In the northeastern China, trenches are often used for freezing, and trenches are divided into active trenches and dead trenches. Generally, in the wind barrier, the greenhouse or the shady spot on the north side of the building, dig a trench that is 30 meters wide and 30 meters deep, 70 to 100 centimeters wide, and 30 to 70 centimeters deep. Divide 1 to 3 ventilation channels 20 to 25 cm wide and deep at the bottom of the ditch at the bottom of the ditch. Ventilation channels pass through both ends of the pit to the ground. Ventilation channels can be placed horizontally over the single layer. Straw stalks and store the parsley on top. For the winter parsley, the sowing date should be a few days later than when it is directly listed. The harvesting period should also be later. It is generally frozen on the ground in the morning and evening, and it is appropriate to harvest it when it is frozen at noon. The parsley was harvested and the yellow leaves were removed. 1 to 1.5 kg were bundled or sprinkled in the ditch. The roots were downward, and the leaves were covered with a layer of sandy soil or a layer of straw on the surface of the ditch. Afterwards, the temperature dropped. Add covers 2 to 3 times, with a total thickness of 20 to 25 cm. The cold season can be covered with grasshoppers, and the temperature in the ditch is maintained at -5 to -4°C to freeze the leaves of the parsley, and the roots are not frozen. This method can be stored until the end of February of the following year. thaw. Can't be impatient.
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