After the sweet potato harvest in the fall, select healthy and vigorous potato vines that are free from disease and frost damage. Remove the leaves, leaving about 1 cm of the petiole, and cut the vines into sections of two nodes each. This helps prepare them for the next stage of propagation.
To encourage dormancy, soak the cut potato vines in a 0.5% solution of amphiline (available at chemical supply stores) for two minutes. Afterward, remove the vines and allow them to dry slightly on a clean surface. This treatment helps delay growth and improves survival during storage.
For the sand bed, use ordinary yellow sand and sieve it to remove any large particles or impurities. Moisten the sand until it holds moisture but does not drip when squeezed. The sand should be damp enough to support the vines without being waterlogged.
Prepare a sand pit by digging a shallow trench on level ground—its length and width can vary depending on the quantity of vines, but the depth should be around 0.5 meters. Place the vines flat in the pit, alternating layers of vines and sand. Keep a 1 cm gap between each vine to allow proper air circulation. Each layer of sand should be at least 3 cm thick, and the top layer should be no less than 15 cm to protect the vines from temperature fluctuations.
In regions where frost is common, cover the sand pit with plastic film and add a layer of straw or mulch on top for extra insulation. By spring, when it's time to plant sweet potatoes, the stored vines can be easily retrieved and planted directly into the soil. This method ensures strong, healthy vines for the next growing season.
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