench, the timing of digging, the thickness of the soil cover, and the way the cabbage is arranged. The depth of the trench depends on the local permafrost layer and whether it's intended for long-term winter storage. It's best to dig the trench when the plants have 2 to 3 leaves that are slightly frozen—ideally just before or after a light snowfall.
The soil covering should be about 0.5 meters thick to provide sufficient insulation. When selecting a site, choose an area with clay-like soil, low groundwater levels, and good drainage. It’s also beneficial to dig trenches in areas with easy access for transportation. Trenches can be dug in a north-south direction, typically 1.5 meters wide and 0.25 meters deep, with the length adjusted based on the terrain and storage needs.
After digging, the excavated soil is used to build a mound around the trench, about 0.7 meters high. The depth of the trench and the height of the soil should match the height of the cabbage to ensure proper coverage. Before placing the cabbage in the trench, a layer of straw or dried leaves is placed at the bottom to prevent moisture damage. The cabbage is then carefully laid into the trench, packed tightly to minimize air gaps. Another layer of straw or leaves is added on top of the cabbage, followed by a final layer of soil, approximately 0.5 to 0.7 meters thick.
This method helps protect the cabbage from freezing temperatures and ensures it remains fresh throughout the winter. It's important to avoid digging during the coldest periods, as this could risk damaging the crops. With proper planning and execution, the trench method offers a reliable and effective way to store cabbage for extended periods.
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