Cut vines After the harvest of sweet potatoes in the fall, choose a frost-free, disease-free and robust potato vine, remove the leaves, and retain 1 cm of petioles, cut every two sections.

Forced dormancy The cut potato vines were immersed in a 0.5% solution of amphiline (available at the chemical reagent store) for two minutes and then removed to dry the surface moisture.

Screening sand The ordinary yellow sand is filtered with a sieve to remove large particles and impurities, and water is sprayed until the humidity is held in the sand and released.

The sand pit is first digging on the ground, and its length and width are not limited, and its depth is 0.5 meters. Then the cane is laid flat in the pit using a layer of vine and a layer of sand, leaving a gap of 1 cm between the vines. The thickness of each layer of sand is not less than 3 cm, and the thickness of the top layer of sand is not less than 15 cm. In areas where the surface is covered with plastic film and frost is heavy, the film is covered with straw or straw. In the spring of the next year, when the sweet potatoes are planted, the potato vines can be inserted.

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