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Kiln storage carrots 4 points
Carrots in our province are about to be harvested, and during peak season, the market is flooded with supply, causing prices to drop and farmers' incomes to fall. To combat this, using kiln storage for off-season sales can significantly improve farmers' profits. Here's a detailed guide on how to properly implement this technique:
First, it's important to harvest at the right time. In central and southern Hebei Province, carrots typically take 100–130 days to mature. The best time to harvest is early November. Harvesting too early may reduce yield, while waiting too long increases the risk of frost damage.
Next, prepare the storage site by digging a kiln. In the North China Plain, the frozen soil layer is usually around 1 meter deep, so the kiln should be about 2 meters deep. Carrots stored too shallow are prone to freezing, while those stored too deep may get too hot. Choose a location that is dry, sheltered from the wind, has deep and compact soil, and a low groundwater level. Dig a pit measuring 3 meters long, 1.6 meters wide, and 2 meters deep. Smooth the walls and bottom of the pit. On one of the east or west walls, install a diagonal ventilation hole, making sure it doesn't reach the bottom to prevent cold air from damaging the carrots during ventilation. Create an entrance on the south or north side for easy access. Place wooden sticks or bamboo rafts on top of the kiln and cover them with corn stalks or rice straw, ensuring a 30-centimeter thick layer.
Then, start layering the carrots. First, spread a 10-centimeter layer of river sand at the bottom of the kiln. Then place the cleaned, disease-free carrots in layers, keeping each layer between 60–80 centimeters high. Cover each layer with a 10-centimeter layer of wet sand to maintain moisture and protect the carrots.
Temperature and humidity control are crucial for successful storage. The ideal temperature range for winter carrot storage is 0–1°C. If the temperature rises above 3°C, the carrots may sprout, and below -2°C, they risk freezing. As outside temperatures drop, gradually close the kiln door and ventilation holes. When the outside temperature falls below -10°C, cover the top of the kiln with corn stalks or straw for extra insulation. As spring approaches and temperatures rise, slowly remove the excess covering but leave some soil in place. Gradually open the ventilation holes to allow cooling. Keep the humidity of the sand between 70% and 80%, and if it becomes too dry, replace the dry sand with wet sand to maintain moisture levels.
Finally, adjust the sale schedule based on local market demand. With proper storage techniques, farmers can extend the shelf life of their carrots and maximize their profits throughout the year.